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DGPS MAX Reference Manual

7.6.8

VTG Data Message..............................................................................131

7.6.9

ZDA Data Message..............................................................................131

Troubleshooting.......................................................................................................133

Appendix A - Specifications.................................................................................................135

Appendix B - DGPS MAX Interface...................................................................................139

Appendix C – Activating the OmniSTAR DGPS Service..............................................143

Appendix D - Beacon Information .....................................................................................147

Appendix E - Post Processing .............................................................................................149

Further Reading......................................................................................................................151

Index .....................................................................................................................................153

Summary of Contents for DGPS MAX

Page 1: ...DGPS MAX Reference Manual Part Number 875 0034 001 Date March 2004 ...

Page 2: ...opy photograph digitizing or otherwise without the prior written permission from CSI Wireless Inc Trademarks The CSI Wireless logo and COAST are trademarks of CSI Wireless Inc All other trademarks are the property of their respective owners CSI Wireless Inc 4110 9th Street SE Calgary Alberta Canada T2G 3C4 Telephone number 1 403 259 3311 Fax number 1 403 259 8866 E mail address info csi wireless c...

Page 3: ...r warranties In no event shall CSI Wireless be liable for direct indirect incidental collateral or consequential damages of any kind including but not limited to damages resulting from installation or use quality performance or accuracy of CSI Wireless products This warranty provides you with your exclusive remedies for any breach in warranty Purchaser s Exclusive Remedy The purchaser s exclusive ...

Page 4: ...less does not warrant or guarantee the precision or accuracy of positions obtained when using CSI Wireless products Product accuracy as stated in CSI Wireless literature and or product specifications serves to provide only an estimate of achievable accuracy based on n Specifications provided by the US Department of Defense US DoD for GPS Positioning n GPS OEM Receiver specifications of the appropr...

Page 5: ...gs xix 1 Introduction 1 1 1 GPS 1 1 1 1 How it Works 1 1 1 2 GPS Services 2 1 2 Differential GPS 2 1 2 1 How it Works 2 1 2 2 Real Time DGPS 3 1 3 DGPS Format 3 1 4 Factors Affecting Positioning Accuracy 4 1 5 DGPS MAX DGPS Services 6 1 5 1 Wide Area Augmentation System WAAS 6 1 5 2 OmniSTAR Worldwide DGPS Service 12 1 5 3 Radiobeacon DGPS 15 1 6 DGPS Service Comparison 18 1 7 DGPS MAX Receiver In...

Page 6: ...MAX 26 2 3 6 Connecting the DGPS MAX To External Devices 27 2 4 Installing the CDA 2MAX Antenna 29 2 4 1 Antenna Placement To Optimize Beacon Reception 30 2 4 2 Antenna Installation 1 14 UNS Threaded Mount 30 2 4 3 Antenna Installation Surface Mount 31 2 4 4 Routing and Securing the Antenna Cable 32 2 4 5 Connecting the CDA 2MAX Antenna 33 2 5 Mounting Accessories 33 2 5 1 Magnetic Mount 33 2 5 2 ...

Page 7: ...MAX Architecture 43 4 1 Hardware 43 4 2 Firmware 44 4 3 Applications 44 5 Operation 45 5 1 Front Display and Keypad 45 5 2 Navigating the Menu System 45 5 3 Menu Access Icon 46 5 4 Receiver Status Icons 46 5 4 1 Position Fix Status Icon 46 5 4 2 WAAS Lock Icon 47 5 4 3 OmniSTAR Lock Icon 48 5 4 4 Beacon Lock Icon 49 5 4 5 External DGPS Correction Source Icon 49 5 4 6 Autonomous Mode Icon 50 5 5 DG...

Page 8: ... Menu 75 5 10 WAAS Menu 81 5 10 1 WAAS Signal Status Menu 82 5 10 2 WAAS Configure Menu 85 5 11 OmniSTAR Menu 85 5 11 1 OmniSTAR Signal Status Menu 86 5 11 2 OmniSTAR Configure Menu 92 5 12 Beacon Menu 96 5 12 1 Beacon Signal Status Menu 97 5 12 2 Beacon Configure Menu 101 5 13 External RTCM Menu 103 5 14 Autonomous Menu 105 5 15 System Setup Menu 106 5 15 1 Display Applications Menu 108 5 15 2 Di...

Page 9: ...ard After Start up 119 6 3 Selecting a Previously Saved Configuration 120 6 4 Bypassing a Configuration Step 120 6 5 Completing the Step by Step Process 120 6 6 Saving a Configuration 121 7 NMEA 0183 Messages 123 7 1 Description of NMEA 0183 123 7 2 NMEA Message Elements 123 7 3 DGPS MAX Serial Port Configuration 124 7 4 SLXMon 124 7 5 PocketMAX 124 7 6 GPS NMEA Data Messages 125 7 6 1 GGA Data Me...

Page 10: ... 6 9 ZDA Data Message 131 8 Troubleshooting 133 Appendix A Specifications 135 Appendix B DGPS MAX Interface 139 Appendix C Activating the OmniSTAR DGPS Service 143 Appendix D Beacon Information 147 Appendix E Post Processing 149 Further Reading 151 Index 153 ...

Page 11: ...S MAX Socket Connector Pin Numbering 28 Figure 2 3 DGPS MAX Interface 29 Figure 5 1 DGPS MAX Display and Keypad 45 Figure 5 2 Menu Access Icon 46 Figure 5 3 GPS Position Fix Icon 47 Figure 5 4 WAAS Lock Icon 48 Figure 5 5 L band Lock Icon 48 Figure 5 6 Beacon Lock Icon 49 Figure 5 7 External DGPS Source Icon 50 Figure 5 8 Autonomous Mode Icon 50 Figure 5 9 GPS Menu 51 Figure 5 10 WAAS Menu 52 Figu...

Page 12: ...rence Manual xii Figure 6 1 Configuration Wizard Menu 118 Figure B 1 GPS Data Interface 140 Figure B 2 RTCM Data Interface 141 Figure B 3 External Correction Source Interface 142 Figure C 1 OmniSTAR Coverage Map 145 ...

Page 13: ...us Values 101 Table 7 1 NMEA Message Elements 124 Table 7 2 GPS NMEA Messages 125 Table 7 3 GGA Data Message Defined 126 Table 7 4 GLL Data Message Defined 127 Table 7 5 GSA Data Message Defined 127 Table 7 6 GSA Data Message Defined 128 Table 7 7 GSV Data Message Defined 129 Table 7 8 RMC Data Message Defined 130 Table 7 9 RMC Data Message Defined 130 Table 7 10 VTG Data Message Defined 131 Table...

Page 14: ...DGPS MAX Reference Manual xiv ...

Page 15: ...igh performance DGPS beacon receiver You may use any of the three internal differential correction services depending which service is available The beacon receiver obtains free DGPS beacon signals where available the WAAS demodulator decodes correction data from the Wide Area Augmentation System and the L band satellite differential receiver obtains corrections from the OmniSTAR Worldwide DGPS se...

Page 16: ...tion of the DGPS MAX Chapter 5 Operation describes how to configure and operate the DGPS MAX receiver using the keypad driven menu system This Chapter also provides a detailed listing of the default parameters Chapter 6 Configuration Wizard introduces the Configuration Wizard feature and describes how it may be used to simplify configuration of the DGPS MAX receiver Chapter 7 NMEA 0183 Messages de...

Page 17: ...f GPS DGPS sources for further information The Index provides a listing of the locations of various subjects within this manual Customer Service If you encounter problems during the installation or operation of this product or cannot find the information you need please contact your dealer or CSI Wireless Customer Service The contact numbers and e mail address for CSI Wireless Customer Service are...

Page 18: ...you are returning a product for repair you must also provide a fault description before CSI Wireless will issue an RMA number When providing the RMA number CSI Wireless will provide you with shipping instructions to assist you in returning the equipment World Wide Web Site CSI Wireless maintains a World Wide Web home page at the following address www csi wireless com A corporate profile product in...

Page 19: ...eypad This icon indicates that you should press the down arrow button of the receiver keypad Notes Cautions and Warnings Notes Cautions and Warnings stress important information regarding the installation configuration and operation of the DGPS MAX combination GPS L band Beacon receiver Note Notes outline important information of a general nature Cautions Cautions inform of possible sources of dif...

Page 20: ...DGPS MAX Reference Manual xx ...

Page 21: ...z frequencies that allows user equipment to calculate a range to each satellite GPS is essentially a timing system ranges are calculated by timing how long it takes for the GPS signal to reach the user s GPS antenna To calculate a geographic position the GPS receiver uses a complex algorithm incorporating satellite coordinates and ranges to each satellite Reception of any four or more of these sig...

Page 22: ...ally turned off Currently autonomous GPS is able to provide accuracy on the order of 10 meters depending on the sophistication of the GPS engine For many positioning and navigation applications this level of accuracy is not sufficient and differential techniques must be employed 1 2 Differential GPS The purpose of differential GPS DGPS is to remove the effects of SA atmospheric errors timing error...

Page 23: ...o technical constraints on their use 1 3 DGPS Format For manufacturers of GPS equipment commonality is essential to maximize the utility and compatibility of a product The governing standard associated with GPS is the Interface Control Document ICD GPS 200 maintained by the US DoD This document provides the message and signal structure information required to access GPS Like GPS DGPS data and broa...

Page 24: ...the base station differ somewhat from those at the remote user s location This spatial decorrelation of errors can result in a relative position offset from the absolute coordinates of the remote receiver This offset may be as much as one meter for every 100 km 62 miles between the base station and remote receiver The WAAS and OmniSTAR services are not as susceptible to this error as it they use a...

Page 25: ...on and remote receivers WAAS models the state of the ionosphere providing Ionospheric errors are minimized by the Virtual Base Station process of the OmniSTAR systems by utilizing a wide are data format The number of satellites visible and their geometry in the sky influences positioning accuracy The Dilution of Precision DOP describes the strength of location and number of satellites in view of t...

Page 26: ...cribes the signal and data content of all three DGPS services available for use with the DGPS MAX receiver 1 5 1 Wide Area Augmentation System WAAS The US Federal Aviation Administration is in the process of developing a Wide Area Augmentation System WAAS for the purpose of providing accurate positioning to the aviation industry In addition to providing a high quality accurate service for this ind...

Page 27: ...lable its use is at your risk and discretion EGNOS is not currently broadcasting with any form of certification and its use is at your risk and discretion 1 5 1 1 WAAS DGPS WAAS differential and other compatible SBAS use a state based approach in their software architecture These services take in reference data from a network of base stations and endeavor to model the sources of error directly rat...

Page 28: ...ly important in Canada for regions north of approximately 54 N latitude and east of 110 W longitude Please note that the process of estimating ionospheric corrections beyond the WAAS broadcast map would not be as good as having an extended WAAS map in the first place This difference may lead to minor accuracy degradation Figures 1 1 and 1 2 depict the broadcast WAAS ionospheric map extent and the ...

Page 29: ...GPS is that only one antenna element is required In the case of the CDA 2MAX antenna a second antenna element is required internally for the beacon sensor within the DGPS MAX receiver Further the internal GPS WAAS antenna has been designed for reception of OmniSTAR signals which also broadcast in the L band More about the CDA 2MAX antenna is provided in Section 1 8 1 5 1 3 WAAS Reception Since WAA...

Page 30: ...s This figure approximates the coverage of these satellites by depicting coverage within the white shaded region Within the white shaded coverage area at least one of the two satellites is available by line of sight Within the overlap area both satellites may be accessible Please note that signal coverage may be present in some areas without either sufficient ionospheric map coverage or satellites...

Page 31: ...DGPS MAX Reference Manual 11 Figure 1 3 WAAS Coverage ...

Page 32: ...R is a worldwide terrestrial DGPS service that provides correction data to subscribers of the system with the use of a geostationary transponder 1 5 2 1 OmniSTAR DGPS OmniSTAR is a wide area DGPS service The information broadcast by this service is based upon a network of reference stations placed at ...

Page 33: ... RTCM SC 104 message Type 1 The L band DGPS receiver within the DGPS MAX interpolates corrections from the wide area signal specific to your location using Virtual Base Station VBS processing algorithms The resulting RTCM corrections are those that would be calculated if a reference station were set up at your present location This type of solution ensures a consistent level of accuracy across the...

Page 34: ...ion angle to these satellites is dependent upon latitude For latitudes higher than approximately 55 North or South the OmniSTAR signal may be blocked more easily by obstructions such as trees buildings terrain or other objects 1 5 2 4 OmniSTAR Coverage Figure 1 5 shows approximate OmniSTAR service coverage Regions without coverage or with poor coverage are shown with dark shading Please note that ...

Page 35: ...ility of these networks for terrestrial applications there is an increasing trend towards densification of these networks inland 1 5 3 1 Radiobeacon Range The broadcasting range of a 300 kHz beacon is dependent upon a number of factors including transmission power free space loss ionospheric state surface conductivity ambient noise and atmospheric losses The strength of a signal decreases with dis...

Page 36: ...he ground wave portion of the signal propagates along the surface of the earth losing strength due to spreading loss atmospheric refraction and diffraction and attenuation by the surface over which it travels dependent upon conductivity The portion of the beacon signal broadcast skywards is known as the sky wave Depending on its reflectance the sky wave may bounce off the ionosphere and back to Ea...

Page 37: ...enerated by this type of equipment can mask the beacon signal reducing or impairing reception Section 2 4 1 presents an effective procedure to minimize impact of local noise on beacon reception when using this correction service 1 5 3 3 Radiobeacon Coverage Figure 1 6 shows the approximate radiobeacon coverage throughout the world In this figure light shaded regions note current coverage with beac...

Page 38: ...d beacon are available Beacon signals are not affected by a line of sight In situations where there are tall obstacles that may block the line of sight DGPS signal both WAAS and OmniSTAR such as buildings or trees a beacon signal may be more desirable However the value of our new COAST technology discussed in Section 1 8 is that outages of the DGPS signal are less of an influence on reception This...

Page 39: ...S and beacon services are free so it s possible to use both for a period of time to determine which satisfies your needs best Once this has been determined it s a good idea to continue using one of the two services from then on and not switch from between the services frequently This will help to ensure consistent positioning from day to day For information relating to locations of DGPS beacons pl...

Page 40: ...d differential satellite receiver features an auto scanning mode where it will reacquire a valid signal if the current one becomes unavailable The L band DGPS receiver generates Virtual Base Station GPS corrections by localizing the wide area data using position input from the GPS receiver inside the DGPS MAX The beacon receiver embedded within the DGPS MAX is CSI Wireless s SBX dual channel minim...

Page 41: ...nna supplied with the DGPS MAX provides radio frequency signals to all three internal receivers Inside the CDA 2MAX s enclosure are an L band antenna for reception of GPS WAAS and L band satellite signals and an H field beacon loop antenna for reception of beacon signals Both of these antenna elements are active and draw their power from the DGPS MAX receiver The CDA 2MAX outputs all three signals...

Page 42: ... frequency radiobeacon broadcast It receives beacon signals that are band pass filtered and amplified This ensures that only radiobeacon frequencies to passed to the beacon receiver Appendix A details the technical specifications for the CDA 2MAX antenna Refer to Section 2 4 for instructions regarding antenna installation ...

Page 43: ... xxx n Power Cable various available n Antenna Cable various available n Data Cable part number 050 0011 022 n Magnetic Mount Kit part number 725 0007 012 n Reference Manual part number 875 0034 000 2 2 Receiver Layout and Connections The DGPS MAX receiver is easily installed requiring only power data antenna and ground connections Figure 2 1 illustrates the cable connections required for the DGPS...

Page 44: ... follow the guidelines presented in the following sections 2 3 1 Receiver Placement The flange mounting bracket supplied with the DGPS MAX is used to secure the receiver to the selected mounting surface You may install this bracket on the top or the bottom of the DGPS MAX Use the mounting brackets as a template when planning and drilling mounting holes ...

Page 45: ...the temperature remains between 32 C and 74 C and relative humidity is less than 95 non condensing The receiver may be stored between 40 C and 85 C The CDA 2MAX Antenna is designed to operate in an open environment in which the temperature remains between 40 C and 85 C and relative humidity is as high as 100 The antenna may be stored at temperatures between 40 C and 85 C 2 3 3 Power Considerations...

Page 46: ...y pressing the ON OFF switch located on the rear panel You may press the On Off switch one more time to turn the receiver off This will save you from having to disconnect the power cable from the receiver The DGPS MAX receiver incorporates reverse polarity protection to prevent damage if the power leads are accidentally reversed A 1 5 A slow blow fuse or 2 5 A standard blow situated in line of the...

Page 47: ...e port for differentially corrected GPS data The AUX port is a secondary port designed for input of external RTCM correction data In the case that an external differential source is required you may configure the DGPS MAX using the menu system to accept the external correction data through the AUX port Both data ports are located at the back panel of the DGPS MAX and are a DB9 socket connector Tab...

Page 48: ...d timing output HCMOS rising edge synch 10 kΩ 10 pF load Figure 2 2 displays the numbering scheme for a DB9 socket connector female as located on the rear panel of the DGPS MAX receiver The associated numbering for the plug connector male is a mirror reflection of scheme showed in this figure 1 2 3 4 6 7 9 5 8 Figure 2 2 DGPS MAX Socket Connector Pin Numbering Figure 2 3 illustrates the standard i...

Page 49: ...X Antenna The location chosen for installation of the CDA 2MAX antenna will influence the overall performance of the DGPS MAX receiver When installing the antenna n Choose a location with a clear unobstructed view of the sky This is important for GPS WAAS and OmniSTAR signal reception n Choose a location that is at least three feet away from all forms of transmitting antennas communications and el...

Page 50: ...ections mount the antenna as high as possible considering maintenance and accessibility In addition ensure that the antenna is lower than the highest metal object on the vessel n If a radar system is present mount the antenna outside the path of the radar beam Your beacon receiver calculates a Signal to Noise Ratio SNR measured in dB Decibels that indicates the receiver s performance The SNR is he...

Page 51: ... covered under warranty Caution Install the antenna only hand tight Damage resulting from over tightening the antenna is not covered by warranty 2 4 3 Antenna Installation Surface Mount The CDA 2MAX antenna comes with a PVC base pre installed for mounting on a 1 14 UNS threaded mount installed This base may be removed for surface mounting the CDA 2MAX if desired To mount the CDA 2MAX in this fashi...

Page 52: ...length or low loss cable please contact your CSI Wireless dealer or CSI Wireless Technical Support When choosing a route for the antenna extension cable n Avoid running cables in areas of excessive heat n Keep antenna cables away from corrosive chemicals n Do not run the extension cable through door or window jams n Keep the antenna cable away from rotating machinery n Do not bend excessively or c...

Page 53: ...ons 2 5 1 Magnetic Mount Included with a standard system the magnetic mount PN 725 0007 012 can be used to install the CDA 2MAX antenna on any ferrous surface including the roof of a vehicle It consists of a mounting extension two inches long attached to a circular metal disk housing a magnet A protective membrane covers the bottom of the mount protects the mounting surface from abrasion A three i...

Page 54: ...available for installation of the CDA 2MAX antenna It consists of a hollow threaded post on a circular base Three screws are required to secure this mount to a mounting surface CSI Wireless PN 604 0002 000 2 5 3 Survey Adapter The optional Survey Adapter is a threaded insert available for use with the CDA 2MAX antenna It converts the standard 1 14 UNS 2B thread to a 5 8th inch thread frequently us...

Page 55: ...nal and maintain an acquisition on the best station at all times Should a superior station become available as you navigate with your positioning system the beacon sensor will automatically acquire that station This chapter describes the various modes of operation and features of your DGPS MAX receiver and its internal sensors 3 1 GPS Operation The GPS engine is always operating regardless of the ...

Page 56: ...higher SNR is indicative of better quality signal reception SNR information is provided by the DGPS MAX via its menu system on a per channel basis numerically as well as presenting this information symbolically in a bar chart More about this feature is discussed in Sections 5 7 and 5 9 2 3 2 WAAS Operation The following sections describe the general operation and performance monitoring of the WAAS...

Page 57: ...lites if available in your region are presented in the menu system of the DGPS MAX The bit error rate has a default no lock value of 500 or more As the receiver begins to successfully acquire the signal it will result in a lower bit error rate For best operation this value should be less than 150 and ideally less than 20 Section 5 10 1 provides more information on the display of the BER A graphica...

Page 58: ...nd the satellite appears lower on the horizon The BER number indicates the number of unsuccessfully decoded symbols in a moving window of 2048 symbols Due to the use of forward error correction algorithms one symbol is composed of two bits The bit error rate has a default no lock value of 500 As the receiver begins to successfully acquire the signal it will result in a lower bit error rate For bes...

Page 59: ... MAX s internal beacon receiver uses its two independent beacon channels to identify and lock to DGPS beacons without interrupting the continuous flow of RTCM data to the GPS receiver ABS mode is ideal for navigation applications over considerable areas eliminating the need for operator intervention when transitioning from one beacon coverage zone to another When desired you may also tune the beac...

Page 60: ...ll automatically switch to this beacon No loss of lock occurs on the primary station during the background scan The DGPS MAX stores the current primary beacon in memory so that it is available upon subsequent power up You may force a new Global Search at any time using the display and keypad by selecting the Auto Tune menu item as discussed in Section 5 12 2 3 4 1 4 Manual Tracking In Manual tune ...

Page 61: ...g SNR Reception Description Approximate Data Throughput 25 Excellent 100 data throughput 20 to 25 Very Good 100 data throughput 15 to 20 Good Good data throughput up to 100 10 to 15 Stable Moderate to good data throughput 7 to 10 Intermittent Low data throughput 7 No Lock No data throughput A graphical presentation of the reception quality is provided in the signal tracking bar chart Refer to Sect...

Page 62: ...ort Settings Serial Port Baud Rate Data Bits Parity Stop Bit Interface Level MAIN 9600 8 None 1 RS 232C AUX 9600 8 None 1 RS 232C Table 3 4 Preset GPS NMEA Message Output GPS NMEA Messages Update Rate Max DGPS Age Elevation Mask GGA GSV VTG ZDA 1 Hz 1800 seconds 5 ...

Page 63: ... GPS n WAAS n OmniSTAR n Beacon 4 1 Hardware The SLX receiver inside the DGPS MAX drives the menu system and provides receiving capability for GPS WAAS and OmniSTAR This platform comprises the main portion of the DGPS MAX receiver The SLX is designed to process GPS and L band signals simultaneous using specific hardware and software A built in WAAS demodulator uses the same hardware as the GPS rec...

Page 64: ... incorporates its own version of firmware The firmware of the SBX may also be upgraded through the MAIN serial port 4 3 Applications The ARM of the SLX inside the DGPS MAX supports two simultaneous versions of firmware Only one of them is in operation at a given time These two versions of firmware may have different functionality and are also referred to as applications The DGPS MAX ships with two...

Page 65: ...6 character LCD and 3 button keypad The keypad is composed of an up arrow enter and down arrow key Figure 5 1 shows the display and keypad of the DGPS MAX receiver Figure 5 1 DGPS MAX Display and Keypad 5 2 Navigating the Menu System The keypad on the front of the DGPS MAX allows you to navigate through the intuitive menu system configuring operating parameters and viewing status information The t...

Page 66: ...the current item in focus by pressing the key Figure 5 2 Menu Access Icon 5 4 Receiver Status Icons The following sections describe the status icons of the DGPS MAX receiver The icons displayed by the DGPS MAX depend on the current operating mode of the receiver and its current lock status 5 4 1 Position Fix Status Icon The DGPS MAX provides an indication of the GPS lock status as contained within...

Page 67: ...or is a symbol representing a GPS satellite The third state denoted by the solid circle between the two parallel vertical lines indicates that the GPS receiver is computing differentially corrected position solutions 5 4 2 WAAS Lock Icon When the DGPS MAX is configured to use WAAS correction information The DGPS MAX receiver will display the lock status on at the far right of the top line of the d...

Page 68: ...r of the display The lock symbol illustrated in Figure 5 5 remains in the No L band DGPS Lock state until the receiver has acquired the DGPS satellite transmission at which point the symbol changes to the L band Lock icon The L band DGPS receiver will lock to the satellite signal although a valid subscription is not present within the receiver in order to provide the facility to subscribe the rece...

Page 69: ...igure 5 6 remains in the closed position when the DGPS MAX is locked to a valid beacon signal and open when no broadcast is available for the specified frequency and or MSK bit rate No Beacon Lock Beacon Lock Figure 5 6 Beacon Lock Icon Note When using beacon corrections the GPS output of the DGPS MAX will not be differentially corrected until the beacon receiver locks to a valid RTCM broadcast 5 ...

Page 70: ...r position and status information and change receiver configuration Figures 5 9 to 5 15 illustrate the various menus in the menu system The root or main menu contains main parent menus a GPS menu a differential menu a Configuration Wizard menu and a System Setup menu The GPS Configuration Wizard and System Setup menus remain the same regardless of the operating settings of the DGPS MAX receiver Ho...

Page 71: ... 37 AZ 092 SNR 45 CH12_SV09 EL 45 AZ 183 SNR 47 Back A A DSP CarLock YES DSP BER YES DSP DSPLock YES DSP FrmSync YES DSP TrkMode YES ARM GPSLock YES ARM DifData YES ARM ARMLock YES ARM DGPS YES ARM Solutn YES Back Top Menu A Car Smooth 11 Eph Exists 11 Eph Healthy 10 NotUsed Prev11 Above Ele 11 Diff Corr 10 No Diff Corr 0 Back Top Menu A Res rms 0 3m _a 0 2m _b 0 1m Azimuth 163 1 _Lat 0 2m _Lon 0 ...

Page 72: ...iSTAR Config Wizard System Setup Signal Status Configure Back Top Menu F 1551489 1200 BER 001 AA Difstatus LN _101 0 Elevation 31 6 Azimuth 163 4 Back Top Menu Diff OmniSTAR F 1551489 1200 AutoTune Subscription Back Top Menu Begin Date Expiry Date SerialNum Disp Countdown Tmr Back Top Menu Subscription OK Region OK Sat Link OK Maritime OK Remote Site OK Almanac OK Position OK Time OK Sat Update OK...

Page 73: ... 4 4 4 4 4 Beacon Table Ver C101_0 000 Tune Auto Auto Beacon Receiver Auto Scanning Africa Asia Australia Central America Europe North America South America Back Bermuda Canada U S A Back Alexandria VA Annette Is AK Youngstown NY Back Diff Beacon Figure 5 12 Beacon Menu GPS Extern RTCM Config Wizard System Setup External RTCM Diff Extrn RTCM RTCM In 9600 Back Top Menu Match External Baud rt to RTC...

Page 74: ...ftware Disp Back Top Menu A In Use WAAS Other OmniSTAR DispUpdate 5 Hz LL Unit DM M Hgt Unit meters Vel Unit km h Back Top Menu A NMEA I O 9600 RTCM In 9600 Back Top Menu A Menu System SLX DSP SLX ARM SBX Back Top Menu A Figure 5 15 Setup Menu 5 6 Start Up Sequence When you turn the DGPS MAX on it will sequence through a startup screen followed by a prompt asking if you d like to use the Configura...

Page 75: ...h bar the higher the bar the greater the signal quality The first portion of the chart denoted by the GPS icon indicates the GPS satellite receiving quality on a per channel basis The second portion denoted by the DGPS icon A or of the current mode of operation provides the signal tracking information for that correction source if appropriate If the external correction input or the autonomous mode...

Page 76: ...2 and the second for WAAS PRN 134 5 7 2 OmniSTAR Mode Bar Chart When operating the DGPS MAX receiver in OmniSTAR mode the portion of the bar chart to the right of the OmniSTAR mode indicator reflects OmniSTAR tracking performance The OmniSTAR bar chart will reflect the quality of the bit error rate BER for OmniSTAR signal reception A higher bar is indicative of a better BER A good BER is zero and ...

Page 77: ...nts an SS of 35 or greater and an SNR of 24 or greater SS and SNR values of zero will be displayed with minimum bar height and will be only 2 pixels tall Intermediate quality signals are shown with a bar height relative to the reception quality 1233213331 43 4444444444 44 In the case of Beacon there are two signal figures the SS and SNR reading The first bar indicates the SS value and the second t...

Page 78: ...splay the following menu when the boot sequence has been completed upon startup This is the top or Main menu GPS A WAAS Config Wizard System Setup Pressing the and keys allows you to scroll through the available menu items Pressing the button with any item in focus on the top line will take the menu system to that submenu GPS When this menu is accessed using the button the menu system displays the...

Page 79: ...re the DGPS MAX step by step This feature is described in detail in Chapter 6 System Setup When this menu is accessed the menu system will display the contents of the System Setup menu Inside this menu you ll have the ability to change baud rates view the current applications in memory customize the display parameters and monitor the versions of firmware installed in the DGPS MAX receiver 5 9 GPS ...

Page 80: ...ows you to monitor position related information such as latitude longitude altitude and time Other useful information is also presented in this menu Satellites When this menu item is accessed using the button the menu system will display the GPS satellite tracking status on a channel by channel basis Configure Entering this menu using the button will allow you to change various configuration param...

Page 81: ...ubmenus is detailed in Figure 5 9 51 00 131035A _114 00 273158 Hgt 1030 40m Hdg 187 3 t Vel 10 5 kph Time 11 32 45 2 Age 5 6 s SV Count 07 HDOP 1 3 Precision NavCnd ABBABB DSP_ARM 1B_1F Back Top Menu Pressing the and keys allows you to scroll through the available menu items Pressing the button anywhere in this menu will provide a bar chart of signal tracking information Pressing the button with t...

Page 82: ...tude measured to the phase center of the antenna is usually referenced to the WGS 84 ellipsoid however some DGPS services result in a position relating to the North American Datum 1983 NAD 83 This datum is essentially equivalent to this ellipsoid considering the level of accuracy of this product _114 00 273158 This menu item displays the current antenna longitude in degrees minutes decimal minutes...

Page 83: ...current antenna height in either meters or feet depending on the units selected See Section 4 6 7 The default unit is meters This information is parsed from the NMEA GPGGA message The altitude measured to the phase center of the antenna is usually referenced to the WGS 84 ellipsoid however some DGPS services result in a position relating to the North American Datum 1983 NAD 83 This datum is essent...

Page 84: ... 15 2 for further details on setting a UTC offset This information is parsed from the GPZDA NMEA message Age 5 6 s This item displays the current DGPS age of corrections in seconds This information is parsed from the GPGGA NMEA message SV Count 07 This item displays the current number of satellites being used by the GPS receiver in computing its position If this value is 4 or greater then the comp...

Page 85: ... Accessing this menu by pressing the button with this item in focus will provide access to estimated real time precision values of computed positions The contents of this menu are described in Section 5 8 1 1 NavCnd ABBABB This menu item displays satellite tracking information and is called the navigation condition Each character following the NavCnd prompt is the number of satellites that meet ce...

Page 86: ...ous menu Top Menu When accessed using the button this menu item returns the menu system to the main menu 5 9 1 1 Precision Menu The Precision menu provides information relating to the estimated real time precision of position computations Please note that these are not absolute accuracy estimates but only relative measures This menu is detailed in Figure 5 9 Res rms 0 3m A _a 0 2m _b 0 1m Azimuth ...

Page 87: ...tes the length of the semi major axis of the horizontal position s error ellipse to a confidence of one standard deviation _b 0 1m This menu item indicates the length of the semi minor axis of the horizontal position s error ellipse to a confidence of one standard deviation azimuth 163 1 This menu item indicates the azimuth of the semi major axis of the horizontal position s error ellipse _Lat 0 2...

Page 88: ...ite must have a healthy ephemeris be above the elevation cut off mask angle and have differential corrections This menu indicates how many satellites meet each of these criteria This menu is detailed in Figure 5 9 Car Smooth 9 Eph Exists 8 Eph Healthy 8 NotUsed Prev 9 Above Ele 9 Diff Corr 8 No Diff Corr 0 Back Top Menu Pressing the and keys allows you to scroll through the available menu items Pr...

Page 89: ...ts 8 This menu item shows how many satellites have a healthy ephemeris orbit information A satellite must have a healthy ephemeris in order to be added to the position solution Eph Healthy 8 This menu items displays the number of satellites that have an ephemeris and the ephemeris is deemed to be healthy If an ephemeris is not considered to be healthy that satellite will not be considered in the p...

Page 90: ...es the number of satellites that have valid differential correctors in use The number of correctors present will depend on the information broadcast by the differential service in use There will not be correction information for satellites tracked by the remote receiver but not the base station As a consequence these satellites are not used in the position calculation No Diff Corr 0 This menu item...

Page 91: ... YES ARM DGPS YES ARM Solutn YES Back Top Menu Pressing the and keys allows you to scroll through the available menu items Pressing the button anywhere in this menu will provide a bar chart of signal tracking information Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively DSP CarLock The DSP CarLock is a descripti...

Page 92: ... the CarLock Under normal operation this field should indicate YES ARM GPSLock This menu item provides the status of a GPS lock Four valid satellites must be acquired before a GPS lock may be indicated Under normal operation this field should indicate YES ARM DifData This menu item indicates if differential data is being successfully decoded by the GPS receiver Under normal operation this field sh...

Page 93: ...ion on a channel by channel basis This menu is detailed in Figure 5 9 CH01_SV23 EL 37 AZ 092 SNR 45 CH12_SV09 EL 45 AZ 183 SNR 47 Back Pressing the and keys allows you to scroll through the available GPS receiver channels numbered Ch01 through Ch12 Pressing the button with any item in focus that does not have the menu access indicator will display a signal tracking bar chart Pressing the button wi...

Page 94: ...ly East This information is parsed from the GPGSV NMEA message SNR xx This is the signal to noise ratio carrier to noise ratio of the GPS satellite signal per receiver channel of the internal GPS engine The value of the SNR per satellite depends on the gain of the antenna used length of coaxial cable elevation of the satellite and also if there are any minor obstructions between the satellite and ...

Page 95: ...scroll through the available options Pressing the button with any item in focus will take the menu system to that submenu Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively NMEA Output When accessed using the button this menu item will take the menu system of the DGPS MAX to the NMEA Output menu for configuration...

Page 96: ... allows you to adjust the offset needed to reference your local time rather than UTC time from 12 to 12 hours You may change the offset used by the receiver in the display of time using the and keys followed by pressing Back When accessed using the button this menu item returns the menu system to the previous menu Top Menu When accessed using the button this menu item returns the menu system to th...

Page 97: ...will take the menu system to that submenu Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively GPGGA 5 Hz This menu item allows you to toggle the output of the GPGGA message through the MAIN port of the DGPS MAX receiver To change the current update rate press the button followed by adjusting the rate using the or ...

Page 98: ... This menu item allows you to toggle the output of the GPGSA message through the MAIN port of the DGPS MAX receiver To change the current update rate press the button followed by adjusting the rate using the or key then press This message may be set for output at 1 Hz only GPGST Off This menu item allows you to toggle the output of the GPGST message through the MAIN port of the DGPS MAX receiver T...

Page 99: ...e rate using the or key then press This message may be set for output at 5 Hz 1 Hz 5 s updates or may be turned off GPRRE Off This menu item allows you to toggle the output of the GPRRE message through the MAIN port of the DGPS MAX receiver To change the current update rate press the button followed by adjusting the rate using the or key then press This message may be set for output at 1 Hz only G...

Page 100: ...justing the rate using the or key then press This message may be set for output at 1 Hz only Bin96 Off This menu item allows you to toggle the output of the Binary 96 message contains raw measurement data through the MAIN port of the DGPS MAX receiver To change the current update rate press the button followed by adjusting the rate using the or key then press This message may be set for output at ...

Page 101: ...tellite symbol as shown in Figure 5 4 when using corrections from the internal WAAS receiver This portion of the menu system including submenus is detailed in Figure 5 10 Signal Status A Configure Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any item in focus will take the menu system to that submenu Pressing the button with the Ba...

Page 102: ... the button this menu item returns the menu system to the main menu 5 10 1 WAAS Signal Status Menu This menu provides various information regarding the status and operation of the WAAS demodulator This portion of the menu system including submenus is detailed in Figure 5 10 BER 122 0 A BER 134 9 LN 122 _54 0 LN 134 178 0 Elev122 9 8 Elev134 5 0 Az 122 114 0 Az 134 252 6 Back Top Menu Pressing the ...

Page 103: ...BER 134 0 This menu item displays the bit error rate of PRN 134 POR Pacific Ocean Region WAAS satellite signal The bit error rate as discussed in Section 3 3 2 is an indication of the signal acquisition quality Good reception is characterized by a rate of less than 20 a tolerable rate is less than 150 and a no lock condition is 500 or greater LN 122 _54 0 This menu item provides the longitude of t...

Page 104: ...ngle referenced to the horizon of the PRN 134 POR Pacific Ocean Region WAAS satellite This value is dependent upon your latitude and longitude in relation to the satellite s longitude and the equator Increasing distance from the equator will result in the satellite appearing lower on the horizon Az 122 114 0 This menu item provides you with the current azimuth referenced to North of the PRN 122 AO...

Page 105: ...s menu Top Menu When accessed using the button this menu item returns the menu system to the main menu 5 10 2 WAAS Configure Menu This menu allows you to change from the current WAAS mode to a different DGPS mode This portion of the menu system is detailed in Figure 5 10 Diff WAAS Pressing the and keys allows you to scroll through the differential options Pressing the button will change to the spe...

Page 106: ...stem to that submenu Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively Signal Status Accessing this submenu by pressing the button with this item in focus allows you to monitor signal status information from the internal OmniSTAR DGPS receiver Configure When in focus accessing this menu using button allows you t...

Page 107: ... submenus is detailed in Figure 5 11 F 1551489 1200 BER 001 AA Difstatus LN _101 0 Elevation 31 6 Azimuth 163 4 Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any status information in focus will display the signal tracking bar chart Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous...

Page 108: ...cquisition quality Good reception is characterized by a rate of less than 20 a tolerable rate is less than 150 and a no lock condition is 500 Difstatus The differential status menu provides an indication of the status of the L band DGPS receiver This value is in hexadecimal however the submenu that may be accessed by pressing the button when this item is focus decodes this into more intuitive info...

Page 109: ...This menu item provides you with the current azimuth referenced to North of the OmniSTAR satellite The azimuth value depends on your current latitude and longitude in relation to the satellite s longitude If the satellite is directly South of your current location the satellite will have an azimuth of 180 If the satellite appears directly North of your current location it will have an azimuth of 0...

Page 110: ...atus information in focus will display the signal tracking bar chart Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively Subscription This menu item indicates if the current subscription is valid by displaying OK If a subscription is not currently present or has expired it will display BAD Region This menu item in...

Page 111: ... displays OK this menu item indicates that the remote site in use as part of the DGPS correction source is operating correctly If the site is not operating correctly the receiver will display BAD Almanac This menu item indicates if the almanac provided by the OmniSTAR services has been downloaded successfully If a valid almanac is present with the DGPS MAX it will display OK otherwise the receiver...

Page 112: ...e This menu item indicates if the current satellite update is correct If the current update is acceptable the DGPS MAX will display OK otherwise the receiver will display BAD Back When accessed using the button this menu item returns the menu system to the previous menu Top Menu When accessed using the button this menu item returns the menu system to the main menu 5 11 2 OmniSTAR Configure Menu Th...

Page 113: ...ptions include the internal WAAS OmniSTAR beacon autonomous or external corrections When using an external source be sure that the source is providing RTCM SC 104 compliant corrections and not a proprietary binary format F 1551489 1200 When accessed using the button you will be able to tune the OmniSTAR receiver manually A screen will confirm that you wish to proceed with the manual tune If you do...

Page 114: ...e Subscription menu where the subscription expiry date and serial numbers may be viewed Back When accessed using the button this menu item returns the menu system to the previous menu Top Menu When accessed using the button this menu item returns the menu system to the main menu 5 11 2 1 Subscription Menu When operating the DGPS MAX with an OmniSTAR subscription this menu provides information rela...

Page 115: ... accessed using the button this menu will provide you with the beginning date of your subscription Expiry Date When accessed using the button this menu will provide you with the expiry date for your subscription SerialNum Disp When accessed using the button this menu will provide you with the OmniSTAR unit number for your DGPS MAX OmniSTAR uses this number for subscription purposes Please have it ...

Page 116: ... be a padlock symbol as shown in Figure 5 6 when operating in beacon DGPS mode This portion of the menu system including submenus is detailed in Figure 5 12 Signal Status Configure Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any item in focus will take the menu system to that submenu Pressing the button with the Back or Top Menu i...

Page 117: ...nu This section of the menu tree provides access to information related to the status of the beacon receiver primary channel This submenu is detailed in Figure 5 12 F Auto Auto AA SS 54 SNR 26 MTP 100 Q 25 Unselected Bx ID 0001 H 01 Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any status information in focus will display the signal...

Page 118: ...of signal strength and signal quality however high signal strength may not translate into good reception if there is significant noise present The SNR value is more representative of signal quality The SNR is the height of the signal above the noise floor measured in decibels dB This value effectively describes the reception quality as a signal is louder if it is higher above the noise floor Inter...

Page 119: ... rapidly but the menu is updated at 1 Hz As such its value may not appear to update in an intuitive manner Each RTCM word is 30 bits in length For a 200 bps modulation rate assuming a 100 MTP approximately 7 words will be decoded per second resulting in quick changes of Q Unselected Bx This menu item provides the name of the beacon to which the receiver is tuned This field will display the beacon ...

Page 120: ...I Wireless s World Beacon Listing located on our Web site at www csi wireless com This menu item also provides the health of the transmitting beacon as included within all RTCM messages broadcast by the beacon Table 5 1 defines the range and interpretations of health values Please note that the RTCM specification leaves the definition of some states of the heath bit up to the service provider Plea...

Page 121: ...e Auto Auto Auto Tune TuneBeaconName Table Version Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any item in focus will take the menu system to that submenu Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively Diff Beacon Using the button this menu i...

Page 122: ...will instruct the internal beacon receiver to enter automatic tracking mode and perform a new Global Search erasing any previous search information TuneBeaconName When accessed using the button this menu item allows you to choose a beacon by name from an internal listing of beacons The beacon that you select is chosen initially from a listing of continents then by country and finally from a listin...

Page 123: ...o the focus line and have pressed the button the beacon receiver will manually tune to that beacon Africa Asia Australia Central America Europe North America South America Back Bermuda Canada U S A Back Alexandria VA Annette Is AK Youngstown NY Back 5 13 External RTCM Menu The following menu appears when accessing the DGPS menu when using correction supplied from an external source Please note tha...

Page 124: ...essing the button on this menu item will display the signal tracking bar chart Diff Extrn RTCM Accessing this menu item using the button allows you to choose the source of differential corrections Correction source options include the WAAS demodulator internal OmniSTAR receiver the internal beacon receiver the use of external corrections or autonomous operation When using an external source be sur...

Page 125: ...signal tracking bar chart Pressing the button on any item in focus with the menu access indicator will take the menu system to that submenu Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively No Diff Source When accessed using the button the signal tracking bar chart will be displayed Diff Autonomous Accessing thi...

Page 126: ...to DGPS MAX configuration menus This portion of the menu system including submenus is detailed in Figure 5 15 Display Apps A Display Format Baud Rates Software Disp Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any item in focus will take the menu system to that submenu Pressing the button with the Back or Top Menu item in focus wil...

Page 127: ... DGPS modes Display Format When accessed using the button this menu item provides a submenu that allows you to change the display properties including the update rate of the display and the units associated with on screen variables Baud Rates When accessed using the button this menu will provide access to the baud rates submenu where the speed of the external MAIN and AUX ports may be changed Soft...

Page 128: ... 2 Display Format Menu This menu provides access to DGPS MAX configuration information and sub menus This menu system is detailed in Figure 5 15 DispUpdate 5 HzA LL Unit DM M Hgt Unit meters Vel Unit km h Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any item in focus will take the menu system to that submenu Pressing the button wit...

Page 129: ...sing the button allows you to adjust the units used to display the latitude and longitude Three formats are available n Degrees minutes decimal minutes DM M n Degrees decimal degrees D D n Degrees minutes seconds DMS Hgt Unit meters Accessing this menu using the button allows you to adjust the height units used to display the antenna altitude Two formats are available meters and feet Vel Unit km h...

Page 130: ...em is detailed in Figure 5 15 NMEA I O 9600 A RTCM In 9600 Back Top Menu Pressing the and keys allows you to scroll through the available options Pressing the button with any item in focus will take the menu system to that submenu Pressing the button with the Back or Top Menu item in focus will take the menu system to the previous menu or the Main menu respectively NMEA I O 9600 A Accessing this u...

Page 131: ...us menu Top Menu When accessed using the button this menu item returns the menu system to the main menu 5 15 4 Software Display Menu This menu provides access to version of firmware installed within the DGPS MAX receiver There are four types of firmware described below This menu system is detailed in Figure 5 15 Menu System A SLX DSP SLX ARM SBX Back Top Menu Pressing the and keys allows you to sc...

Page 132: ...the SLX s DSP SLX ARM Accessing this menu item using the button will display the version of firmware for the ARM processor on the SLX SBX Accessing this menu item using the button will display the version of firmware for the SBX beacon receiver Back When accessed using the button this menu item returns the menu system to the previous menu Top Menu When accessed using the button this menu item retu...

Page 133: ...cus and press n If required press to move the Diff menu item into focus and press n Select the desired differential correction source WAAS OmniSTAR beacon Extern RTCM or Autonomous using the or keys and press 5 16 2 Changing the Output Data Messages To change data messages output by the DGPS MAX receiver n Using the or key move the GPS menu located in the root menu into focus and press n Press to ...

Page 134: ...hen in OmniSTAR DGPS mode to view the subscription status of the OmniSTAR engine inside the DGPS MAX receiver n Using the or key move the OmniSTAR menu located in the root menu into focus and press n Using the or key move the Configure menu into focus and press n Use the or key to move the Subscription menu into focus and press n Press to access the Expiry Date menu that provides the current expir...

Page 135: ...ss You may select a beacon within the 283 5 100 to Auto Auto range of values 5 16 5 2 Select a Beacon By Name To tune to a specific beacon by name n Using the or key move the Beacon menu located in the root menu into focus and press n Using the or key move the Configure menu into focus and press n Using the or key move the TuneBeaconName menu into focus and press n Scroll with the or keys until th...

Page 136: ... press n Using the or key move the Configure menu into focus and press n Use the or key to move the Tune menu into focus and press n Using the or keys adjust the frequency and MSK bit rate to read Auto Auto The first method erases any previous search information and performs a new Global Search The second method will resume from where the last automatic search algorithm left off 5 17 Firmware Upda...

Page 137: ... the quickest method of configuring your receiver for different applications Additionally when a number of receivers are used for various operations in the field it s an advantage to have the same configurations in each To accomplish this it s possible to define the configurations either using the menu system or serial commands This ensures that each of the receivers can be set up with the same co...

Page 138: ...e and Exit Cancel Configure data messages No Configure baud rates No NMEA I O 9600 RTCM In 9600 Next Save and Exit Cancel Configure max DGPS age No MaxDGPSAge 2700 Finish Cancel Configuring DGPS Source Save Config in Wizd Table No Not Used 1 Not Used 2 Not Used 3 Not Used 4 Not Used 5 Return Exit Wizard MY CONFIG Configuring Receiver Diff OmniSTAR Yes No Yes No No Yes No Yes Yes My Config Not Used...

Page 139: ...e comfortable with the current settings that follow n Use a previously saved configuration n Choose and tune if desired the DGPS source n Set the output data messages n Set the baud rates n Set the maximum DGPS age You may cancel the Wizard at any time without making any changes to your current configuration by selecting Cancel You may quit the Wizard early while saving the changes that you ve mad...

Page 140: ...eter mentioned You may choose No and go on to the next step thus bypassing the current step When bypassing the current step the parameter that was bypassed will remain unchanged from your current configuration For example if the DGPS MAX is operating in WAAS mode and during the Wizard step by step process you are prompted to choose the DGPS source if you are happy with the current WAAS mode select...

Page 141: ...adjust the current character using the or button followed by pressing the button The character choices are alphanumeric including only capitalized letters You do not need to enter all 14 characters To erase a character use the or button to locate the character and press the button To complete the new name of the configuration adjust the current character to and press the button Pressing the button...

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Page 143: ...ional Marine Electronics Association publishes updates to the NMEA 0183 message standard The latest NMEA 0183 standard is available through National Marine Electronics Association NMEA Executive Director P O Box 50040 Mobile Alabama 36605 USA Tel 205 473 1793 Fax 205 473 1669 7 2 NMEA Message Elements NMEA 0183 messages have a common structure consisting of a message header data fields and carriag...

Page 144: ... the DGPS MAX to be configured and monitored remotely A separate Programming Manual is available that goes into detail on how to use these extended commands Please contact CSI Wireless for further information on programming the DGPS MAX through its serial port 7 4 SLXMon CSI Wireless offers a configuration utility for the SLX and SBX within the DGPS MAX receiver This utility runs on PC computers r...

Page 145: ...al Navigation Satellite System DOP and Active Satellites GPGST GNSS Pseudorange Error Statistics GPGSV GNSS Satellites in View GPRMC Recommended Minimum Specific GNSS Data GPRRE Range residual message GPVTG Course Over Ground and Ground Speed GPZDA Time and Date 7 6 1 GGA Data Message The GGA message contains detailed GPS position information and is the most frequently used NMEA data message In Ta...

Page 146: ...lly corrected position 9 position computed using almanac qq Number of satellites used in position computation pp p HDOP 0 0 to 9 9 saaaa aa Antenna altitude M Altitude units M meters xxxx xx Geoidal separation needs geoidal height option M Geoidal separation units M meters sss Age of differential corrections in seconds aaa Reference station identification cc Checksum CR LF Carriage return and line...

Page 147: ...resent in this message Null fields are present when data is unavailable due to the number of satellites tracked Table 7 5 breaks down the GSA message into its components This message has the following format GPGSA a b cc dd ee ff gg hh ii jj kk mm nn oo p p q q r r cc CR LF Table 7 5 GSA Data Message Defined Field Description a Satellite acquisition mode M manually forced to 2D or 3D A automatic s...

Page 148: ...udoranges and differential GNSS DGNSS corrections b b Standard deviation of semi major axis of error ellipse meters c c Standard deviation of semi minor axis of error ellipse meters d d Orientation of semi major axis of error ellipse meters e e Standard deviation of latitude error meteers f f Standard deviation of longitude error meters g g Standard deviation of altitude error meters cc Checksum C...

Page 149: ...vation in degrees ee 0 to 90 aaa Azimuth true in degrees aaa 0 to 359 ss SNR dB 30 ss 0 to 99 cc Checksum CR LF Carriage return and line feed 7 6 6 RMC Data Message The RMC message contains recommended minimum specific GPS data Table 7 8 breaks down the RMC data message into its components This message has the following format GPRMC hhmmss ss a ddmm mmm n dddmm mmm w z z y y ddm myy d d v cc CR LF...

Page 150: ...tion fix in day month year d d Magnetic Variation in degrees v Variation sense v E East v W West cc Checksum CR LF Carriage return and line feed 7 6 7 RRE Data Message The RRE message contains the satellite range residuals and estimated position error Table 7 9 breaks down the RRE data message into its components This message has the following format GPRRE n ii rr ii rr hhh h vvv v cc CR LF Table ...

Page 151: ...or c T always ttt Magnetic course over ground ttt 000 to 359 in degrees output with magnetic model option only c Magnetic course over ground Indicator always c M ggg gg Speed over ground 000 to 999 knots u Speed over ground units u N Nautical mile h ggg gg Speed over ground 000 to 999 km h u Speed over ground units u K kilometer h cc Checksum CR LF Carriage return and line feed 7 6 9 ZDA Data Mess...

Page 152: ...eld Description hhmmss ss UTC time in hours minutes seconds of the GPS position dd Day dd 0 to 31 mm Month mm 1 to 12 yyyy Year xx Local zone description in hours xx 13 to 13 yy Local zone description in minutes yy 0 to 59 cc Checksum CR LF Carriage return and line feed ...

Page 153: ...l DGPS lock symbol engaged Verify that DGPS MAX is locked to GPS satellites GPS Lock symbol engaged Check integrity and connectivity of power and data cable connections Verify DGPS MAX Mode of operation Potentially the volume of data requested to be output by the RX 400p could be higher than the current baud rate supports Try using 19 200 as the baud rate for all devices Random data from DGPS MAX ...

Page 154: ...o Tune Verify DGPS MAX antenna port output voltage 5 VDC No DGPS position in external RTCM mode Verify that the baud rate of the RTCM In AUX port matches the baud rate of the external source Verify the pin out between the RTCM source and the AUX port transmit from the source must go to receive of AUX and grounds must be connected Refer to Appendix B Low beacon SNR Check integrity of antenna connec...

Page 155: ... 2 meter Max Position Update Rate Up to 5 Hz Internal OmniSTAR Engine Operational Specifications Item Specification Frequency 1 525 1 559GHz Frequency Tuning Modes Automatic scanning Internal Beacon Engine Operational Specifications Item Specification Frequency Range 283 5 325 kHz Channels 2 Input Sensitivity 2 5 µV for 6 dB SNR 200 bps MSK Rate Acquisition Time 1 Second Typical MSK Bit Rate 100 2...

Page 156: ...C 104 Extrnl mode only Power Specifications Item Specification Input Voltage 9 2 48 VDC Power Consumption with CDA 2MAX 6 5 W Nominal Power Connector Circular 2 pin Locking Plug Mechanical Characteristics Item Specification Enclosure Extruded aluminum with aluminum front and back plates Length 203 mm 8 0 Width 125 mm 4 9 Height 53 mm 2 0 Weight 0 8 kg 1 76 lb Antenna Connector TNC Socket Environme...

Page 157: ...ation Input Voltage 3 6 15 VDC Supplied by Receiver Input Current 50 60 mA Mechanical Characteristics Item Specification Enclosure Aluminum Base Polycarbonate Top Mounting Thread 1 14 UNS 2B Diameter 129 mm 5 08 Height 98 mm 3 85 Weight 456 g 1 0 lb Antenna Connector TNC S Antenna Extension Cable RG 58U 10 m 33 ft in Length Environmental Specifications Item Specification Storage Temperature 40 C t...

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Page 159: ... data output from the DGPS MAX MAIN port is differentially corrected GPS NMEA data To establish communications between the DGPS MAX and your data logging or monitoring device in these modes of operation you must n Connect Pin 2 transmit TX of the MAIN port to the receive pin RX of the data logging or monitoring device n Connect Pin 3 receive RX of the MAIN port to transmit pin TX of the monitor de...

Page 160: ... to setting the DGPS MAX baud rate RTCM Data Output To output only RTCM correction data from a correction source n Choose the desired source of corrections be it WAAS OmniSTAR or beacon n Turn off all NMEA and binary messages in the NMEA Output menu n Turn RTCM on in the NMEA Output menu To establish communications between the DGPS MAX and an external GPS receiver you must n Connect Pin 2 transmit...

Page 161: ... receiver Additionally you must interface the DGPS MAX to an RS 232C serial port of the separate GPS receiver Refer to Section 5 15 3 for instructions related to setting the DGPS MAX baud rate External Correction Input In this operating mode an external correction device inputs RTCM correction data through the DGPS MAX s RTCM In port AUX port In order to accomplish this the DGPS MAX must be operat...

Page 162: ...ired interface between the DGPS MAX and an external GPS receiver 3 RX RTCM 5 GND GND TX AUX External Correction Source Figure B 3 External Correction Source Interface Note For successful communications the baud rate of the DGPS MAX AUX port must be set to match that of the external correction source Additionally you must interface the DGPS MAX to an RS 232C serial port of the external source Refer...

Page 163: ...OmniSTAR then the L band sensor is currently being used If this is not displayed you must change to the use of the internal L band receiver See Section 4 7 1 for information on changing the DGPS source n Access the OmniSTAR menu in the current level of the menu system using either or and press n Use either or to cycle the menu system so that Configure is in focus and press n Press or until Subscri...

Page 164: ...ion Contact information is provided in Table C 1 OmniSTAR License Agreement OmniSTAR requires that you fill out the enclosed license agreement before subscription activation Please read the agreement thoroughly before filling in the require information Be ready to fax the completed agreement when contacting OmniSTAR Note The license agreement enclosed is an agreement between yourself and OmniSTAR ...

Page 165: ...ers North America 1 888 883 8476 1 713 780 9408 Europe and North Africa 31 70 311 1151 31 71 581 4719 Asia Australia New Zealand and South Africa 61 89 322 5295 61 8 9322 4164 Central America and South America 1 713 785 5850 1 713 780 9408 You may visit OmniSTAR s Web site at the following address for further information www omnistar com ...

Page 166: ... be transmitted over the air and received by the internal OmniSTAR receiver Your L band DGPS receiver must be locked to the OmniSTAR service during this procedure Subscription Confirmation To confirm that you have a valid subscription enabled within your L band receiver n Using the or key move the OmniSTAR menu located in the root menu into focus and press n Using the or key move the Configure men...

Page 167: ...csi wireless com This listing contains the following information regarding currently operating beacons and potential new sites n Station name n Frequency n MSK rate n Location n Transmitting ID n Reference station ID n Field Strength n Operating notes This document is viewable within your Internet browser however if you require a faxed copy of this information contact your CSI Wireless dealer or C...

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Page 169: ... for post processing in both static and kinematic mode Static processing is the primary purpose of this feature however kinematic processing is possible In order to achieve acceptable results with kinematic logging of measurement data for post processing we recommend that the kinematic logging session begin with a 15 minute static session and also end with a 15 minute static session To turn these ...

Page 170: ...a format for raw measurement data Please consult your post processing software vendor to determine if your software supports this data format RINEXSLX Translator CSI Wireless has developed a translator from the proprietary binary format in order to convert this data to RINEX This utility is freely available from CSI Wireless for post processing purposes Please contact CSI Wireless or your local de...

Page 171: ... Radio Technical Commission for Maritime Services RTCM Recommended Standards for Differential NAVSTAR GPS Service Version 2 2 Developed by Special Committee No 104 RTCM 1998 1800 Diagonal Rd Suite 600 Alexandria VA 22314 2840 USA Tel 1 703 684 4481 Fax 1 703 836 4429 US Department of Transportation United States Coast Guard Broadcast Standard for the USCG DGPS Navigation Service COMDTINST M16577 1...

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Page 173: ...ch beacon 40 Bar Chart Beacon Mode 57 External RTCM Input 57 OmniSTAR Mode 56 WAAS Mode 55 Baud Rate 29 41 114 140 141 142 Beacon Receiver Performance 41 Beacon Receiver 22 Signal to Noise Ratio SNR 41 Beacon Table 40 Bin95 80 149 Bin96 80 149 Binary Messages 149 Bit Error Rate OmniSTAR 38 Bit Error Rate WAAS 37 C Cables Antenna 32 Data 27 Power 26 CDA 2MAX Antenna Placement 30 Installation 29 Mag...

Page 174: ...25 26 27 K Keypad 45 L L band 21 Lock Status GPS 47 M MAIN Baud Rate 107 109 110 112 136 140 Bin95 Message Menu 80 Bin96 Message Menu 80 Connecting to External Devices 27 Connector Type 136 Default NMEA Message Output 42 GGA Message Menu 77 GLL Message Menu 78 GSA Message Menu 78 GST Message Menu 78 GSV Message Menu 79 Input Protocol 136 NMEA Interface 139 NMEA Message Output Menu 76 Output Protoc...

Page 175: ...ence 54 119 System Setup Menu 106 TuneBeaconName Menu 103 WAAS Configure Menu 85 WAAS DGPS Lock Icon 47 WAAS Status Menu 82 WAAS Menu 81 Menu System Navigation 45 Menu Tree 50 Mount Antenna 1 14 UNS Thread 30 Antenna Surface Mount 31 Magnetic 33 permanent 34 Receiver Flange Bracket 24 Multipath 5 N NAD 83 1 62 63 NMEA 0183 123 NMEA 0183 messages 123 NMEA Data Message GPGGA 125 GPGLL 126 GPGSA 127 ...

Page 176: ...al to Noise Ratio SNR 41 SLXMon 124 Software Utility 124 Survey Adapter 34 SV Count 70 T Temperature 25 Troubleshooting 133 Tune Mode Automatic Beacon Search ABS 39 40 116 Manual 40 114 115 OmniSTAR Automatic Tracking 37 WAAS Automatic Tracking 36 U Universal Time UTC 76 V Velocity 64 W WAAS Bit Error Rate 37 Receiver Performance 37 WGS 84 1 62 63 www csi dgps com xviii ...

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