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Leica Geosystems MX9400N, Руководство пользователя

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Leica Geosystems MX9400N Скачать руководство пользователя страница 19

 

WinFrog User’s Guide - Appendix C – GPS/MX 9400 

Page 19 of 

22

 

Data item:  GPS, MX9400, TIMEDATE 

The TIMEDATE data item must be edited once it is added to a vehicle’s device list. 
Highlight the data item in the vehicle’s device list, then select the Edit button. The Time 
Synchronization dialog box appears as seen below. 

 

 

 

Synchronize Mode 

The synchronization can be turned On or Off. Note that multiple TIMEDATE data 
items can be added to the same or other vehicles, but WinFrog will only allow one to 
be set to On and actually be used to synchronize the WinFrog clock. The others can 
only be compared to the WinFrog clock. 

Synchronization Settings 

The tolerance setting controls the maximum limit of the deviation of the WinFrog 
clock from the timing device before WinFrog resets its clock. This should not be set 
too small, or the clock will constantly be re-setting. A tolerance of 50 ms for a 1PPS 
pulse results in the resetting of the clock approximately every 5-6 minutes. 
 
WinFrog monitors the variation between the UTC time and the WinFrog clock using 
a fading history of the last 20 samples of the variation between the WinFrog clock 
synchronization time stamp and the associated UTC time. This is filtered using a 
Central Tendency algorithm. When the filter result exceeds the tolerance, the clock 
is reset. 
 
Local time offsets can be entered to allow synchronization to UTC while working in a 
local time zone. The offset is entered in +/-hours. 
 

Raw Data Logging Control 

You can control the logging of the TIMEDATE raw data records. Every time 
synchronization data reception update can be logged, i.e. a raw record every 
second. Alternatively, the data is only logged to the raw file when the clock is reset. 

Содержание MX9400N

Страница 1: ...ts to generate three dimensional positions The MX9400 can accept standard RTCM SC 104 input to generate and output a differentially corrected position The MX9400 can also output pseudorange ephemeris and time and date information which can be used by WinFrog s GPS Calculations extension module to internally calculate a GPS position The MX9400 utilizes 4 serial interface ports that communicate via ...

Страница 2: ...NS WINFROG I O DEVICES EDIT I O Serial Configurable Parameters The MX9400 is added to WinFrog from the GPS device group Configure the Device I O Parameters dialog box for the appropriate Baud Rate Data Bits Stop Bits Parity and Comm Port These selections refer only to the WinFrog computer port that is connected to the MX9400 CDU port i e Port 1 on the MX9400 see below for more on the MX9400 s port...

Страница 3: ...data output through the Data Logging port Position GPGLL This is a standard NMEA format type message containing GPS Latitude Longitude data output through the Data Logging port Speed GPVTG This is a standard NMEA format type message containing Track and Speed Over Ground data output through the Data Logging port Residuals GPGRS This is a standard NMEA format type message containing GPS Residual da...

Страница 4: ...n select to send only the GPGGA preferred or the GPGLL item As defined above by default these NMEA messages are output from the Data Logging port i e port 4 In order to interface to the MX9400 through just one of its ports you must reassign this output to another port port 1 Port 1 must be interfaced to WinFrog in order for the CDU commands to be received so this is the port of choice To reassign ...

Страница 5: ...configuration is typical of that used in most WinFrog operations If you are only using the MX9400 s internally calculated position you need only select a Position GPGGA or GPGLL item Once this dialog box is correctly configured click the OK button WinFrog sends the configuration commands to the MX9400 and closes the dialog To reconfigure any one of these options select the MX9400 device in the I O...

Страница 6: ...es in order to calculate a valid 3 dimension position Fixed This mode selection fixes the MX9400 s height to the ellipsoidal height value entered in the Ellipsoid Height box In this mode the MX9400 is able to calculate valid positions using a minimum of three satellites Auto Last Height The MX9400 will calculate a valid 3D position if four or more satellites are available If only three satellites ...

Страница 7: ...hin this box There are four different DGPS modes Off Generate Auto and On Off The MX9400 will not use differential corrections in its position computations for that device even if they are available Instead it will compute only a single point GPS solution Generate The MX9400 will generate base station corrections based on the GPS data being received and the position input at the top of the window ...

Страница 8: ... The MX9400 can also output raw Pseudorange and Ephemeris data for WinFrog to calculate the position itself using WinFrog s GPS Calculations extension module This is setup by adding both the GPS MX9400 PSEUDORANGE and the GPS MX9400 EPHEMERIS data items to the vehicle s device list Additionally a Time Date message can also be output to provide WinFrog with more precise timing information Add the G...

Страница 9: ...ositioning will go to dead reckoning if dead reckoning is turned on You must manually change a Secondary device to Primary in order for the data to be utilized Use For Heading Calculations Select this checkbox if the device is to be used in conjunction with another GPS device for determination of the heading of the vessel Graphics If On is selected a labeled square will show the raw offset but unf...

Страница 10: ...ssociated with the GPS unit being used For all other applications the Code entry must be set to 0 Offsets Offsets are required to associate the GPS antenna position with the vessel s Common Reference Point i e CRP The offsets are applied from CRP of the vehicle to the GPS antenna location Forward Offsets are entered as positive values Aft Offsets are entered as negative values Starboard Offsets ar...

Страница 11: ...hicles position solution that device s position will simply be received and monitored Note that in the case of Primary device failure WinFrog will not automatically use the Secondary devices for the vehicle position computation Instead it will start dead reckoning if dead reckoning is turned on You must manually change a secondary device to primary status if you want to utilize the data coming fro...

Страница 12: ...WinFrog requires a minimum of four satellites to be visible Fixed Select this option to fix the GPS antenna ellipsoid height to the value entered in the Ellipsoid Height field In this mode WinFrog is able to calculate valid positions using a minimum of three satellites Auto Last Height If this mode is selected WinFrog will calculate a 3D position if four or more satellites are available If only th...

Страница 13: ...othing utilizes the GPS receiver s observations of the GPS satellite s carrier signals Because the GPS L1 frequency has a wavelength of only 19 cm measurements made using this signal will provide higher accuracy than measurements made on the C A code message modulated onto the L1 signal Note however that since the carrier phase position is derived from the C A code position it does not offer an im...

Страница 14: ... Ref position and all individual solutions Data The Calculations window will show the results of the GPS Calculations including the Multi Ref position and data related to each individual carrier phase solution when Phase Smoothing is enabled Statistics The Calculations window will show the results of the GPS Calculations including the Multi Ref position and statistical data related to each individ...

Страница 15: ... will not use measurements from any satellites with elevation angles below the angular value input in the Elevation Angle Cutoff field Any satellites not used in the pseudorange position calculations are indicated in the Calculations window by a change of color Min SN Minimum Signal to Noise This field is used to set the minimum signal to noise ratio for the pseudorange calculations If a satellite...

Страница 16: ...ion approaches the minimum required it is unlikely that WinFrog will ever have to stop the exclusion of data due to insufficient satellites Nonetheless WinFrog still checks for this condition Caution should be exercised when using this option If the vessel is too far away from the selected reference stations and or there are few satellites in common with the vessel and the reference station s the ...

Страница 17: ...ns are utilized in the solution each with the same Relative Standard Deviation The individual station method is preferable as it allows you to remove or de weight solutions that may not agree with the weighted mean solution If this method is used you should add the RTCM data item to the vehicle s device list once for each solution then edit that solution entering the proper code and coordinates Fo...

Страница 18: ...ted from the data Monitor Reference Station is simply monitored by WinFrog and is not used in the Multi Ref position This solution will appear in yellow text in WinFrog s Calculations window Rel Std Dev This value defines the relative standard deviation of this solution as compared to the other solutions used in the Multi Ref position Equal Rel Std Dev values indicate that all individual solutions...

Страница 19: ...ce before WinFrog resets its clock This should not be set too small or the clock will constantly be re setting A tolerance of 50 ms for a 1PPS pulse results in the resetting of the clock approximately every 5 6 minutes WinFrog monitors the variation between the UTC time and the WinFrog clock using a fading history of the last 20 samples of the variation between the WinFrog clock synchronization ti...

Страница 20: ...lowing information is displayed Status Displays the data type status On Off and the associated device status Sync d at Displays the time the WinFrog clock was last adjusted Computer time WinFrog clock time stamp of last synchronization data input UTC time UTC time from device of last synchronization data input Raw Delta The difference between the UTC and associated WinFrog time stamp UTC WinFrog f...

Страница 21: ...top proprietary outputs on CDU port PMVXG 026 1 turn off equip port output PMVXG 007 412 1 5 turn psn output to CDU port PMVXG 007 100 1 2 turn SV trking status output to CDU port PMVXG 007 000 1 5 turn RCVR status output to CDU port PMVXG 001 d 3lf 3lf 1lf c 0lf tempHgtMode PMVXG 053 d 0lf 0 6 d 0 0 0 tempDgpsCode PMVXG 034 d 0 0 1lf d 0 tempBitR Rate of 50 1 100 2 or 200 3 Items to Send Messages...

Страница 22: ...Measurement Accuracy 10cm code single epoch 5mm phase Connectors Multiport I F DB25S Time SMB Jack receptacle Event Input SMB Jack receptacle Antenna SMA Jack receptacle Power DC Power Jack 0 1 dia Navigation Mode Operating Modes 2D or 3D DGPS GPS or auto selection DGPS Input RTCM SC 104 format Time to First Fix 1 minute typical Accuracy Position 30 cm RMS 15 cm RMS AccucodeTM Velocity 05 m s RMS ...

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