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TW5340 User Manual

13

©2014 -2015 Tallysman Wireless, Inc.

Confidential

250 ms

750ms

1PPS_A

1PPS_B

0V

3V

0V

3V

Figure 7

The default pulse width is 250 ms, but is configurable from 100 ms to 500 ms. Typical
jitter is 20ns. Signal levels are differential, 0.V to 2.03V.

After obtaining a GPS fix, the 1PPS output will be accurately maintained even when
tracking only one satellite. Once synchronized the 1PPS maintains synchronization
accuracy with no GPS reception by fly-wheeling for a period.

The following examples are provided for termination of the 1PPS signals.

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Summary of Contents for TW5340

Page 1: ...TW5340 Integrated GPS GLONASS Receiver Antenna User Manual Visit us on the web www tallysman com Document 61 0009 0 ...

Page 2: ...less Inc All Rights Reserved This document and the subject matter herein are proprietary items to which Tallysman Wireless Inc retains an exclusive right to reproduction manufacture and sale This document is submitted in confidence for the use of the recipient alone or in conjunction with Tallysman Wireless Inc and its licensees and for no other purpose whatsoever unless permission for further dis...

Page 3: ...8 6 Hardware Interface 9 6 1 TW5340 Installation 10 6 2 Testing 10 Test Adaptor Pin outs 11 NMEA Output test 11 Satellite Output Test 12 6 3 Power 12 6 4 1PPS 12 Cable Delays 14 Fix Quality 1PPS Qualification Standby 14 6 5 Wake Up Input 15 7 Operating Modes 15 7 1 Navigation Mode 15 7 2 Standby Mode 16 Initialize GPS time 16 7 3 Low Power Mode 17 8 Satellite Based Augmentation System SBAS 18 9 TW...

Page 4: ...ial Loading new Firmware 20 9 2 INTERFACE TAB 21 9 3 GENERAL TAB 21 9 4 MESSAGES TAB 23 9 5 CONSTELLATIONS 27 9 6 TRACKING 28 9 7 1 PPS TAB 29 9 8 STANDBY TAB 31 10 NMEA Message Reference 32 RMC 32 GGA 33 GSA 34 GSV 35 VTG 36 GLL 36 GNGNS 37 ZDA 38 Usage 38 WAAS 39 ...

Page 5: ...sitioning by predicting satellite ephemeris data based on previous observations this results in extremely fast Time To First Fix The TW5340 supports 3 modes of operation Navigation Standby and Low Current expert mode parameters only A hardware interface is provided for external application to control the Standby mode this is especially useful in applications that require low current drain The TW53...

Page 6: ...t or mast mount installations It is available with low profile radome for use in tracking applications and with a conical radome for timing applications Figure 2 TW5340 Features Standalone Integrated GPS GLONASS Receiver Antenna 32 channel simultaneous operation High performance tracking 162dBm Fast time to first fix 35mS Accutenna Dual feed antenna high multipath rejection SBAS Capable ...

Page 7: ...22 Fix Qual Standby Wake up Table 1 2 1 Ordering Information Part Numbering 33 5340 X YY GPS GLONASS Smart Antenna 33 5341 X YY Non magnetic GPS GLONASS Smart Antenna 27 0045 1 TW5340 Test Adaptor Where X interface voltage 0 RS232 12V 1 RS232 5V 2 CMOS 5V 3 CMOS 3 3V 4 N A 5 RS232 3 3V YY Radome 00 grey conical 10 grey low profile 01 white conical 11 white low profile 3 GNSS Systems Tallysman TW53...

Page 8: ...on GN indicates Talker ID for all constellations 5 Software Utilities 5 1 Open Source GPS Software Utilities The following open source GPS utility can be used to display the GPS and GLONASS GGA and GSV messages with Talker ID s GP and GL http www visualgps net VisualGPSView Note GN Talker ID s are not currently supported by this application This VisualGPS application can log data which can subsequ...

Page 9: ...ng on model 8 Brown White Gnd 0V 7 Blue White RX into the TW5340 RS232 level 6V CMOS 3 3V 5 Orange TX out of the TW5340 RS232 level 6 6V CMOS 3 3V 6 Green White Differential 1PPS output 1PPS_B 0 to 2 0V levels 1 Green Differential 1PPS output 1PPS_A 0 to 2 0V levels 2 Orange White Wake up Input Wake Up input Low not supported on Rev 1_0 release 3 Blue Fix Quality 1PPS Qualification Standby status ...

Page 10: ...iver Antenna will obtain a 3D fix GPS fix with a minimum of 4 satellites 6 2 Testing Tallysman TW5340 DB9 Test adaptor part 27 0045 1 connects to the RJ45 connector on the TW5430 and provides a DB 9 COM port connection to a PC for testing purposes Figure 4 shows the test system set up connect the adaptor RED wire to the positive supply and the Black wire to Gnd If the TW5340 outputs at RS232 level...

Page 11: ...t Adaptor 27 0045 1 Power Pin 8 Brown Gnd Pin 7 Brown White Pin 5 Gnd TX out Pin 6 Orange Pin 2 RX into PC RX in Pin 5 Blue White Pin 3 TX out of PC Table 3 NMEA Output test Run the VisualGPS application see section 5 1 select the NMEA tab to display message output Set COM Port Select Tools Connect to GPS Figure 5 ...

Page 12: ...section 9 for configuration details The SBAS satellite is indicated by its NMEA ID and not the PRN See Table 5 for details 6 3 Power The TW5340 operates from 3 3V 5V and 6to 16 volts Overvoltage and transient protection is provided making it suitable for installation in the harshest of vehicle installations On the RJ45 connector shown in Figure 3 Connect the BROWN wire on the TW5340 to Positive su...

Page 13: ...00 ms to 500 ms Typical jitter is 20ns Signal levels are differential 0 V to 2 03V After obtaining a GPS fix the 1PPS output will be accurately maintained even when tracking only one satellite Once synchronized the 1PPS maintains synchronization accuracy with no GPS reception by fly wheeling for a period The following examples are provided for termination of the 1PPS signals ...

Page 14: ...e check the data sheet for additional information Cable Delays The timing of the 1PPS pulse depends on the length of both antenna and interface cables to account for cable delays add 3ns for each meter of cable Fix Quality 1PPS Qualification Standby This output has a dual function by default it is a Fix Quality 1PPS qualification output ...

Page 15: ...e clocks and provide a stable 1PPS output On loss of 1PPS qualification status the 1PPS qualification output is maintained for the Fix Quality Flywheel time see section 9 3 0V 2 0 V 1PPS Qualification output 1 PPS Qualification status 1PPS Qual Start delay 1PPS Qual stop delay Figure 9 6 5 Wake Up Input The Wakeup input is pulled high by the TW5340 It must be left in this state to enter standby mo...

Page 16: ...ndby state by the wakeup pin otherwise it will wake after the specified sleep time Pin 3 on the TW5340 can be used to wake the device up To exit Standby mode the Wake Up pin must be pulsed low for approximately 1 ms by an open collector output Note If the TW5340 is in Standby mode for greater 30 minutes the ephemeris data may old and have to be re acquired before a GNSS position can be resolved re...

Page 17: ...ommunications channel PSTMINITTIMEOK cr lf If success PSTMINITTIMEERROR cr lf If no success 7 3 Low Power Mode Contact Tallysman Wireless for details on enabling low power mode After the TW5340 has acquired a position fix and ephemeris and almanac data has been obtained the receiver is ready to enter Low Power Mode The TW5340 receiver s adaptive power management algorithm switches off RF hardware ...

Page 18: ...system Configure the SBAS satellite ID closest to your Location Service Satellite Name NMEA Satellite ID PRN Location longitude WAAS Inmarsat 4 F3 46 133 98 W WAAS Galaxy 15 48 135 133 W WAAS Anik F1R 51 138 107 3 W EGNOS Inmarsat 3 F2 33 120 15 5 W EGNOS Inmarsat 4 F2 39 126 25 E EGNOS Inmarsat 3 F1 44 131 64 5 E MSAS MTSAT 1R 42 129 140 E MSAS MTSAT 2 50 137 145 E Table 5 Table The default satel...

Page 19: ...eters are saved so that you can always retrieve and Write them back if required To write a new set of parameters to the TW5340 select Program Write The configuration file can be save by selecting File Save Note Most configuration parameters changes do not take effect until the TW5340 is reset i e power cycled The configurator provides configuration of the general parameters of the TW5340 Contact T...

Page 20: ...In the event that Tallysman Wireless releases an upgrade to the TW5340 firmware or you wish to write custom firmware including new default parameters to the TW5340 Select Program Load firmware Figure 12 To load Custom firmware using new default parameters select Use Custom Firmware And select the bin file to load To load a new firmware update to the TW5340 select Official Firmware Select the Write...

Page 21: ... Pin 2 of the TW5340 to indicate Fix Quality OK 1PPS Qualification Fix Quality Start Delay default 10 ms Inserts a delay before asserting Fix Quality OK This is the period that the TW5340 waits after detection of a good fix before outputting a 1PPS qualification signal The TW5340 uses this period to ensure that the TW5300 has time to average out the satellite clocks and provide a stable 1PPS outpu...

Page 22: ... to make reliable in route navigation suggestions to the user 5 10 Moderate Positional measurements could be used for calculations but the fix quality could still be improved A more open view of the sky is recommended 10 20 Fair Represents a low confidence level Positional measurements should be discarded or used only to indicate a very rough estimate of the current location 20 Poor At this level ...

Page 23: ...atellite on GSV Message The SBAS satellite information is output in a GSV message NMEA 3 01 Mode field on RMC VTG and GLL messages Setting this option will enable a mode field to be appended to the RMC VTG and GLL sentences as required by the NMEA 3 01 specification See the mode indicator in the GNGNS NMEA message section 10 under GNGNS Start Up header message Outputs device information on reset i...

Page 24: ...r all constellations Delay from Fix to Start of Output Message output can be delayed related to time of the current fix This establishes a known offset from the receipt of the NMEA message to the time stamp within the message thus permitting reliable time transfer This feature only applies to the high priority message list 3 If the start of a NMEA out message is being used for timing purposes the ...

Page 25: ...sage list 1 is the standard message list Use message list 1 if the NMEA multiple output rate feature is not required NMEA Message List 2 Use to output messages at a different rate For example GSV and GSA can be output at a much lower rate than RMC or GGA NMEA Message List 3 Message list 3 is reserved for those messages which need to be sent at a high rate 10hz and or require accurate message outpu...

Page 26: ...ace tab set the NMEA Baudrate to at least 115200 The next time the configurator is run be sure to set the COM Port Baudrate in the Program Menu COM Port tab to the same value 2 In the General tab set a Fix Rate sec option to 1 b CPU Clock Speed option to 208 MHz PLL 3 In the Message tab set a Delay from Fix to Start of Output ms option to 0 b Uncheck all items from List 1 and List 2 c Check just o...

Page 27: ... Enable SBAS WAAS When set and if data is currently received from an SBAS satellite then the TW5340 includes the SBAS corrections in the calculated position SBAS Auto Search default ON The TW5340 will automatically search for an appropriate satellite in view SBAS PRN Set the SBAS satellite number to track SBAS 1 Parameter PRN Two additional SBAS satellites can be added to the SBAS search list Ente...

Page 28: ...led when doing wander testing High Dynamics default off The receiver engine uses different filters for high acceleration applications Must be enabled when the fix rate is 5Hz Acquisition Mask Angle degrees The elevation angle of a GNSS satellite below which data will be ignored when acquiring a fix A lower mask angle may lead to faster acquisition Positioning Mask Angle The elevation angle of a GN...

Page 29: ...old to be included in a fix calculation The default is 15 which helps reduce multi path errors Default 2D DOPS A low DOP value represents a better positional precision due to the wider angular separation between the satellites used to calculate a unit s position These are the maximum allowable values for calculating a 2D fix Default 3D DOPS These are the maximum allowable values for calculating a ...

Page 30: ...1 PPS pulse the default configuration is 250ms 1PPS Correction Delay in ns This is a time correction to compensate for any 1PPS delays due to cable length or the RF chain Hold Position Latitude degrees Sets the latitude for the position hold mode Hold Position Longitude degrees Set the longitude of the position hold mode Hold Position Height meters Set altitude for the position hold mode 1PPS Elev...

Page 31: ...ut 1PPS output enabled base on selection 1PPS Constellations The 1 PPS derived from GPS GLONASS or both 9 8 STANDBY TAB Enable Periodic Standby Enables the Standby mode low current consumption feature Sleep Time seconds Sets the sleep time in seconds Fix Time seconds Sets the navigation wake time to acquire a fix In order to refresh satellite ephemeris data the receiver should be configured to tra...

Page 32: ...fields separated by commas followed by an optional checksum and terminated by carriage return line feed The data fields are uniquely defined for each sentence type RMC Recommended Minimum Navigation Information Fields UTC Time Status V Navigation receiver warning A Valid Latitude N or S Longitude E or W Speed over ground knots Track made good degrees true Date ddmmyy Magnetic Variation degrees E o...

Page 33: ...s 3 PPS fix 4 Real Time Kinematic 5 Float RTK 6 estimated dead reckoning 7 Manual input mode 8 Simulation mode Number of satellites in view 00 12 Horizontal Dilution of precision meters Antenna Altitude above below mean sea level geoid in meters Units of antenna altitude meters Geoidal separation the difference between the WGS 84 earth ellipsoid and mean sea level geoid means mean sea level below ...

Page 34: ...ugh 64 for SBAS 64 for GLONASS ID of 1st satellite used for fix ID of 2nd satellite used for fix ID of 3rd satellite used for fix ID of 4th satellite used for fix ID of 5th satellite used for fix ID of 6th satellite used for fix ID of 7th satellite used for fix ID of 8th satellite used for fix ID of 9th satellite used for fix ID of 10th satellite used for fix ID of 11th satellite used for fix ID o...

Page 35: ...0 90 leading zeros sent Azimuth in degrees to true north 000 359 leading zeros sent SNR in dB 00 99 leading zeros sent more satellite info quadruples like 4 7 n checksum Example GPGSV 3 1 11 03 03 111 00 04 15 270 00 06 01 010 00 13 06 292 00 74 GPGSV 3 2 11 14 25 170 00 16 57 208 39 18 67 296 40 19 40 246 00 74 GPGSV 3 3 11 22 42 067 42 24 14 311 43 27 05 244 00 4D Some GPS receivers may emit mor...

Page 36: ...egrees M Magnetic Speed Knots N Knots Speed Kilometers per Hour over ground K Kilometers per Hour FAA mode indicator NMEA 2 3 and later Checksum GLL Geographic Position Latitude Longitude Field Latitude N or S North or South Longitude E or W East or West Universal Time Coordinated UTC Status A Data Valid V Data Invalid FAA mode indicator NMEA 2 3 and later Checksum ...

Page 37: ...s Satellite system used in non differential mode in position fix D Differential including all OmniSTAR services Satellite system used in differential mode in position fix P Precise Satellite system used in precision mode Precision mode is defined as no deliberate degradation such as Selective Availability and higher resolution code P code is used to compute position fix R Real Time Kinematic Satel...

Page 38: ...sum data always begins with ZDA ZDA Time Date UTC day month year and local time zone Field UTC time hours minutes seconds may have fractional subsecond Day 01 to 31 Month 01 to 12 Year 4 digits Local zone description 00 to 13 hours Local zone minutes description apply same sign as local hours Checksum Example GPZDA 160012 71 11 03 2004 1 00 7D Usage PSTMCPU 53 13 0 52 6d Field of CPU usage Clock S...

Page 39: ... Inc Confidential WAAS PSTMSBAS 1 2 133 43 2C Field Status 1 WAAS ON Acquire flag PRN Elevation Azimuth Two SBAS channels can be tracked PSTMSBASCH 0 133 26 76 Field Channel PRN Elevation Azimuth PSTMSBASCH 1 0 0 42 Field Channel PRN Elevation Azimuth ...

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