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NAVSYNC CW25 User Manual

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CW25 GPS
Receiver

User Manual

Issue: R03
Bulletin
NS15-UM
Revision
03
Date
16 June 2008

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Summary of Contents for NAVSYNC CW25

  • Page 1: User Manual

    CW25 GPS Receiver User Manual Issue: R03 Bulletin NS15-UM Revision Date 16 June 2008...

  • Page 2: Table Of Contents

    4.5 I/O Signals ............................13-14 5. FEATURES ..................................15 5.1 Power on Reset ............................15 5.2 Time Transfer ............................. 15 5.3 CW25 Embedded Identification ........................ 15 5.4 Build Options ............................. 15 6.OPERATING MODES ..............................16 6.1 Stand Alone Operation ..........................16 6.2 Net Assisted Operation ..........................
  • Page 3 World Wide Web Information ........................47 APPENDIX 4 ..................................48 Tape & Reel Specifications ........................48 Solder Profile ............................. 48 CW25 Software User Manual Page Rev 03 Date: 06/16/08 3 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 4: Description

    At outdoor signal levels the time taken to obtain a ‘hot’ position fix is under 2 seconds. With a size of just over an inch square (25 x 27 mm) the CW25 is specifically designed to be integrated with communi- cations devices such as GSM, CDMA, UMTS modems or any other communications medium.

  • Page 5: Global Positioning System

    1.3 GPS positioning and navigation The CW25 Receiver needs to be able to see at least 4 satellite vehicles (SV’s) to obtain an accurate 3-D position fix. When travelling in a valley or built-up area, or under heavy tree cover, you will experience difficulty acquiring and maintaining a coherent satellite lock.

  • Page 6: Standard Positioning Service (Sps)

    CEP and SEP are not affected by large errors, which could make the values an overly optimistic measurement. These probability statistics are not suitable for use in a high accuracy positioning system. The CW25 reports all accuracy’s in the form of a standard deviation (RMS) value.

  • Page 7: Specification

    30ns rms accuracy, <5ns resolution, Factory customisable pulse width Event Input 30ns rms accuracy, <10ns resolution Frequency Output (GPIO [0]) 0 MHz to 20 MHz (CW25-NAV) 10 Hz to 30 MHz (CW25-TIM) Receiver Type 12 parallel channel x 32 taps up to 32 point FFT. Channels, taps and FFT can be switched off to minimize power or simulate simpler designs.

  • Page 8: Absolute Maximum Ratings

    Comms & I/O RF25IC BB25IC TRIM/EXT_CLK Clock RTC & Filter EEPROM NPOR VBATT Figure 1 Block Diagram CW25 Software User Manual Page Rev 03 Date: 06/16/08 8 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 9: Physical Characteristics

    3.1 Physical Interface Details The interface to the CW25 is via 1mm castellation on a 2mm pitch. There are 42 connections in all. There is also an RF connector for connecting to the GPS antenna. The details of the interface connections are given below.

  • Page 10: Mcm Dimensions

    RF_IN castellation. If the RF_IN castellation is to be used, the pad should be shortened by 0.5mm underneath the CW25 and standard RF design practices must be observed.

  • Page 11: Signal Description

    4. SIGNAL DESCRIPTION The signals on the CW25 are described in the table below. All Test, Control and I/O ports are CMOS 3.3V compatible un- less specified otherwise. 4.1 Power Signals RF_3V3 Type: Power Direction: Input Pin: 19 The RF supply input. This 3.3V ± 10% input supplies the 3.0V LDO regulator in the RF section of the CW25.

  • Page 12: Rf Signals

    This signal has an RF blocked connection to the ANT_SUPPLY signal. This is the same signal presented on the RF connector on the CW25. Only one antenna connection should be made. If the RF connector is to be used, then there should be no connection, even an unconnected pad, to this castellation.

  • Page 13: Control Signals

    The Power On Reset signal. This active low, open collector signal is the master reset for the CW25. This should be driven with an open collector reset circuit for a minimum of 100ms. An external pull-up is not required if the 100K internal pull-up is sufficient. The CW25 can be held in reset by asserting this signal.

  • Page 14: Signal Description

    DIG_GND. N2WCK Type: I/O Direction: Input/Output Pin: 28 The NavSync 2 Wire Clock signal. This is the open collector I C compatible clock signal for the 2 wire serial interface. The signal return path is DIG_GND. N2WDA Type: I/O...

  • Page 15: Features

    The power on reset for the CW25 is generated on-board by the regulator in the RF section from the RF_3V3 signal. The RF_3V3 signal must be applied to the CW25 at the same time as the DIG_3V3, if the on-board power on reset is to be used.

  • Page 16: Operating Modes

    7. Power Management The CW25 GPS receiver is a low power module consuming less than 0.6W typically for a 1Hz update of position. The re- ceiver contains software to dynamically reduce power consumption wherever possible. Where channels and taps are not needed they are switched off.

  • Page 17: Communications Protocols

    All ports are configured as 8, bits no Parity, with no handshaking. 8.2 Output Format There are two types of messages that can be output from the CW25 receiver, these are split into NMEA sentences and Debug messages. Both types of outputs are ASCII strings.

  • Page 18: Gpgga - Gps Fix Data

    2-D Horizontal Dilution of Precision (0.00 to 99.99) VDOP Vertical Dilution of Precision (0.00 to 99.99) Message checksum in hexadecimal CW25 Software User Manual Page Rev 03 Date: 06/16/08 18 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 19: Gpgsv - Gps Satellites In View

    Mode Indicator: D = Valid, Differential, A = Valid, Autonomous, E = Invalid, Estimated, N = Invalid, Not Valid Message checksum in hexadecimal CW25 Software User Manual Page Rev 03 Date: 06/16/08 19 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 20: Pvtg - Course Over Ground And Ground Speed

    8.2.1.8 POLYT - Time of Day $POLYT,hhmmss.sss,ddmmyy, UTC_TOW ,week, GPS_TOW ,Clk_B , Clk_D ,PG,LocalTTag,BAcc,TAcc,BLANK*cs Name Description $POLYT Navsync Proprietary NMEA sentence header (Position Data) hhmmss.sss UTC Time in hours, minutes, seconds and decimal seconds format. ddmmyy Date in day, month, year format.

  • Page 21: Polyp- Position Data

    $POLYP,hhmmss.sss,Latitude,N,Longitude,E, AltRef ,FS,Hacc,Vacc, SOG , COG , V_vel,ageC,HDOP,VDOP,PDOP,GDOP,TDOP,GU,RU,DR*cs Name Description $POLYP Navsync Proprietary NMEA sentence header (Position Data) hhmmss.sss UTC Time in hours, minutes, seconds and decimal seconds format. Latitude User datum latitude degrees, minutes, decimal minutes format (ddmm.mmmmmm) Hemisphere: ‘N’= North, ‘S’ = South Longitude User datum longitude degrees, minutes, decimal minutes format (dddmm.mmmmmm)

  • Page 22: Polys - Satellite Status

    Note: {} designate optional sections that appear only if there is satellite data Name Description $POLYS Navsync Proprietary NMEA sentence header (Satellite Data) Number of GPS satellites tracked Satellite PRN number (1-32) Satellite status - = not used U = used in solution...

  • Page 23: Debug Messages

    Any additional pages specific to soft- ware versions are not described in this manual. 8.2.3.1 Navigation and Timing Summary ($11) Navigation Summary Page 12x32x32x16 CW25 1.741 May 10 2004 15:03:41 Time 140533.70 3840 1270 137133.708 1...

  • Page 24: Rf & Agc Data ($52)

    DC offset of up to a few percent due to the adjustment resolution in the RF front end. CW25 Software User Manual Page Rev 03 Date: 06/16/08 24 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 25: Command Format

    Q: Command, a query command to the CW25 receiver. S: Command, requires the CW25 receiver to set system settings. R: Response to a CW25 receiver, response to a $PRTH Query or an acknowledgement of a $PRTH Set. <id> is a 4 character command identifier.

  • Page 26: Prth, Dyna: Receiver Dynamics

    = Drone, Missile dynamics (<16g) = Pure least squares mode (ie semi-infinite dynamics assumed) Default for CW25-NAV is 3, maximum is 5. Default for CW25-TIM is 1 and changes to 0 after 10 minute location survey completed, maximum is 5.

  • Page 27: Prth, Rset: Re-Set The Receiver

    The data areas that can be cleared include satellite almanacs, ephemerides, network assist and receiver configuration parameters. Note that “sleep” mode is not currently supported in the CW25 technology. This command invokes a 2 second time-out prior to the reset being called.

  • Page 28: Prth, Illh: Initialized Lat, Long, Height Position

    Explanation of Parameters Frequency The frequency in Megahertz that the receiver will output. CW25-TIM defaults to 10 MHz, 30 MHz maximum. CW25-NAV defaults to 0 MHz (disabled), 20 MHz maximum. e.g. for 10kHz = 0.010 = switch digital frequency off.

  • Page 29: Prth, Mmsv: Min & Max Satellites For A Position Solution

    (epochs). The dead reckoning will progress at constant velocity for the first half of this period and then reduce to a standstill during the second half. Note that since this value has units of epochs, it will have a different effect on a 1Hz CW25 receiver to that on a 2Hz, 5Hz or 10Hz CW25 receivers.

  • Page 30: Network Assistance Input

    8.4 Network Assistance Input The CW25 uses network assistance data to allow acquisition and tracking of GPS satellites in low signal levels. The net- work assistance data is base on the TIA/EIA/IS-801 specification as using the CDMA network. The format used is an ASCII version of the data to allow the contents of the messages to be displayed on a terminal.

  • Page 31: Nmea And Uart Configuration Details

    $PRTHS, U3CM 9.1 NMEA Configuration Query ($PRTHQ, UxOP): The command takes the form “$PRTHQ,UxOP” where x is a port number. On the CW25 platform, the port number is always between 1 and 3 inclusive. The remainder of the strings is of the form “$PRTHR,UxOP,GLL=1,GSV=4,PLT=1” where x is the port number for which the information was requested.

  • Page 32: Uart Configuration Query ($Prthq, Uxcm)

    CW25 platform. Consequently, the Rx and Tx baud rates must always be specified to be the same value. In addition, the CW25 platform does not currently support the use of parity, or of stop bit settings other than 1 stop bit. The supported baud rates are: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, and 230400.

  • Page 33: Ild Network Assist Message Format

    Navsync Base Station. These messages are suitable for use as a Network Assistance input to the CW25 receiver module. They are a series of ASCII comma separated messages which are output from UART3 of the CW25 based ILD Base Station Receiver at 38400,8,N, 1.

  • Page 34: Message Definitions

    6 parity bits leaving the 24 data bits seen in the above example. 8-bit accumulative checksum of all bytes in-between the # and & characters in hexadecimal. CW25 Software User Manual Page Rev 03 Date: 06/16/08 34 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 35: Klb, Klobuchar Ionospheric Parameters Message

    (x 1 seconds) 8-bit accumulative checksum of all bytes in-between the # and & characters in hexadecimal. CW25 Software User Manual Page Rev 03 Date: 06/16/08 35 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 36: Tim, Time Input Message

    Vertical RMS uncertainty bearing of semi-major axis (metres) 8-bit accumulative checksum of all bytes in-between the # and & characters in hexadecimal. CW25 Software User Manual Page Rev 03 Date: 06/16/08 36 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 37: Example Sequence Of Messages

    #UCP, -20, -8,15,3,13,222,5,13&68 #ALM, 16,1283,5014B5, 0F0C4C,FD5500, A10C39, 97277F,C8792E, FAD2CF, 010002&6E #ALM, 17,1282,518D10, 90108E,FD4900, A10CD1, F63811, 8FCC07, 7F941E,F0FFB0&8A CW25 Software User Manual Page Rev 03 Date: 06/16/08 37 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.
  • Page 38 #ALM, 03,1283,432F7E, 0FF64D,FD3B00, A10D11, BEB470, 15D9EF, 7CA673, 040031&84 #WTP, 1282,467146.435,3912415, -78915,5020028, &DB #EPH,27,409000,191EA0,D180AF,B1A11B,D70FF6,A17241,0000A0,2E0662,A1FBD8,349A61,E6DEFE,FBE609,5CBA11, 0ADAA1,0DAEAD,724135,00216F,302D23,FF4726,B8F287,221CA8,A1D0AE,FFA787,A1018D&DE #ALM,04,1283,443663,0F0AA4,FD4500,A10D41,ED6DD4,FDA9F2,052B62,E0FF85&9E #ALM,05,1283,452CD1,0FFBF7,FD3C00,A10D46,94244E,22EAF7,F70045,050016&68 CW25 Software User Manual Page Rev 03 Date: 06/16/08 38 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.
  • Page 39 #ALM,14,1283,4E0AB1,0F1791,FD5D00,A10CB3,41D87B,BB15FC,79C4E8,FC0019&AB #WTP,1282,467151.555,3912418,-78914,5020030,&D5 #EPH,05,409103,1DDDE3,D180AF,B1A11B,D70FF7,387080,00000F,059C84,38FB53,375532,23061B,FBAC02,CBD5FA, 13B4A1,0DCF97,70807C,FFDC99,1E10E7,000626,261485,16E322,EB337C,FFA480,38F9C1&93 #ALM,15,1283,4F4826,0F0F3F,FD4C00,A10CDC,EF95B3,5D7FC0,24AD4C,27003F&C1 #ALM,16,1283,5014B5,0F0C4C,FD5500,A10C39,97277F,C8792E,FAD2CF,010002&6E #WTP,1282,467152.579,3912418,-78914,5020031,&DD #KLB,5,2,-1,-2,38,3,-1,-4&BA #UCP,-20,-8,15,3,13,222,5,13&68 #ALM,17,1282,518D10,90108E,FD4900,A10CD1,F63811,8FCC07,7F941E,F0FFB0&8A #ALM,18,1282,522AA4,900DCE,FD4700,A10D0E,1DF18C,88F19F,28FEAD,F7FFF8&FA #WTP,1282,467153.603,3912419,-78914,5020031,&D3 #EPH,06,409001,191EA0,D180AF,B1A11B,D70FF5,4B7242,000145,2C7A40,4B084E,38258E,0A93F7,068403,6813BB, 1294A1,0E1379,72427F,0059C5,DCF2CA,FFE026,199E24,1831AF,1F3454,FFA567,4B0CA5&41 #ALM,19,1283,531D34,0F0B61,FD5700,A10C3B,C40980,B01E11,C94607,FE0028&41 #ALM,20,1283,54133D,0F0DC9,FD4100,A10C6F,16E0FE,41DD95,D2B291,EE002D&92 CW25 Software User Manual Page Rev 03 Date: 06/16/08 39 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 40: Time Pulse Interface

    < 0.33 v at 6mA sink) 13. Frequency Output The CW25 is capable of producing a user select frequency. The frequency is output on GPIO [0] port (pin 39). The frequency is configured using the FRQD command as detailed in section 8.3.10.

  • Page 41: Application Hints

    1.8V source e.g. switch mode power supply, rather than the on-board linear regulator. If the source impedance of the power supply to the CW25 is high due to long tracks, filtering or other causes, local decoupling of the supply signals may be necessary. Care should be taken to ensure that the maximum supply ripple at the pins of the CW25 is 50mV peak to peak.

  • Page 42: Grounding

    14.4 Battery Backup The CW25 has an on-board real time clock (RTC). This is used to store date and time information whilst the CW25 is pow- ered down. Having a valid date and time speeds the time to first fix (TTFF), allowing the CW25 to meet its quoted TTFF specification.

  • Page 43: Over Voltage & Reverse Polarity Protection

    14.6 Reset Generation The power on reset for the CW25 is generated on-board. It is generated by the regulator for the RF section. This signal is an active low, open collector signal and is presented on the NPOR castellation. If it is desired to extend the power on reset signal or provide a manual reset for the CW25, this signal can be driven from an open collector source at any time.

  • Page 44: Glossary

    Similar to Almanac, but providing very accurate orbital data of each individual satellite and transmitted by the satellite concerned CW25 Software User Manual Page Rev 03 Date: 06/16/08 44 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.
  • Page 45 Position Dilution of Precision, including horizontal and vertical components. pps, PPS Pulse per Second, and Precise Positioning Service CW25 Software User Manual Page Rev 03 Date: 06/16/08 45 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.
  • Page 46 Vertical Dilution of Precision World Geodetic System (a world-wide Datum, GPS works in WGS84 which has superseded WGS72) CW25 Software User Manual Page Rev 03 Date: 06/16/08 46 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 47: Appendix 2

    For information on the NMEA protocol specification: www.nmea.org General GPS Information Glossary of GPS terms: www.gpsworld.com/resources/glossary.htm CW25 Software User Manual Page Rev 03 Date: 06/16/08 47 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.

  • Page 48: Appendix 4

    60-90 sec Typ. (2 min Max) Ramp Slope not to exceed ±3°C/sec Time (sec) Figure 11 Solder Profile CW25 Software User Manual Page Rev 03 Date: 06/16/08 48 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.
  • Page 49 CW25 Software User Manual Page Rev 03 Date: 06/16/08 49 of 50 Copyright ©2007 NavSync Ltd.All Rights Reserved Specifications subject to change without notice.
  • Page 50 CW25 User Manual Revision Revision Date Notes P 0.1 01/24/07 Preliminary User Manual P 0.2 05/03/07 Updated to new Format V1.0 08/26/07 Updated to Released Version V1.03 11/07/07 Revisions and Edits Update 04/21/08 Data Updates & Update to new Revision System 06/16/08 Data Revisions to Section 8 &...

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