Novatel OM-AD-0020 - page 29

Appendices

Test Bed Receiver Subsystem Addendum – Rev 1 29

communications ports support user-selectable bit rates of 300 - 115,200 bps, w ith a default of 9600 bps. The digital

section does the following:

• converts the IF analog signals to a digital format

• tracks the C/A codes and carrier phases of the satellites in use

• performs channel and loop control

• performs position computation

• executes navigation software

• performs database management

• monitors self-test system status

• controls diagnostic LEDs: a red one which only lights up to indicate an error condition, and a green

one (the “heartbeat”) which blinks on and off at approximately 1 Hz to indicate normal operation.

• controls I/O functions

You configure the MiLLennium-GLONASS GPSCard using special commands (see Appendix D GLONASS Commands

and Logs on Page 34). In turn, the MiLLennium-GLONASS GPSCard presents inf ormation to you in the form of pre-

defined logs in a number of formats. In addition, when a MiLLennium-G LONASS GPSCard is linked to a NovAtel

GPSCard receiver or second MiLLennium-GLONASS GPSCard for differential positioning, they can communicate

directly through their serial ports.

Contents

Main Test Bed Receiver Subsystem Addendum Proprietary Notice TABLE OF CONTENTS Page TABLES Page FOREWORD SCOPE PREREQUISITES 1 INTRODUCTION THE NOVATEL TEST BED RECEIVER 1 - Introduction Test Bed Receiver Subsystem Addendum Rev 1 9 OPERATIONAL OVERVIEW L1/L2-I L1/L2-II GEO Processing Single Frequency GPS GLONASS Dual Frequency GPS GEO Other Outputs & Inputs 2 INSTALLATION OF TEST BED RECEIVER MINIMUM CONFIGURATION INTERNAL AND EXTERNAL OSCILLATORS CONNECTING THE EXTERNAL FREQUENCY REFERENCE CONNECTING DATA COMMUNICATIONS EQUIPMENT DCD RXD TXD DTR GND DSR RTS CTS NC CONNECTING THE GPS ANTENNA CONNECTING THE EXTERNAL POWER INPUT USING THE 10 MHz OUTPUT SIGNAL Page 3 OPERATION PRE-START CHECK LIST SERIAL PORTS - DEFAULT SETTINGS START-UP INITIAL COMMUNICATIONS WITH THE TEST BED RECEIVER 4 UPDATE OR UPGRADE YOUR GPSCARD UPGRADING USING THE $AUTH COMMAND UPDATING USING THE LOADER UTILITY TRANSFERRING FIRMWARE FILES USING THE LOADER UTILITY A WAAS OVERVIEW B GLONASS OVERVIEW MILLENNIUM-GLONASS GPSCARD X GLONASS SYSTEM DESIGN The Space Segment The Control Segment The User Segment TIME GLONASS TIME VS. LOCAL RECEIVER TIME DATUM FUNCTIONAL OVERVIEW MILLENNIUM-GLONASS GPSCARD SYSTEM Reference Description Reference Description GPS/GLONASS ANTENNA RADIO FREQUENCY (RF) SECTION DIGITAL ELECTRONICS SECTION Page C COMMANDS CONFIG IONOMODEL WAASCORRECTION LOGS RCCA RECEIVER CONFIGURATION D GLONASS COMMANDS AND LOGS GLONASS-SPECIFIC COMMANDS DGLOTIMEOUT Syntax: Options: PZ90TOWGS84 Syntax: Options: Example: PZ90TOWGS84 DEFAULT UNIMPLEMENTED COMMANDS GLONASS-SPECIFIC LOGS CALA/B CALIBRATION INFORMATION CALA Page CALB Format: Message ID = 87 Message byte count = 32 + (16 * 32) GALA/B ALMANAC INFORMATION GALA GALB Format: Message ID = 78 Message byte count = 112 GCLA/B CLOCK INFORMATION GCLA Table 2 Time Status Example: $GCLA,994,149871.00,10787,10.62179349,167.82950123,1121, -3.0544738044739E-007,9,4,00000000*7B,[CR][LF]GCLB GCLB Format: Message ID = 88 Message byte count = 68 GEPA/B EPHEMERIS INFORMATION GEPA Example: $GEPA,991,496487.00,991,495913.00,10787,4,12,83,0,-2.102581933593754E+007 GEPB Format: Message ID = 77 Message byte count = 156 Page OTHER NOVATEL LOGS RCCA RECEIVER CONFIGURATION E TEST BED RECEIVER - TECHNICAL SPECIFICATIONS Page Appendices 50 Test Bed Receiver Subsystem Addendum Rev 1 Default Channel Assignments INDEX