Novatel OM-AD-0020 GALA/B ALMANAC INFORMATION , GALA

Appendices

Test Bed Receiver Subsystem Addendum – Rev 1 39

GALA/B ALMANAC INFORMATION

The GLONASS almanac reference time and week are in GPS time coordinates. GLONASS ephemeris information is

available through the GEPA/B log.

GALA

Structure:

$GALA week

seconds week tim e SVID freq health TlambdaN

LambadN

deltal ecc argperig deltaT deltaTD tau *xx [CR][LF]

Field # Field Description Example

1 $GALA Log Header $GALA

2 Week GPS Week, in weeks 991

3 Seconds GPS Time, in seconds 496470.59

4 Week GPS Week for almanac reference time (GLONASS time in GPS

format), in weeks 991

5 Time GPS Time for almanac reference time (GLONASS time in GPS

format), in seconds 374232.88

6 SVID Slot number for satellite, ordinal 16

7 Freq Frequency for satellite, ordinal 22

8 Health Ephemeris Health (1 = GOOD, 0 = BAD) 1

9 TlambdaN GLONASS Time of ascending node equator crossing, in seconds 3.94199E+004

10 Lambda N Longitude of ascending node equator crossing (PZ90), in radians -9.2257260E -001

11 Delta l Correction to nominal inclination, in radians 3.02841363E-002

12 Ecc Eccentricity 1.49440765E-003

13 ArgPer ig Argument of perigee (PZ90), in radians 1.04694189E-001

14 Delta T Offset to nominal orbital period, in seconds -2.6561113E+003

15 Delta T D Rate of orbital period, in seconds per orbital period 3.66210937E-004

16 Tau Clock offset, in seconds -2.0217896E-004*38

Example:

$GALA,991,496470.59,991,374232.88,16,22,1,3.94199E+004,-9.2257260E-001

3.02841363E-002,1.49440765E-003,1.04694189E-001,-2.6561113E+003,

3.66210937E-004,-2.0217896E-004*38

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