Novatel OM-AD-0020 CONNECTING THE EXTERNAL FREQUENCY REFERENCE

2 - Installation

Test Bed Receiver Subsystem Addendum – Rev 1 13

command is disabled, or if the EXTERNAL clock command is disabled, then the two receivers will drift away from each

other in time. The normal mode of operation is to use either the internal OCXO or a highly stable external oscillator.

The 10 MHz OCXO is mounted within the enclosure on the Clock/Status card. This card has bi-colored LEDs that

visually indicate when the receiver is powered and also reflect whether the receiver has passed its power on self-test. The

lower LED will monitor the signal power of the internal 10 MHz OCXO. If it turns from green to off a failure of the

OCXO or its power supply would be indicated. Only the first, second and third LED from the bottom are used. The

others are only active when the enclosure is populated as a WAAS, MSAS, or EGNOS RIMS-C receiver.

CONNECTING THE EXTERNAL FREQUENCY REFERENCE

The Test Bed Receiver can be used with an external, user-supplied frequency reference; this would typically take the

form of a high-accuracy oscillator. Please refer to Appendix B for the recommended specifications of this device.

The frequency reference is connected to the 10 MHz BNC female connector on the rear panel of the Test Bed Receiver.

Refer to Figure 5 below.

Figure 5 10 MHz In (External Frequency Reference) - Test Bed

The 11th (bottom) LED on the front panel indicates the status of the internal clock r efere nce. A clear LED indicates that

no internal reference is present. Green indicates that the clock is present. Refer to Figure 6 below.

Figure 6 Lights on Front Panel of Test Bed Receiver

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