Novatel OM-20000053 Rev 2 APPENDICES

4 MiLLennium GPSCard SW Version 4.52 Command Descriptions Manual Rev 2
4 Message Formats 46
4.1 RTCA-Format Messages............................................................. .... .... ................................................46
RTCA Standard Logs...................................................................................................................47
4.2 RTCM-Format Messages...................................................................................... ... .... .......................48
RTCM General Message Format.................................................................................................49
RTCM Standard Commands........................................................................................................50
RTCM Standard Logs..................................................................................................................50
4.3 CMR Format Messaging.....................................................................................................................56
Using RT-2 or RT-20 with CMR Format Messages....................................................................57
4.4 RINEX Format.................................................................................................. ..................................57
4.4.1 Commands...........................................................................................................................58
4.4.2 Logs.....................................................................................................................................59
APPENDICES
A GPS Overview 63
A.1 GPS System Design...........................................................................................................................63
The Space Segment......................................................................................................................63
The Control Segment....................................................................... .... .... .....................................64
The User Segment........................................................................................................................64
A.2 Height Relationships..........................................................................................................................64
A.3 GPS Positioning.................................................................................................................................65
Single-point vs. Relative Positioning.......................................................................................... .66
Static vs. Kinematic Positioning..................................................................................................67
Real-time vs. Post-mission Data Processing................................................................................67
Differential Positioning................................................................................................................67
Pseudorange Algorithms..............................................................................................................68
Pseudorange Differential Positioning...........................................................................................68
Dual Station Differential Positioning...........................................................................................71
A.4 Carrier-Phase Algorithms...................................................................................................................73
B Multipath Elimination Technology 75
B.1 Multipath............................................................................................................................................75
Why Does Multipath Occur?........................................................................................................75
Consequences of Multipath Reception.........................................................................................76
B.2 Hardware Solutions For Multipath Reduction...................................................................................76
Antenna Site Selection.................................................................................................................76
Antenna Designs...........................................................................................................................77
Antenna Ground Planes................................................................................................................78
NovAtel’s Internal Receiver Solutions for Multipath Reduction.................................................79
C Commands Summary 81
ACCEPT.......................................................................................................................................81
ANTENNAPOWER.....................................................................................................................83
ASSIGN........................................................................................................................................84
CLOCKADJUST..........................................................................................................................85
COMn...........................................................................................................................................86
COMn_DTR.................................................................................................................................86
COMn_RTS..................................................................................................................................87
CONFIG.......................................................................................................................................88
CRESET.......................................................................................................................................89
CSMOOTH..................................................................................................................................90
DATUM.......................................................................................................................................91
DGPSTIMEOUT..........................................................................................................................92
DIFF_PROTOCOL......................................................................................................................93