Navman 12 Designer's Manual page 4

4.5.2.2 Parallel acquisition ..........................................................................................................62
4.5.2.3 Adaptive threshold-based signal detection .....................................................................62
4.5.2.4 Overall search process ...................................................................................................62
4.5.3 Data collection .........................................................................................................................62
4.5.3.1 Ephemeris .......................................................................................................................62
4.5.3.2 Almanac ..........................................................................................................................62
4.5.3.3 UTC and ionospheric corrections. ........................................................................................62
4.6 Navigation ...................................................................................................................... 64
4.6.1 Geodetic datums ..................................................................................................................... 64
4.6.1.1 User selection of geodetic datums ..................................................................................64
4.6.1.2 User defined datums .......................................................................................................64
4.6.2 Platform class ......................................................................................................................... 65
4.6.2.1 Pedestrian .......................................................................................................................65
4.6.2.2 Automotive ......................................................................................................................65
4.6.2.3 Aircraft. ...........................................................................................................................65
4.6.3 Navigation cycle ...................................................................................................................... 65
4.6.3.1 State propagation ............................................................................................................65
4.6.3.2 Measurement processing ...............................................................................................65
4.6.3.3 Altitude processing .........................................................................................................65
4.6.3.4 Position pinning ..............................................................................................................65
4.6.3.5 Ground track smoothing. ................................................................................................66
4.6.4 Solution validity ....................................................................................................................... 66
4.6.4.1 Altitude measurement validity criterion ...........................................................................66
4.6.4.2 DGPS used validity criterion ...........................................................................................66
4.6.4.3 Number of satellites used validity criterion .....................................................................66
4.6.4.4. Maximum EHPE validity criterion ..................................................................................67
4.6.4.5 Maximum EVPE validity criterion ...................................................................................67
4.6.5 Mean Sea Level (MSL) ............................................................................................................67
4.6.6 Magnetic variation ....................................................................................................................67
4.7 Support functions .........................................................................................................67
4.7.1 Serial communication interfaces ..............................................................................................67
4.7.1.1 The host port ....................................................................................................................67
4.7.1.2 The auxiliary port .............................................................................................................68
4.7.2 EEPROM services .................................................................................................................. 68
4.7.3 RTC services ........................................................................................................................... 68
4.7.4 Differential GPS (DGPS) ......................................................................................................... 68
4.7.4.1 The RTCM protocol .........................................................................................................69
4.7.4.2 The RTCM message types ..............................................................................................69
4.7.4.3 Compliance with RTCM SC-I04 requirements ................................................................69
4.7.4.4 DGPS initialisation and configuration. ............................................................................69
4.7.4.5 Disabling DGPS operation .............................................................................................. 70
4.7.4.6 DGPS reset .....................................................................................................................70
4.7.4.7 DGPS status request ....................................................................................................... 70
4.7.5 Built-In Test (BIT) .....................................................................................................................70
4.7.5.1 Interpreting BIT results .................................................................................................... 70
Appendix A: Acronyms, abbreviations, and glossary ................................. 72
Appendix B: References ................................................................................. 76
APPENDIX C: NAVSTAR GPS operation ........................................................ 76
APPENDIX D: Frequently Asked Questions (FAQ) ....................................... 81
APPENDIX E: Reference ellipsoids and datum tables for Jupiter and
NavCore receivers ........................................................................................... 82
APPENDIX F: 2 x 10 pin field connector information ................................... 89
APPENDIX G: RG-142 and RG-316 Specifications ........................................ 89
Typical Specification for RG-316: ...................................................................................... 89
I. Electrical Characteristics: ............................................................................................................. 89
II. Physical Characteristics: ............................................................................................................. 89
measurement processor .............................................................................................................80
differential data processor ............................................................................................................................. 80
MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice. 4