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Digital Satellite Navigation and Geophysics

Kayıt: 08 Ksm 2006
Mesajlar: 149

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Tarih: 16 02 2013 12:03

Digital Satellite Navigation and Geophysics
Methods of positioning with navigation satellites 1
1.1 Global and regional satellite navigation systems 1
1.2 Positioning tasks in navigation and geodesy 6
1.3 Reference coordinate systems 8
1.4 Timeframe and timekeeping 15
1.5 Accuracy, precision, and normal distribution 16
1.6 Principle of positioning with satellites and GNSS equations 19
1.7 Taylor theorem and linearization of GNSS equations 23
1.8 Least square estimation (LSE) 24
1.9 Integrity monitoring 30
1.10 Essentially nonlinear problems of positioning with GNSS 32
References 35
Presentations and applications of GNSS orbits 37
2.1 Development of models for celestial body movements from
Ptolemy to Einstein 37
2.2 Orbital movement description by Keplerian parameters 42
2.3 Orbit implementation in GPS navigation message 47
2.4 Ephemerides of GNSS satellites 48
2.5 Tabular orbits 51
2.6 Satellite clocks 55
2.7 Application of Keplerian almanac for constellation analysis 56
2.8 Force models 61
2.9 Where do all the satellites go? A satellite life cycle and space garbage
GNSS signal generation in transmitters and simulators 67
3.1 Spread-spectrum radio signals for satellite navigation 67
3.2 GNSS signal simulator 81
3.3 Case study: scenario data generation for airborne receiver 86
3.4 DIF signal generation in GNSS simulator 95
3.5 RF signal generation 97
3.6 Project: GPS signal simulation with bundled ReGen simulator
version 100
References 102
Exercises 103
Signal propagation through the atmosphere 104
4.1 Geometrical optics theory of radio signal propagation 106
4.2 GNSS ray bending in the Earth's atmosphere 108
4.3 GNSS signal phase and group velocity in the ionosphere 110
4.4 GNSS models of propagation in the ionosphere 113
4.5 Propagation in the troposphere 122
4.6 Modeling atmospheric errors in a receiver and in a simulator 124
4.7 Project 125
References 126
Receiver RF front end 127
5.1 RF front end for software GNSS receiver 127
5.2 Antenna 131
5.3 Front-end design 139
5.4 Front-end clock 139
5.5 Down-conversion 145
5.6 Analog-to-digital conversion 146
5.7 Project: recording live GNSS signals to PC 150
References 153
Exercises 154
Real-time baseband processor on a PC 155
6.1 Do we need all the receiver or just a baseband processor? 155
6.2 Operation in general 157
6.3 Acquisition 159
6.4 Tracking in a software baseband processor 166
6.5 Tracking and acquisition of other GNSS signals 175
6.6 Lock detectors 176
6.7 Bit synchronization 178
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Digital Satellite Navigation and Geophysics


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