Present and Future Global Navigation Satellite Systems (GNSS)
GEO2TECDI_GPS_2.pdf
GEO2TECDI_GPS_2.pdf
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GEOCENTER<br />
Principle of one-way ranging:<br />
<strong>Satellite</strong> clock generates signal<br />
Receiver clock detects signal arrival<br />
Pseudo Range<br />
∆t<br />
P I<br />
j<br />
= c ∆t = || r I -r j ||<br />
Carrier Phase<br />
Code arriving from satellite<br />
Replica generated in receiver<br />
Time delay (Pseudo<br />
Range measurement)<br />
Doppler shifted carrier from satellite<br />
Carrier generated in receiver<br />
Carrier beat signal<br />
GPS measurements<br />
PROBLEM:<br />
The two clocks must keep the same time<br />
P I<br />
j<br />
= -λϕ i<br />
j<br />
= || r I -r j || - λA i<br />
j<br />
14<br />
GEO2TECDI – Bangkok, May, 2009 – <strong>GNSS</strong> Lecture 2
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