1 Sat07_73.ppt, 2007-10-23. GPS Definition. Precise satellite navigation-system, which after 1993 will give users a 3-D position and velocity as well as.

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Presentation transcript:

1 Sat07_73.ppt, GPS Definition. Precise satellite navigation-system, which after 1993 will give users a 3-D position and velocity as well as a precise time anywhere on and in the vicinity of the Earth

2 Sat07_73.ppt, GPS /

3 3 SEGMENTS: Space-segment Control-segment User-segment

4 Sat07_73.ppt, GPS, Configuration /

5 Sat07_73.ppt, GPS Constallation 18 satellites and 4 reserve in 6 planes Lifetime: 7.5 years 6 planes, 60 0 separated Inclination: 55 0 Semimajor axis: km Period: 11 hours 58 min

6 Sat07_73.ppt, Satellitbaner GPS, i= 55 0.

7 Sat07_73.ppt, GPS satellite

8

9 Sat07_73.ppt, GPS, Observation principle

10 Sat07_73.ppt, GPS signal

11 Sat07_73.ppt, GPS position and velocity determination.

12 Sat07_73.ppt, GPS signal

13 Sat07_73.ppt, GPS Signal (II) L1: 154 x MHz = GHz L2: 120 x MHz = GPz Whar is the wave-length ? Modulated with P-Code: MHz = ca. 30 m, Repeated after 266 days = 7 days for 1 satellite Zero at 0.0 UT Saturday/sunday Only L1 modulated with C/A code: MHz = Ca. 300 m

14 Sat07_73.ppt, Satellite-orbits– orbit changes. 16 parameters, Updated every hour

15 Sat07_73.ppt, Satellite orbit parameters for GPS Mean-anomali Mean-anomaly change Excentricity Square-root semimajor axis Rectacensionen Inclination at t 0e Perigæums argument Tidsændring af rectac. Time-change of i Corection of f+ Correction of r Reference-time /

16 Sat07_73.ppt, Satellite orbit error - relative positioning Influence of orbit-error on position determination Reduced if we determine difference-vector Relativ precision: db/b dr (m) b(km) db 1 ppm cm 0.1 ppm

17 Sat07_73.ppt, GPS, error-sources.

18 Sat07_73.ppt, Differentiel GPS

19 Sat07_73.ppt, GPS, position-error.