Presentation on theme: "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."— Presentation transcript:
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 a precise time anywhere on and in the vicinity of the Earth
13 Sat07_73.ppt, 2007-10-23. GPS Signal (II) L1: 154 x 10.23 MHz = 1.57542 GHz L2: 120 x 10.23 MHz = 1.22760 GPz Whar is the wave-length ? Modulated with P-Code: 10.23 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: 1.023 MHz = Ca. 300 m
15 Sat07_73.ppt, 2007-10-23. 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, 2007-10-23. 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 20 10 1cm 0.1 ppm 2 10 0.1 100 1
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