GPS Satellite Velocity and Acceleration Determination using the Broadcast Ephemeris

摘要: Satellite velocity determination using the broadcast ephemeris is discussed and it pointed out that conventional rotation matrix method involves a complicated process of computation. This paper proposes an alternative simple differentiator to derive satellite Earth-Centred-Earth-Fixed (ECEF) from ECEF positions are calculated standard ICD-GPS-200 algorithm. The proposed algorithm simplifies transformation procedure, therefore provides good alternative. It demonstrated t1 mm/s per axis achievable by first-order central difference Taylor series approximation. A closed-form formula also derived for GPS acceleration ephemeris. capable accuracies better than t0 . 1 mm second squared in each axis. With such high accuracy real-time, possible detect line-of-sight range precisely as concluded receiver can be considered precise accelerometer. success position differential implies real-time velocities directly through numerical differentiation polynomials. desirable applications which require output rate results real-time. would benefit those who attempt use accurate accelerometer