GPS卫星钟差二次多项式预报模型的总体最小二乘算法

摘要

GPS Precise Point Positioning technology is the future development trend of GPS measurement technology. In which, the satellite orbit prediction and clock forecasting is the key of the technology. Nowdays, IGS could provide short-term high-precision satellite orbit prediction, but the clock is still poor forecasting can not achieve real-time positioning requirements, therefor the satellite clock error prediction model is particularly important to establish sufficient accuracy. In this paper, based on common quadratic polynomial short-term forecasting model, a new parameter estimation method - total least squares estimation have been put forward, and draw over the forecast accuracy of the method of least squares parameter estimation forecast higher accuracy results.%GPS精密单点定位技术是今后GPS测量技术的发展趋势，其中，卫星轨道预报与钟差预报是该技术的关键。如今，IGS组织已能够提供短时高精度的卫星轨道预报，但在钟差预报方面尚无法达到实时定位的要求，所以建立足够精度的卫星钟差预报模型尤为重要。文章根据常用的二次多项式短期预报模型，提出新的参数估计方法---总体最小二乘估计，并得出该方法能进一步提高二次多项式模型预报精度的结论。