GPS定位中对流层折射估计研究

THE ESTIMATION METHODS FOR TROPOSPHERIC DELAYS IN GLOBAL POSITIONING SYSTEM

本文首先讨论了ＧＰＳ相对定位中的对流层折射估计的单参数方法、多参数方法、分段线性方法和随机过程方法。论证了其它方法都是随机过程方法的近似。为了用随机过程模拟对流层折射，建立了一种最小二乘递推算法。在此基础上，在ＧＡＭＩＴ软件中统一实现了以上各种对流层折射估计方法。

The estimation methods for the tropospheric delays in relative positioning using GPS, such as the single parameter method, the multi parameter method, the piecewise linear method and the stochastic method are discussed firstly. Then it is demonstrated that the other methods are all the approximation of the stochastic method. For the stochastic estimation of the tropospheric zenith delays, a special least square sequential algorithm is established, and all the forenamed mehtods are realised in the GAMIT software using the sequential algorithm. Finally, the results obtained by the different methods are presented and analysed.