一种基于伽利略搜救系统的联合定位算法

分析了伽利略搜救系统的地面站定位模型。提出了一种适用于该系统的，在存在多余观测的情况下，基于信号的时间延迟和多普勒频率测量值加权后，共同参与平差计算的联合定位算法模型及其误差分布模型。仿真结果表明，与单纯使用一种观测值的定位算法相比，该算法可以提高定位精度，是一种适合伽利略搜救地面站使用的定位算法。

A Combine Localization Algorithm Based on SAR/Galileo System

With analysis of the localization model of Galileo SAR(Search and Rescue Mission on Galileo system) local user terminal,this paper proposed a localization algorithm to take advantage of the measurement diversity and the redundant measurements available for the terminal in most cases.The algorithm combines weighted time delay measurements and weighted Doppler frequency shift while deriving square error,and seeks the unique root of localization equations that minimize the square error.The estimate that evaluates the accuracy of above localization algorithm is also derived.Simulation results indicate that the algorithm achieves much higher precision than algorithms that utilize only single type of observations.