一种基于椭球模型的三星时差定位的精度分析

Accuracy analysis of Samsung time difference location based on ellipsoid model

为了对三星时差定位系统的定位误差进行标校,首先,利用目标福射的信号到达各观察站的时间差和椭球模型组成定位方程组并通过解方程组进行定位;然后,建立定位模型并计算几何精度;最后,在测量误差和卫星高度不改变的情况下,改变卫星的位置,得到各个卫星构型下定位精度的仿真结果并提出最佳构型,统计分析主星与辅星连线夹角对定位精度的影响。结果表明:卫星构型的优化能够提高三星时差定位的精度。

In order to calibrate the positioning error of the three-star time difference positioning system. Firstly, the positioning equations are formed by using the time difference between the signals of the target radiation and the ellipsoid model to reach the observation stations, and positioning is performed by solving the equations;Then, establish a positioning model and calculate the geometric accuracy;Finally, the position of the satellite is changed without the measurement error and the satellite height being changed, and the simulation results of the positioning accuracy for each satellite configuration are given. According to the positioning accuracy of different satellite configurations, the optimal configuration is proposed, and the influence of the connection angle between the main and auxiliary stars on the positioning accuracy is statistically analyzed under this satellite configuration. The results show that the optimization of satellite configuration can improve the accuracy of Samsung’s time difference positioning.