一种基于泰勒级数展开的卫星FDOA地面干扰源定位算法

A Location Algorithm of Ground Interference Sources Using Satellites FDOA Measurements Based on Taylor Series Expansion

对未知干扰源准确定位一直是卫星管理控制中需要解决的关键难题之一,利用干扰信号到达卫星时所携带的多普勒频移信息进行定位是一种有效的解决方法。利用受干扰卫星和其相邻卫星间的信号到达多普勒频差(FDOA),在干扰源位于地球表面约束的条件下,建立干扰源的定位模型,提出一种基于泰勒级数展开的干扰源定位算法,并对算法的性能进行了详细分析。仿真结果表明,该算法收敛速度快,能接近克拉美罗下限,约束条件的引入可以有效增加定位精度,减少有效定位最小观测卫星的数目。

How to locate the unknown interference sources accurately is always a key technical problem for satellite operation systems.An effective method is to use the Doppler frequency shift when the interference signal arrives at the satellite for location.This paper first utilizes the frequency difference of arrival between the interfered satellite and its adjacent satellite to establish the location model.Then a location algorithm based on Taylor series expansion with earth constraint is proposed.At last,the performance of the proposed algorithm is analyzed in detail.Simulation results show that the proposed algorithm can achieve the CRLB and has a fast convergence speed.The introduction of earth constraint could improve the locating accuracy or reduce the least number of needed satellites in the location system.