基于卫星外辐射源的高精度单站定位方法

Single Station Positioning Algorithm with High Precision to The External Emitter Based on Satellite

目前基于卫星外辐射源多采用单站二维测向时差、多站时差定位体制,定位系统复杂,实际工程应用场景受限。为此提出了一种限定约束条件的单站测向时差定位方法,该算法利用侦测目标活动区域的先验信息,实现目标二维方向方程的降维处理,解决单站定位受测量条件制约无法建立有效的定位解算方程问题,并通过牛顿迭代处理实现定位方程有效解算,得到约束条件下更精确的目标位置。推导出该定位模型的定位克拉美罗界(CRLB),并对该定位模型进行了仿真试验,确认该种定位体制的定位精度和可行性,具有较好的工程应用价值。

At present,the external emitter positioning system based on satellites mainly uses single-station 2D direction-finding(DF)time difference positioning and multi-station time difference positioning.These positioning algorithms are complex and have limitation in practical engineering applications.To solve above problems,this paper proposes a positioning algorithm of single station DF time difference with limited condition.The algorithm uses the priori information of the target active region to realize the dimension reduction processing of the target’s 2D direction equation,so as to solve the difficulty establishing an effective positioning equation for single station positioning which is limited by the measurement condition,and the algorithm uses Newton iteration to realize the effective resolution of positioning equation,so more accurate target position under the constrained condition is fetched.The paper also deduces the Cramer-boundary of the positioning model,and performs the simulation test.The simulation results show the accuracy and feasibility of the proposed positioning system,and good engineering application value is also demonstrated.