基于卫星外辐射源的双站时差定位方法

Two-station TDOA localization algorithm based on satellite external illuminators

针对基于卫星外辐射定位的单站二维测向时差、三站时差定位模型存在定位精度低、系统设备复杂的问题,设计了一种限定约束条件双站时差定位模型,利用目标平台先验信息,将目标高度信息引入地球位置方程,代替定位模型中时差方程,将三站时差定位方程降维处理,解决双站受测量条件制约无法建立有效的定位方程问题,利用牛顿迭代处理方法完成目标位置解算,得到限定条件下高精度目标位置。试验结果表明,时差、定位站间距和卫星轨道误差等参数对定位精度影响较小,各个参数相对定位精度均优于0.2%R,该定位方法具有较好的工程推广价值。

Aiming at the problems of low positioning accuracy and complex system equipment of two-dimensional direction finding time difference of single station and three station time difference location model based on external satellite radiation positioning. We design a limit constraints time difference of two station location model. using a priori knowledge about the target height information is introduced into the earth position equation, instead of positioning time difference in the model, the three station time difference equation dimension, solve the two station is conditioned by measuring condition unable to establish an effective positioning equation problem, using Newton iterative method to solve the target position. The high precision target position is obtained under limited conditions. The experimental results show that the parameters such as time difference, distance between station and satellite orbit error have little influence on the positioning accuracy, and the relative positioning accuracy of each parameter is better 0.2%R. This positioning method has good application value in engineering.