基于外辐射源的高精度目标定位方法

A Method of High-Precision Target Location Based on External Illuminators

针对传统外辐射源雷达定位精度严重依赖测向及测距误差的问题,提出了基于多接收站的高精度目标时差定位方法。并提出了一种改进的极大似然估计算法,该方法解决了极大似然估计法的初值选择问题,能够实现水平定位和高度精确估计。仿真结果证明了所提方法的合理性和改进算法的有效性。结果表明,利用该方法的目标定位精度与克拉美罗下界非常接近,目标水平定位精度可达10m量级,测高精度可达100m量级。

The accuracy of traditional target location based on external illuminators depends on the performance of angle and range estimation.A method of multi-station based on high-precision target location and a hybrid Maximum Likelihood method,which can be used to estimate location and height,are proposed.The selective problems for Maximum Likelihood method could be solved with this method.Simulation results show that the mean square errors of the hybrid Maximum Likelihood method are close to Cramer-Rao Lower Bound.The2-D location accuracy can be improved up to10m and the height estimation accuracy can be lift up to100m.