基于几何精度衰减因子的单站无源定位精度分析方法

A Precision Analysis Method of the Fixed Single Observer Passive Location Based on Geometric Dilution of Precision

基于固定单站测量到达时差(TDOA)是一种有效的无源定位方法。针对现有文献缺乏对该方法定位精度的分析研究,提出一种基于几何精度衰减因子(GDOP)的定位精度分析方法。该方法首先提取影响TDOA定位精度的测量因子;然后分别以这些因子作为输入变量,根据GDOP,得到相对定位误差与影响定位结果的参数测量误差之间的变化关系以及可观测区域;最后再确定能否满足具体工程项目的定位精度和定位稳定性标准。仿真实验结果表明:该定位精度分析方法能够全面地评估方向到达时差(TDOA)的应用价值。通过该精度分析方法的验证,测量TDOA的固定单站无源定位方法具备较高的实用价值。

The location method based on FSOPL（fixed single observer passive location） using time of difference of arrival（TDOA） measurements was effective,but there＇s no existing articles on the research of location precision analysis.Aiming at this situation,a method based on the geometric dilution of precision（GDOP） was put forward.Firstly,the parameters that influenced location precision were pulled;Then separately took them as the input to deduce the GDOP formula,the shifty relation between the relative location error and the measurement error of parameters was obtained,meanwhile,the observable areas were gained,then,it was made sure that whether this location method could satisfy the concrete project level of location precision and stability.The computer simulations showed that this location accuracy analysis method could generally estimate the application value of TDOA.