针对目前红警系统多站被动交会测距误差分析过程中,存在几何关系复杂、数学推导繁琐的缺点,提出一种多站被动测距的单项误差解析及总体精度判定方法.该方法基于平面投影的几何关系,对测距单项误差逐一进行推导,得到相应的解析表达,几何关系直观、物理意义明确.通过仿真计算,分析了单项误差对总体精度的影响,发现方位角误差是测距误差的主要来源,讨论了双站及三站被动测距相对误差分布的特点与规律.

Aiming at the drawbacks of complicated geometrical relationship and complex mathematical derivation in recent error analysis process of muti-station IRST passive ranging,this paper provides a method for analyzing individual error term and determining total accuracy in muti-station passive ranging.Based on geometrical relationship by planar projection,individual ranging error terms are derived one by one,and the corresponding analytical expressions are obtained subsequently.This method takes the advantages including direct view of geometrical relationship and clear physical meaning.By simulations,the effect of individual errors on the total ranging accuracy is analyzed.It is found that azimuth error is the main source of ranging error.The distribution character of relative ranging error is also discussed,especially for dual- and triple-station passive ranging.