双机协作无源定位测角精度计算

摘要

针对无源定位测角精度难以计算的问题提出了一种双机协作无源定位远距离目标测角精度计算方法.首先建立了基于到达角度方式的双机协作无源定位解析方程；其次通过引入波程差,建立了方位角信息与到达时间差之间的数学关系；接着给出了一种通过到达时间差的概率分布计算方位角概率分布的近似算法；最后进行了仿真试验,并分析了双机占位对测角精度的影响.仿真结果验证了所提测角精度计算方法的可行性和有效性.%An algorithmic method of calculating angle precision of remote target by dual - aircraft coordination passive locating way is performed. Firstly, with some proper hypotheses, an analytic equation of dual — aircraft coordination locating remote target based on Direction of Arrival (DOA) is set up. Then the mathematic relationship between azimuth angle and Time Difference of Arrival (TDOA) based on wavepath difference is established. And then, by using the method of Taylor Series, an approximate algorithm of calculating the azimuth angles probability distribution by calculating TDOAs probability distribution is presented. Finally, the affection of different dual -air-crafts position on angle precision is analyzed through simulation. The feasibility and the validity of the algorithmic method are demonstrated by the experiment.