飞行多点定位系统目标准确监测仿真

Target Accurate Surveillance Simulation in Flight Multilateration System

在利用多点定位系统监测民用航空飞行目标时,为保障飞行目标安全,需确保目标监测的准确性。传统方法是利用几何精度稀释因子(GDOP)来描述飞行多点定位系统目标监测的精度,但是GDOP是一个无纲量而不能直观准确地表达目标监测精度值或者范围。提出以多点定位位置精度不确定类别(MACp)来描述飞行多点定位系统目标监测精度的方法。首先根据飞行多点定位系统基站的几何分布和系统测量误差,推导出目标监测误差的协方差矩阵,得到监测误差容限概率、监测误差容限半径因子和监测误差协方差矩阵特征值比值三者之间的函数关系,获得在95%监测误差容限下的监测容限半径求解方法,对监测容限半径进行编码,即得到MACp值。相比于GDOP,MACp可以体现出在一定误差容限下飞行多点定位系统目标监测精度。仿真结果表明,MACp不仅能够体现GDOP对目标监测精度稀释的情况,还能更加准确描述多点定位系统的监测精度。

The paper proposes an algorithm which uses multi -lateration accuracy category for position （MACp） to describe light multi - lateration target surveillance accuracy. According to flight multi - lateration geometric distri- bution of base stations and system measuring error, a target positioning error covariance matrix was obtained, and then the functional relation between error tolerance probability, error tolerance radius ratio factor and the ratio of error co- variance matrix eigenvalues was deduced. Using 95% probability error margin of tolerance radius, a encode method was put forward to obtain MACp value. Compared with GDOP, MACp can reflect flight muhi - lateration target sur- veillance accuracy for a certain error margin. The simulation experimental results show that the MACp can not only reflect dilution of precision of target by GDOP, but also describe muhi - lateration surveillance accurate more exactly.