多站式时差定位系统的误差空间分布特性

Error Space Distribution Character of Multiple Station Location System

在设备误差、人为误差稳定的情况下,多站式时差定位系统在某些特定区域会出现明显的大误差,针对三站式、四站式无源时差定位系统,利用计算机,结合数值模拟和解析式分析,对时差定位系统的误差空间分布特性进行研究.结果表明三站式时差定位系统的误差空间分布具有指向性,误差空间分布收到三个站点构成的三角形几何特性的影响;四站式时差定位系统的定位低精度区域符合特定的双曲线,这一双曲线可在解算方程的系数矩阵不满秩时导出,双曲线方程受到站点位置影响.

In the case of the equipment error and human error are stable,the multi-station time difference location system could have clear location error in some specific areas.Aimed at 3-station、4-station time difference location system,we make a research of the error space distribution with the help of computer.It shows that the error space distribution of 3-station time difference location system has directivity,and it is effected by the geometry of the triangle composed of three sites.the low error area of 4-station time difference location system match some hyperbola which could be derivate when the coefficient matrix of the equation set is not full rank.The hyperbola is influenced by the station location.