抗差方差分量估计在GPS/GLONASS组合导航中的应用

摘要

运用GPS/GLONASS组合导航时,由于卫星系统的测距精度不同,需要在组合解算中采用方差分量估计进行合理定权和平差计算.但是,当GPS和GLONASS观测值中含有粗差时,若采用最小二乘方差分量估计则无法抵抗粗差的影响,从而降低平差结果的精度和可靠性.为了提高GPS/GLONASS组合解算的抗差性,本文引入了基于IGGⅢ等价权函数的抗差估计方法,经过对GPS/GLONASS实测数据的计算和分析,证明这是一种可行的和有效的方法.%When using the GPS/GLONASS combined navigation,the reasonable fixed weight and adjustment calculation should be carried on in the combined solution by variance component estimation due to the different location precision of satellite system.However,it is unable to resist the influence of gross error by using the least squares estimation of variance components,if the GPS,GLONASS observations contain gross errors and it will reduce the accuracy and reliability of the adjustment results.The robust estimation inethod based on IGGⅢ equivalent weight function was introduced in this paper.Calculation and analysis of the measured data for GPS / GLONASS proved that this was a feasible and effective method.