抗差Helmert方差分量估计在精密单点定位中的应用  

Applications of robust Helmert variance component estimation to PPP

作　　者：蒋光伟[1] 涂锐[2] 

机构地区：[1]国家测绘局大地测量数据处理中心,西安710054 [2]长安大学地质工程与测绘学院,西安710054

出　　处：《测绘科学》2011年第6期187-188,共2页Science of Surveying and Mapping

摘　　要：在精密单点定位技术中,伪距与载波相位在两者权比一般为固定常数,这与实际不符。由于伪距和载波两类观测值的精度不一致,因此合理的定权是提高定位精度的关键。同时,当观测值中含有粗差时,将使定位结果严重失真。本文将抗差Helmert方差分量估计引入中,采用IGS站bjfs站的实测数据进行定位,结果表明,抗差Helmert方差分量估计既较好地解决了观测值的合理定权问题,又有效地减弱了粗差的影响,从而提高了定位精度。In the precise point positioning, the proportion of weights for two kinds of observations is a constant during the computation. It is inconsistent with the fact because the precision of the pseudo-range and carrier observations are different. While the observations, contaminated by the gross error, will distort the position result. This paper used the Robust Helmert Variance Component Estimation to adjust the proportion of weights between phase observations and pseudorange observations. Through the test, the result implied that Robust Helmert Variance Component Estimation could effectively resolve the proportion of observations weights and degrade the gross outlier effects to the position and improve the position accuracy.

关 键 词：抗差估计 Helmert方差分量 精密单点定位 

分 类 号：P228.41[天文地球—大地测量学与测量工程]