一种改进的北斗导航卫星伪距码偏差建模方法

基于多路径组合观测值分析了中国北斗卫星导航系统存在的伪距码偏差特性。针对现有的伪距码偏差修正模型,提出了一种改进的建模方法。利用历元间单差MP组合观测值对倾斜地球同步轨道卫星(IGSO)和中轨卫星(MEO)中每颗卫星的伪距码偏差分别进行建模。最后通过HMW组合观测值对各修正模型进行评估,比较和分析了不同修正模型的表现。结果表明:对于北斗IGSO和MEO卫星,改进后的修正模型相比于已有的模型在修正码偏差上平均提升约20%;在部分卫星和高度角上提升程度平均可以达到30%。

An improved modeling method of BeiDou navigation satellites code pseudorange bias

Based on the multipath combined observations, this paper analyzed the characteristics of the codes pseudorange bias existing in China Beidou satellite navigation system. Aiming at the existing model of correction for the codes pseudorange bias, an improved modeling method was proposed. Using the single-difference MP combination observations between epochs, Satellite"s code pseudorange bias were modeled separately. Finally, the modified model was evaluated by using HMW observations, and had been compared and analyzed with the performance of different modified models. The results show that the performance of the modified model on modified code pseudorange bias can be enhanced by about 20%, compared with existing models, and the enhancement can reach an average of 30% in some satellites and elevation angle.