顾及卫星非圆轨道改正的GNSS精密测速方法

GNSS high precision velocity determination model considering satellite non-circular orbit correction

摘要: 详细推导了卫星非圆轨道改正的计算公式,给出高精度测速顾及该项误差的处理策略．采用全球均匀分布的12个国际GNSS服务（IGS）测站的多普勒和载波相位观测数据,仿动态评估了该项误差对测速精度的影响．结果表明:基于历元间载波相位差分的测速方法,改正后东、北、天顶方向分别提高8％、9％和10％,三维测速精度从9.9 mm／s改正到8.9 mm／s;基于原始多普勒的测速方法,东、北方向与载波相位差分方法的改正数值基本一致,天顶方向约是载波相位差分方法的改正数值的一半．

Abstract: The calculation formula of satellite non-circular orbit correction and the processing strategy of high-precision velocity determination considering this correction were introduced.Observations of 12 IGS stations distributed around the world were used to evaluate the influence of the correction.The results show that the accuracy of velocity determination method based on carrier phase difference improve by 8％, 9％ and 10％ in E, N and U after correction, respectively and the accuracy of three-dimensional velocity is corrected from 9.9 mm／s to 8.9 mm／s.For the raw Doppler velocity determination method, the correction values of E and N are the same as the carrier phase difference method,and the correction value of U is about half of the carrier phase difference method.