陈德忠, 叶世榕, 刘炎炎, 刘郑. 基于观测值域的GPS多路径误差应用分析[J]. 武汉大学学报 ( 信息科学版), 2014, 39(2): 147-151. DOI: 10.13203/j.whugis20120719
引用本文: 陈德忠, 叶世榕, 刘炎炎, 刘郑. 基于观测值域的GPS多路径误差应用分析[J]. 武汉大学学报 ( 信息科学版), 2014, 39(2): 147-151. DOI: 10.13203/j.whugis20120719
CHEN Dezhong, YE Shirong, LIU Yanyan, LIU Zheng. Applied Analysis of GPS Multipath Errors Based on Observation Domain[J]. Geomatics and Information Science of Wuhan University, 2014, 39(2): 147-151. DOI: 10.13203/j.whugis20120719
Citation: CHEN Dezhong, YE Shirong, LIU Yanyan, LIU Zheng. Applied Analysis of GPS Multipath Errors Based on Observation Domain[J]. Geomatics and Information Science of Wuhan University, 2014, 39(2): 147-151. DOI: 10.13203/j.whugis20120719

基于观测值域的GPS多路径误差应用分析

Applied Analysis of GPS Multipath Errors Based on Observation Domain

  • 摘要: 目的 基于观测值域双差残差恒星日滤波方法消除多路径误差,利用事先计算的前一天观测卫星双差残差并进行去噪处理,根据各自卫星周日重复性改正到第二天对应时刻的双差观测方程中,得到剔除多路径误差后的“干净”双差观测值,最后解算基线信息。试验结果表明,与常规基于坐标域恒星日滤波相比,该方法在平面方向的精度可提高23%,且高程方向也有一定程度的提高。

     

    Abstract: Objective Multipath must be eliminated as an important error source when improving relative positio-ning accuracy of GPS short baseline in practical deformation monitoring engineering such as for dams、high-rise buildings and big bridges.In this study,a new sideral algorithm based on a double residualin the GPS observation domain is proposed to mitigate mutipath errors.We calculated residuals for alldouble observations after resolving ambiguity while denoising those residuals for the first day.Theseresults were taken as a multipath model to remove the mutipath errors from the double difference ob-servation equations of the subsequent day by taking advantage of sidereal repeatability of every satel-lite.Clean double observations without multipath errors could be extracted,and a better baseline co-ordinate sequence was consequently calculated.The results show that this new method not only doeswell in the vertical precision but also reduces the root mean squre(rms)in horizontal coordinate preci-sion by 23%,as compared with traditional sidereal filter.

     

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