国产单北斗接收机多路径误差建模与性能评估

Application and performance evaluation of multipath error modeling based on domestic single BeiDou receiver

针对提升单北斗应用模式下服务性能相对其他卫星导航系统核心竞争力的问题,直接利用双差观测值残差提取尽可能精确的多路径误差观测信息,采用半天球格网点建模方法得到了多个北斗地基增强站点的多路径误差改正模型。通过与“零基线”模式布设的多系统接收机测试结果进行对比,验证了利用全国产单北斗接收机设备,开展多路径误差建模的应用有效性。测试结果表明,采用新一代国产单北斗接收机,可获得较现有国产多系统接收机性能基本一致的应用服务效果。对于本文测试算例,在进行北斗系统多路径模型改正后,其载波相位双差观测值残差的RMS均值,由2.29 cm降低为1.53 cm,精度改善率达到了33.0%。该测试结果验证了采用国产单北斗接收机设备,在现有北斗地基增强服务中,开展多路径误差建模的应用有效性和潜在的工程化推广价值。

Regarding the issue of improving the core competitiveness of service performance relative to other satellite navigation systems under the single Beidou application mode.This paper directly utilizes the residual of double-difference observations to extract as precise multi-path error observation information as possible,and adopts the method of multi-point hemispherical grid model(MHGM)to obtain the multi-path error correction model for BeiDou ground-based augmentation stations.By comparing with the test results of multi-system receivers deployed in the“zero baseline”mode,the effectiveness of using domestically produced single BeiDou receivers to carry out multi-path error modeling is verified.The test results show that using the new generation domestically produced single BeiDou receiver can achieve application service effects that are basically consistent with the performance of existing domestically produced multi-system receivers.In the test cases of this paper,after correcting the BeiDou system multipath model,the RMS value of carrier phase double-difference observation residuals decreased from 2.29 cm to 1.53 cm,achieving an accuracy improvement rate of 33.0%.These test results verify the effectiveness and potential engineering application value of using domestically produced single BeiDou receiver equipment for multipath error modeling in existing BeiDou ground-based augmentation services.