刘志强, 岳东杰, 王虎, 郑德华. 顾及码频间偏差的GPS/GLONASS实时卫星钟差估计[J]. 武汉大学学报 ( 信息科学版), 2017, 42(9): 1209-1215. DOI: 10.13203/j.whugis20150542
引用本文: 刘志强, 岳东杰, 王虎, 郑德华. 顾及码频间偏差的GPS/GLONASS实时卫星钟差估计[J]. 武汉大学学报 ( 信息科学版), 2017, 42(9): 1209-1215. DOI: 10.13203/j.whugis20150542
LIU Zhiqiang, YUE Dongjie, WANG Hu, ZHENG Dehua. An Approach for Real-Time GPS/GLONASS Satellite Clock Estimation with GLONASS Code Inter-Frequency Biases Compensation[J]. Geomatics and Information Science of Wuhan University, 2017, 42(9): 1209-1215. DOI: 10.13203/j.whugis20150542
Citation: LIU Zhiqiang, YUE Dongjie, WANG Hu, ZHENG Dehua. An Approach for Real-Time GPS/GLONASS Satellite Clock Estimation with GLONASS Code Inter-Frequency Biases Compensation[J]. Geomatics and Information Science of Wuhan University, 2017, 42(9): 1209-1215. DOI: 10.13203/j.whugis20150542

顾及码频间偏差的GPS/GLONASS实时卫星钟差估计

An Approach for Real-Time GPS/GLONASS Satellite Clock Estimation with GLONASS Code Inter-Frequency Biases Compensation

  • 摘要: 在进行GPS/GLONASS联合卫星钟差估计时,GLONASS码频间偏差(inter-frequency bias,IFB)因卫星频率间的差异而无法被测站接收机钟差参数吸收,其一部分将进入GLONASS卫星钟差估值中。通过引入多个"时频偏差"参数(inter-system and inter-frequency bias,ISFB)及附加基准约束对测站GLONASS码IFB进行函数模型补偿,实现其与待估卫星钟差参数的有效分离,并对所估计实时卫星钟差和实时精度单点定位(real-time precise point positioning,RT-PPP)进行精度评估。结果表明,在卫星钟差估计观测方程中忽略码IFB,会明显降低GLONASS卫星钟差估值精度;新方法能有效避免码IFB对卫星钟差估值的影响,所获得GPS、GLONASS卫星钟差与ESA(European Space Agency)事后精密钟差产品偏差平均均方根值分别小于0.2 ns、0.3 ns。利用实时估计卫星钟差进行静态RT-PPP,当观测时段长为2 h时,GPS单系统、GPS/GLONASS组合系统的3D定位精度优于10 cm,GLONASS单系统3D定位精度约为15 cm;三种模式24 h单天解的3D定位精度均优于5 cm。

     

    Abstract: In GPS/GLONASS satellite clock estimation, GLONASS code inter-frequency biases (IFB) can not be assimilated into the receiver clock parameters due to the discrepancy of GLONASS frequencies, which is partly involved in the GLONASS satellite clock estimates. In order to separate the GLONASS IFBs and the satellite clock estimates effectually, an approach for real-time GPS/GLONASS satellite clock estimation with multiple inter-system and inter-frequency bias (ISFB) parameters and additional restriction is proposed. The estimated satellite clocks and real-time precise point positioning results are then evaluated. The results show that ignoring GLONASS code IFBs could dramatically degrade the GLONASS satellite clock accuracy. The new approach can efficiently avoid the adverse impact of GLONASS code IFBs on satellite clock estimates. Compared with the ESA final satellite clock products, the average RMS of clock biases are less than 0.2 ns for GPS and 0.3 ns for GLONASS respectively. RT-PPP experiments were conducted with different session lengths. The 3D positioning accuracy of RT-PPP using the estimated satellite clocks was better than 10 cm for GPS-only and combined GPS/GLONASS modes, 15 cm for GLONASS-only mode with 2-h observations, and better than 5 cm for all the three modes with 24-h observations.

     

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