GNSS系统时间偏差监测精度改善及评估
发布时间：2019-03-29 14:24
【摘要】：随着卫星导航应用的普及与发展，当前全球卫星导航系统GNSS主要包括GPS、GLONASS、Galileo以及BDS。多模导航是未来卫星导航领域的发展方向，其优越性越来越被人们所认识到。多模导航需要解决的焦点问题之一就是系统时间的兼容与互操作。 针对此问题，本文开展了基于接收空间信号实现GNSS系统时差监测方法的研究，并在研究系统时差监测原理及各项误差分布的基础上进行监测精度改善与评估。论文的主要研究成果如下： 1.分析了系统时差监测原理，研究了影响监测精度的各项误差特点及其分布规律，对一般系统时差监测精度进行了定量评估。 2.在已建成的GNSS系统时差监测平台的基础上，研究并实现了接收机端GLONASS频间偏差以及GPS/GLONASS接收机内部系统间通道延迟偏差的测量，并设计实验对测量结果进行了验证。结果表明：GLONASS频间偏差在ns量级，并跟随频率号的增加呈线性趋势。对于Septentrio PolaRx4接收机而言，GPS与GLONASS系统之间存在7.04ns的内部通道延迟偏差。考虑GLONASS频间偏差和GPS/GLONASS接收机内部系统间通道延迟偏差可以有效改善定位结果与系统时差监测精度。 3.利用IGS提供的GPS、GLONASS精密星历对GNSS系统时差监测结果进行事后修正，改善监测精度。修正后UTC(NTSC)-GPST的监测结果RMS值降低了将近2ns。研究了利用IGS TEC MAP计算电离层时延以及双频实测电离层时延两种不同处理方法对GNSS系统时差监测结果的影响。结果表明：利用双频实测电离层时延相对于利用IGS TEC MAP计算电离层时延，，UTC(NTSC)-GPST监测结果准确性提高了30%左右。 4.对系统时差监测结果的准确性进行了测试评估。设计了与不同机构监测结果互比、与用户级处理结果比对以及多系统导航应用三种评估方法，通过实际实验验证了GNSS系统时差监测结果的准确性。 5.研究了系统时差的使用方法。针对多系统导航用户的使用特点，基于GNSS系统时差监测与预报平台的搭建，研究了GNSS系统时差辅助多模导航的方法并对其做了实验验证。结果表明：系统时差辅助多模导航可以提高系统的可用性、改善定位精度、提高导航性能。
[Abstract]:With the popularization and development of satellite navigation applications, the current global satellite navigation system (GNSS) mainly includes GPS,GLONASS,Galileo and BDS.. Multi-mode navigation is the developing direction of satellite navigation in the future, and its superiority is more and more recognized. One of the focal problems of multimode navigation is the compatibility and interoperation of system time. In order to solve this problem, this paper studies the time difference monitoring method of GNSS system based on receiving space signal, and improves and evaluates the monitoring accuracy on the basis of studying the principle of time difference monitoring of the system and the distribution of various errors. The main research results of this paper are as follows: 1. In this paper, the principle of time difference monitoring is analyzed, the characteristics and distribution of errors affecting monitoring accuracy are studied, and the monitoring accuracy of general system time difference is quantitatively evaluated. 2. On the basis of the established GNSS system time difference monitoring platform, the measurement of GLONASS inter-frequency deviation and inter-system channel delay deviation of GPS/GLONASS receiver is studied and realized, and the measurement results are verified by experiments. The results show that the inter-frequency deviation of GLONASS is in the order of ns, and there is a linear trend with the increase of frequency number. For Septentrio PolaRx4 receiver, the internal channel delay deviation of 7.04ns exists between GPS and GLONASS system. Considering the GLONASS inter-frequency deviation and the inter-system channel delay deviation within the GPS/GLONASS receiver, the positioning results and the monitoring accuracy of the system time difference can be effectively improved. 3. The precision ephemeris of GPS,GLONASS provided by IGS is used to modify the time difference monitoring results of GNSS system and to improve the monitoring accuracy. The results of the modified UTC (NTSC)-GPST monitoring result showed that the RMS value was reduced by nearly 2 ns. The effects of two different processing methods of calculating ionospheric delay using IGS TEC MAP and measuring ionospheric delay with dual frequency on the time difference monitoring results of GNSS system are studied in this paper. The results show that the accuracy of the measured ionospheric delay using dual-frequency is about 30% higher than that calculated by IGS TEC MAP, UTC (NTSC)-GPST. 4. The accuracy of the system time difference monitoring results was tested and evaluated. Three evaluation methods are designed, which are compared with the monitoring results of different mechanisms, compared with the user-level processing results and multi-system navigation applications. The accuracy of the time difference monitoring results of the GNSS system is verified by practical experiments. 5. The method of using the time difference of the system is studied. According to the characteristics of multi-system navigation users, based on the construction of GNSS system time difference monitoring and prediction platform, the method of time difference-assisted multi-mode navigation in GNSS system is studied and verified by experiments. The results show that the system time difference-assisted multi-mode navigation can improve the availability of the system, improve the positioning accuracy, and improve the navigation performance.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1
[Abstract]:With the popularization and development of satellite navigation applications, the current global satellite navigation system (GNSS) mainly includes GPS,GLONASS,Galileo and BDS.. Multi-mode navigation is the developing direction of satellite navigation in the future, and its superiority is more and more recognized. One of the focal problems of multimode navigation is the compatibility and interoperation of system time. In order to solve this problem, this paper studies the time difference monitoring method of GNSS system based on receiving space signal, and improves and evaluates the monitoring accuracy on the basis of studying the principle of time difference monitoring of the system and the distribution of various errors. The main research results of this paper are as follows: 1. In this paper, the principle of time difference monitoring is analyzed, the characteristics and distribution of errors affecting monitoring accuracy are studied, and the monitoring accuracy of general system time difference is quantitatively evaluated. 2. On the basis of the established GNSS system time difference monitoring platform, the measurement of GLONASS inter-frequency deviation and inter-system channel delay deviation of GPS/GLONASS receiver is studied and realized, and the measurement results are verified by experiments. The results show that the inter-frequency deviation of GLONASS is in the order of ns, and there is a linear trend with the increase of frequency number. For Septentrio PolaRx4 receiver, the internal channel delay deviation of 7.04ns exists between GPS and GLONASS system. Considering the GLONASS inter-frequency deviation and the inter-system channel delay deviation within the GPS/GLONASS receiver, the positioning results and the monitoring accuracy of the system time difference can be effectively improved. 3. The precision ephemeris of GPS,GLONASS provided by IGS is used to modify the time difference monitoring results of GNSS system and to improve the monitoring accuracy. The results of the modified UTC (NTSC)-GPST monitoring result showed that the RMS value was reduced by nearly 2 ns. The effects of two different processing methods of calculating ionospheric delay using IGS TEC MAP and measuring ionospheric delay with dual frequency on the time difference monitoring results of GNSS system are studied in this paper. The results show that the accuracy of the measured ionospheric delay using dual-frequency is about 30% higher than that calculated by IGS TEC MAP, UTC (NTSC)-GPST. 4. The accuracy of the system time difference monitoring results was tested and evaluated. Three evaluation methods are designed, which are compared with the monitoring results of different mechanisms, compared with the user-level processing results and multi-system navigation applications. The accuracy of the time difference monitoring results of the GNSS system is verified by practical experiments. 5. The method of using the time difference of the system is studied. According to the characteristics of multi-system navigation users, based on the construction of GNSS system time difference monitoring and prediction platform, the method of time difference-assisted multi-mode navigation in GNSS system is studied and verified by experiments. The results show that the system time difference-assisted multi-mode navigation can improve the availability of the system, improve the positioning accuracy, and improve the navigation performance.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1
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