GNSS系統(tǒng)時間偏差監(jiān)測精度改善及評估
發(fā)布時間：2019-03-29 14:24
【摘要】：隨著衛(wèi)星導航應用的普及與發(fā)展，當前全球衛(wèi)星導航系統(tǒng)GNSS主要包括GPS、GLONASS、Galileo以及BDS。多模導航是未來衛(wèi)星導航領域的發(fā)展方向，其優(yōu)越性越來越被人們所認識到。多模導航需要解決的焦點問題之一就是系統(tǒng)時間的兼容與互操作。 針對此問題，本文開展了基于接收空間信號實現(xiàn)GNSS系統(tǒng)時差監(jiān)測方法的研究，并在研究系統(tǒng)時差監(jiān)測原理及各項誤差分布的基礎上進行監(jiān)測精度改善與評估。論文的主要研究成果如下： 1.分析了系統(tǒng)時差監(jiān)測原理，研究了影響監(jiān)測精度的各項誤差特點及其分布規(guī)律，對一般系統(tǒng)時差監(jiān)測精度進行了定量評估。 2.在已建成的GNSS系統(tǒng)時差監(jiān)測平臺的基礎上，研究并實現(xiàn)了接收機端GLONASS頻間偏差以及GPS/GLONASS接收機內部系統(tǒng)間通道延遲偏差的測量，并設計實驗對測量結果進行了驗證。結果表明：GLONASS頻間偏差在ns量級，并跟隨頻率號的增加呈線性趨勢。對于Septentrio PolaRx4接收機而言，GPS與GLONASS系統(tǒng)之間存在7.04ns的內部通道延遲偏差�？紤]GLONASS頻間偏差和GPS/GLONASS接收機內部系統(tǒng)間通道延遲偏差可以有效改善定位結果與系統(tǒng)時差監(jiān)測精度。 3.利用IGS提供的GPS、GLONASS精密星歷對GNSS系統(tǒng)時差監(jiān)測結果進行事后修正，改善監(jiān)測精度。修正后UTC(NTSC)-GPST的監(jiān)測結果RMS值降低了將近2ns。研究了利用IGS TEC MAP計算電離層時延以及雙頻實測電離層時延兩種不同處理方法對GNSS系統(tǒng)時差監(jiān)測結果的影響。結果表明：利用雙頻實測電離層時延相對于利用IGS TEC MAP計算電離層時延，，UTC(NTSC)-GPST監(jiān)測結果準確性提高了30%左右。 4.對系統(tǒng)時差監(jiān)測結果的準確性進行了測試評估。設計了與不同機構監(jiān)測結果互比、與用戶級處理結果比對以及多系統(tǒng)導航應用三種評估方法，通過實際實驗驗證了GNSS系統(tǒng)時差監(jiān)測結果的準確性。 5.研究了系統(tǒng)時差的使用方法。針對多系統(tǒng)導航用戶的使用特點，基于GNSS系統(tǒng)時差監(jiān)測與預報平臺的搭建，研究了GNSS系統(tǒng)時差輔助多模導航的方法并對其做了實驗驗證。結果表明：系統(tǒng)時差輔助多模導航可以提高系統(tǒng)的可用性、改善定位精度、提高導航性能。
[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.
【學位授予單位】：中國科學院研究生院（國家授時中心）
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：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.
【學位授予單位】：中國科學院研究生院（國家授時中心）
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN96.1
【參考文獻】
相關期刊論文 前10條
1 何玉晶;楊力;;基于拉格朗日插值方法的GPS IGS精密星歷插值分析[J];測繪工程;2011年05期
2 翟清斌,齊維君;GPS天線相位中心變化及測試[J];測繪科學;2004年02期
3 余明,郭際明,過靜s
本文編號：2449628
本文鏈接：http://www.sikaile.net/kejilunwen/wltx/2449628.html
最近更新
教材專著
