【摘要】：衛(wèi)星導航信號的設計及性能直接影響到衛(wèi)星導航系統(tǒng)的定位、導航、授時等服務性能和用戶的使用效能。導航信號質量監(jiān)測評估的目的正是在于完成對在軌導航衛(wèi)星導航信號的性能監(jiān)測,驗證導航信號的設計體制,評定導航信號的空間傳輸及服務性能。同時,能夠為系統(tǒng)故障診斷、衛(wèi)星信號完好性監(jiān)測等提供重要支撐,是保證系統(tǒng)安全性、完備性、穩(wěn)定性的必要手段。因此,導航信號質量監(jiān)測評估是衛(wèi)星導航系統(tǒng)(GNSS)設計和運行過程中的重要環(huán)節(jié),美國與歐盟都非常重視導航信號質量的監(jiān)測評估工作,GPS和Galileo都分別擁有各自的信號監(jiān)測評估系統(tǒng)。本文的研究重點包括GNSS導航信號調制方式的研究與分析、GNSS導航信號質量評估對象、評估體系以及評估方法的研究與確立和基于GPU平臺的導航信號質量評估系統(tǒng)的設計實現及算法驗證三個方面。首先,GNSS導航信號體制研究,該部分詳細介紹了目前國際上不同GNSS系統(tǒng)所播發(fā)導航信號的調制方式的基本原理和理論實現,并對各類調制方式進行了仿真分析,通過對它們的時域波形、頻譜和相關函數的對比,總結了各類調制方式的特性,為提煉信號質量評估的對象和內容奠定基礎。其次,在分析導航信號調制方式的基礎上,指出了本文導航信號質量評估的對象,結合空間接口控制文件所規(guī)定的性能規(guī)范,研究并建立了導航信號質量評估的評估體系和具體指標,包括信號的時域分析、頻域分析、調制域分析、相關域分析和測量域分析,并針對每項評估指標深入研究了多種評估手段和評估算法。最后,搭建了一套基于GPU平臺的實時導航信號質量評估系統(tǒng),對該系統(tǒng)的組成、工作原理、各功能單元設計、硬件設計、軟件設計和接口設計進行了詳細的論述,對本文研究的信號質量評估算法進行編程實現,開發(fā)了導航信號質量評估軟件,通過分析和處理實測數據,對評估方法的有效性和正確性進行了驗證。本文開展的導航信號質量監(jiān)測評估研究既是對導航系統(tǒng)導航信號本身性能及各項指標的綜合測量,也是從用戶實際應用的角度對系統(tǒng)本身性能的評估,具有極其重要的意義。
[Abstract]:The design and performance of satellite navigation signal have a direct impact on the positioning, navigation, timing and other service performance of satellite navigation system, as well as the performance of users. The purpose of monitoring and evaluating navigation signal quality is to monitor the performance of navigation signal in orbit verify the design system of navigation signal and evaluate the spatial transmission and service performance of navigation signal. At the same time, it can provide important support for system fault diagnosis and satellite signal integrity monitoring, which is a necessary means to ensure system security, completeness and stability. Therefore, the monitoring and evaluation of navigation signal quality is an important link in the design and operation of satellite navigation system (GNSS). Both the United States and the European Union attach great importance to the monitoring and evaluation of navigation signal quality. Both GPS and Galileo have their own signal monitoring and evaluation systems. This paper focuses on the research and analysis of GNSS navigation signal modulation mode, GNSS navigation signal quality evaluation object, Research and establishment of evaluation system and evaluation method, design and implementation of navigation signal quality assessment system based on GPU platform and algorithm verification. First of all, the research of GNSS navigation signal system, this part introduces in detail the basic principle and theory realization of the modulation mode of the navigation signal broadcast by different international GNSS systems, and carries on the simulation analysis to each kind of modulation mode. By comparing their time-domain waveforms, spectrum and correlation functions, the characteristics of various modulation modes are summarized, which lays a foundation for refining the object and content of signal quality evaluation. Secondly, on the basis of analyzing the modulation mode of navigation signal, the paper points out the evaluation object of navigation signal quality, combined with the performance specification stipulated in the space interface control file. The evaluation system of navigation signal quality evaluation is studied and established, including signal analysis in time domain, frequency domain analysis, modulation domain analysis, correlation domain analysis and measurement domain analysis. Various evaluation methods and algorithms are studied for each evaluation index. Finally, a real-time navigation signal quality evaluation system based on GPU platform is built. The composition, working principle, function unit design, hardware design, software design and interface design of the system are discussed in detail. In this paper, the algorithm of signal quality evaluation is programmed, and the software of navigation signal quality evaluation is developed. The validity and correctness of the evaluation method are verified by analyzing and processing the measured data. The research of navigation signal quality monitoring and evaluation carried out in this paper is not only the comprehensive measurement of the navigation signal itself and its various indexes, but also the evaluation of the system performance from the point of view of the actual application of the user, which is of great significance.
【學位授予單位】：華中師范大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN967.1

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