卫星导航信号质量监测评估算法研究与系统实现

发布时间：2019-01-09 17:09

【摘要】：卫星导航信号的设计及性能直接影响到卫星导航系统的定位、导航、授时等服务性能和用户的使用效能。导航信号质量监测评估的目的正是在于完成对在轨导航卫星导航信号的性能监测,验证导航信号的设计体制,评定导航信号的空间传输及服务性能。同时,能够为系统故障诊断、卫星信号完好性监测等提供重要支撑,是保证系统安全性、完备性、稳定性的必要手段。因此,导航信号质量监测评估是卫星导航系统(GNSS)设计和运行过程中的重要环节,美国与欧盟都非常重视导航信号质量的监测评估工作,GPS和Galileo都分别拥有各自的信号监测评估系统。本文的研究重点包括GNSS导航信号调制方式的研究与分析、GNSS导航信号质量评估对象、评估体系以及评估方法的研究与确立和基于GPU平台的导航信号质量评估系统的设计实现及算法验证三个方面。首先,GNSS导航信号体制研究,该部分详细介绍了目前国际上不同GNSS系统所播发导航信号的调制方式的基本原理和理论实现,并对各类调制方式进行了仿真分析,通过对它们的时域波形、频谱和相关函数的对比,总结了各类调制方式的特性,为提炼信号质量评估的对象和内容奠定基础。其次,在分析导航信号调制方式的基础上,指出了本文导航信号质量评估的对象,结合空间接口控制文件所规定的性能规范,研究并建立了导航信号质量评估的评估体系和具体指标,包括信号的时域分析、频域分析、调制域分析、相关域分析和测量域分析,并针对每项评估指标深入研究了多种评估手段和评估算法。最后,搭建了一套基于GPU平台的实时导航信号质量评估系统,对该系统的组成、工作原理、各功能单元设计、硬件设计、软件设计和接口设计进行了详细的论述,对本文研究的信号质量评估算法进行编程实现,开发了导航信号质量评估软件,通过分析和处理实测数据,对评估方法的有效性和正确性进行了验证。本文开展的导航信号质量监测评估研究既是对导航系统导航信号本身性能及各项指标的综合测量,也是从用户实际应用的角度对系统本身性能的评估,具有极其重要的意义。
[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.
【学位授予单位】：华中师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN967.1

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