Research On Analysis Technology Of Navigation Signal Quality

Navigation signal quality analysis and evaluation to the second generation BDS of signal monitoring,fault diagnosis system is compatible with interoperability,and to provide important theoretical basis for signal integrity is an essential part of a satellite navigation system construction work.RF channel is one of the important parts in the navigation receiver,the amplitude-frequency characteristic and phase frequency characteristics has become a navigation signal quality analysis error is one of the major factors,so in non-ideal characteristics is of great significance to study the effect of the quality of the signal.Papers to applications for background on the construction of BDS in China,to carry out the research from the following several aspects:1 ? The traditional navigation signal quality assessment only focus on the characteristics of the signal itself,not for relevant range performance indicators,cannot be directly used for navigation users.This paper summarizes the general process navigation signal quality assessment,introduces the frequency domain,time domain and modulation domain,the related domain,and many other indicators of traditional signal quality assessment technology,analyzed of ranging performance is closely linked with the user code tracking deviation index T-offset and code tracking accuracy,for later for the analysis of the effect of channel distortion of the navigation signal quality laid a theoretical foundation.2?The existing channel non-ideal characteristics influence on navigation and positioning analysis is built on a particular receiver,and can not fully reflect the positioning range performance.In this paper,by means of the RF channel low-pass equivalent analysis model,study the influence of the general channel of the navigation signal quality,and analyze the filter with limit,channel amplitude distortion,phase distortion,etc on the quality of the signal,especially for code phase tracking error Toffset curves.Using this evaluation method can get a conclusion that the main factor causing navigation signals ranging error is nonlinear phase distortion.3?The unit of BD navigation signal quality evaluation system software and hardware platform,can real-time monitoring and evaluation of BD in-orbit signals and abnormal signal analysis,security BD navigation service performance.This paper,by using system multi-modulation signal source for tests carried out to verify the system function performance,and the measured assessment BD satellite on-orbit test signal.The results show that the navigation signal quality evaluation system can be used for beidou satellite on-orbit signal monitoring.Finally,summarizes the thesis research results and its engineering significance,and predicts the next step will be to carry out the work.