Research And Implementation Of Anti-interference And Comprehensive Performance Evaluation Of GNSS Receiver

With the increasingly widespread application of global navigation satellite systems,the development of GNSS receiver technology is also changing with each passing day,and users are increasingly demanding the reliability of receivers.Therefore,the method of evaluating the performance of GNSS receivers has become a key research for practitioners in the field of satellite navigation the problem.The objective comprehensive performance evaluation of the receiver is very important,and the test of anti-interference performance is also an indispensable part of it,and has not been fully studied so far.Therefore,this paper perfects the receiver anti-interference performance test index system,establishes the receiver comprehensive performance evaluation algorithm based on AHP and FCE,and develops the receiver anti-interference performance key index automatic test system and receiver data analysis system.The main content of the paper is as follows:First,the definition and test methods of key indicators of GNSS receiver antijamming performance are studied.Firstly,a receiver anti-interference performance test system based on the GNSS signal simulator is constructed,the definitions of interference suppression and anti-interference sensitivity are improved,and the test methods are studied in detail.In the domestic literature that we have seen so far,there is very little research on the interference recovery time of GNSS receivers.In this paper,the test method of the receiver’s interference recovery time index is studied in detail.Finally,two different types of receivers were tested,and the results show that the receiver interference suppression degree and interference recovery time test methods studied in this paper are correct and feasible.Second,the comprehensive performance evaluation method of GNSS receiver is studied.First select the test indexes corresponding to the three types of receivers and establish a hierarchical test index system.Then research the two comprehensive evaluation methods of analytic hierarchy process(AHP)and fuzzy synthesis method(FCE),integrate them into an algorithm and apply to the comprehensive performance evaluation of GNSS receiver.Finally,a comprehensive performance evaluation is carried out on three receivers of different models,and the evaluation result is in line with expert evaluation,which proves that the algorithm is effective.Third,design and implement an automatic test system for key indicators of GNSS receiver anti-jamming performance.The system includes five modules,namely: PC and instrument communication module,test system main page,interference suppression test module,anti-interference sensitivity test module and interference recovery time test module.The system can automatically control the signal generator to generate interference signals to complete the receiver’s anti-interference performance index test.Fourth,the design and implementation of a GNSS receiver data analysis system.The system is divided into four major modules,namely database management module,test data import module,receiver test data query and comprehensive evaluation algorithm implementation module,and receiver data analysis and statistics module.Through this system,storage,management and query of GNSS receiver test data can be completed,comprehensive performance evaluation of the receiver can be performed,and statistics and analysis of the receiver test data can also be performed.Finally,a large amount of data was simulated to test the system.The system passed the test and all functions were operating normally.The research results of this article can provide important technical support for professional organizations to formulate anti-jamming performance test standards for GNSS receivers,and also provide scientific numerical basis for the overall performance comparison of receivers.The establishment of the two systems can easily test the antiinterference performance of the receiver,and can completely save the receiver test data to facilitate the statistics and analysis of the receiver.