Research And Design Of Navigation Terminal Testing Technology Based On Real Scene Database

At present,with the rapid development of global satellite navigation and positioning technology,and the construction of China's Beidou satellite navigation system is increasingly perfect.Navigation terminal equipment is widely used in various fields of the national economy,such as transportation,vehicle and vessel supervision,wearable equipment,mobile health care,urban express delivery,and shared bicycles.It also promotes the research of navigation terminal testing technologies.Flourish.Satellite signal simulator test as the most commonly used navigation terminal performance and functional test method can construct excellent standard parameters for the navigation terminal test environment,but this test method is too ideal,ignoring the fact that the real signal itself has random characteristics.The real road running signal test is the most realistic real environment test,which can directly reflect the real-time performance of the navigation terminal and fully reflect the carrier motion state throughout.However,the test cost of this test method is too high,and it does not have repeatability.The existing two types of navigation terminal test methods have great limitations,and in the face of a variety of navigation terminal products and sharply expanding navigation terminal markets appearing in the current market,it is urgent to establish a set of fast,complete,and accurate navigation terminals.The test system meets the requirements of the terminal market for terminal testing technology that is authentic,low cost,and highly repeatable.The research of navigation terminal test technology based on real scene database is to meet the requirements of authenticity,low cost and high repeatability by constructing a high-accuracy high-precision navigation terminal test and verification platform,which not only satisfies the relevant terminal equipment for complex and diverse application scenarios,The diversified needs also satisfy the demand for multiplex fusion location and high-precision navigation customization test.This manuscript first introduced the working principle of the navigation terminal testing technology based on real scene data in detail,and introduced the related testing theory,innovatively discussed the working principle and advantages of the related testing technology,and then the key to the relevant testing technology.Sexual issues were analyzed and researched in depth.Finally,through a comprehensive test plan developed by a research institute for a navigation terminal produced by a company,a systematic verification of the functions and performance of the navigation terminal was completed.The main research work and innovations of the manuscript are as follows:(1)GNSS/INS integrated navigation system is used to obtain the carrier's high-precision position and attitude information to meet the reliability and sustainability requirements of the data.(2)In order to process the location data of the output of the data playback subsystem in the test system,and to evaluate the performance of the navigation terminal reasonably according to the positioning accuracy,this project adopts the location precision data processing method based on the statistical distribution hypothesis.A multi-path delay magnitude joint tracking algorithm based on the maximum likelihood principle is used to jointly estimate the delay,amplitude and Doppler of multipath signal.(3)In this project,the clustering and classification algorithms are analyzed and verified according to the actual scene signals by means of data mining.According to the comprehensive analysis of the factors that affect the positioning results such as DOP value,signal strength and multipath characteristics,the final result of GNSS signal scene classification.(4)In view of the fact that the signal characteristics of the real scene signal vary greatly in randomness and can not be precisely controlled,new test methods are proposed,such as the accuracy test method,the recapture time test method and so on.The test results show that the relevant test techniques effectively promote the development of high performance algorithms such as multipath suppression algorithms and high-precision navigation and positioning algorithms,and reduce the testing cycle and testing costs of the positioning terminal.The research and development of the thesis are strong engineering application value.