| The global satellite navigation system has the advantages of all-weather,all-weather and high-precision.However,in restricted areas such as indoors,buildings,and underground facilities with high shielding and multi-blocking,there are situations where the GNSS signal is seriously attenuated and the visibility of the satellite is reduced.Provide reliable location services.The application of pseuolite technology in such an environment improves the continuity and reliability of positioning services,and achieves seamless positioning connection between indoor and outdoor.This article mainly designs and implements an indoor pseuolite transceiver system,including a pseuolite signal transmitter with adjustable power and bandwidth in real time,and a software receiver that can receive and process pseuolite signals.The main research contents are as follows:(1)By analyzing the mathematical model of pseudolite signals,the overall design ideas of pseudolite transmitters are given;the overall design scheme of pseudosatellite transmitters based on software radio technology is improved,and the detailed design of each functional module of the transmitter is completed;test results It shows that all performance indexes of pseudolite transmitters have reached the design requirements.(2)The overall design framework of pseuolite software receiver based on software radio technology is proposed,and the components of the software receiver are analyzed;the internal operation process of the multi-threaded software receiver is studied in detail,especially signal acquisition and signal tracking Partial design of principle;targeted modification of pseuolite pseudo-range,carrier,Doppler frequency shift and carrier-to-noise ratio of four observations;the test results show that the pseuolite software receiver has good acquisition and tracking performance and observation The quantity output is stable and can be used for pseuolite position calculation in indoor environment.(3)Build an indoor pseuolite positioning experiment environment,test and analyze the positioning effect of the entire indoor pseuolite transceiver system;the experimental results show that the positioning accuracy of the indoor pseuolite transceiver system used can reach the decimeter level and have certain anti-interference performance.In this paper,through the combination of software and hardware design and experiment,the design scheme and software and hardware debugging of the indoor pseuolite transceiver system are completed.Combining the functional test results of each module of the system and the indoor positioning experiment verifies the feasibility of the entire system. |
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