Beidou Receiver Tracking Loop Design And Networking Applications Research

Beidou satellite navigation system is a global satellite navigation system developed by Chinese,which can be around the world all-weather,all day for large-scale users to provide high-precision,highly reliable positioning,navigation,timing and other services,and has the short message communication ability.According to the existing strategy deployment and planning,it is estimated that China will complete the whole constellation construction of the Beidou system taking the 35 "Beidou two generation" navigation satellites as the main body around 2020.In the process of positioning information demodulation,Beidou receiver,as carrier satellite signal processing,is indispensable and significant,which not only closely link to the user experience,to provide a lot of references of Beidou system function optimization.Based on the introduction of the Beidou satellite navigation system and the working principle of the Beidou receiver,this paper mainly includes two aspects.The first aspect is the improvement and design of the Beidou receiver tracking loop.The second aspect is the Beidou receiver network application study.In the Beidou receiver baseband digital processing module operation,satellite multipath signals distort the ranging code and navigation data that aremodulated to the navigation signal,causing the phase of the carrier to be distorted,resulting in reduced quality of the measured data and even lock-loss of the receiver loop.In order to solve the problem of satellite multipath interference in a specific environment,the design idea of the cyclic tracking loop is proposed.The satellite signal received by the receiver is subjected to RF front-end processing and digital down-conversion processing to obtain the satellite intermediate frequency signal.In the baseband signal processing module Secondary tracking mechanism to complete the satellite multipath signal suppression,thereby improving the positioning accuracy of the receiver.At the same time,integrated the advantage of the scalar tracking algorithm and the vector tracking algorithm,the Beidou receiver tracking loop design based on scalar and vector architecture is proposed.The output information of the vector tracking part is defined as the main information,and the scalar output is defined as auxiliary information.Then the main information and auxiliary information together input the discriminator,using extended Kalman filter algorithm to calculate the output information,effectively improve the performance of the loop.In the application research of receiver network,based on the principle of crowdsourcing,using the method of information sharing,the Beidou receiver simple networking method based on cloud data processing is proposed to improve the positioning accuracy of the positioning receiver while sharing information.