Single Base Station CORS System Upgrade Design And Analysis Based On Beidou Galaxy Station

Differential GPS has been widely used all over the world at present, and it hashigh positioning accuracy and has very high reliability at the same time. A lot of basestations have been set up in our country recently, and provide a lot of convenience inthe national daily life. But these stations are mostly based on GPS, with beidounavigation system that China researched and developed independently has been tookinto practical application. How to realize the differential positioning of beidou is aproblem that must be considered. There are two ideas to realize the beidou differentialpositioning: one is to set up new beidou base stations, the other is to improve thecurrent base station, and make it compatible with beidou system.This article uses the last method, tries to realize the broadcast of differentialcorrection number, and improves the base stations have been set up on the basis ofdefining the beidou’s difference correction cable, and program the beidou’s differencecorrection cable. There are three links need to be considered from generation tobroadcast for differential correction number, respectively is difference correctionnumber generation, difference correction coding, difference correction for broadcast.This paper introduces the current mainstream of three difference correction algorithmsystematically, and adopted in the practical application of phase smoothingpseudorange algorithm; This paper also Introduces the current mainstream of twodifference agreement-RTCM and CMR, compared the RTCM2.3version and theversion3.1, and the difference between the RTCM and CMR agreement, analyzes theimprovements of RTCM3.1version from the2.3version of and the advantages ofCMR from RTCM.This paper predefine beidou difference correction cable on the basis of existingdata, and achieve the beidou difference correct number coding combined with practice,after the correct number is generated combined with the existing data the positioningaccuracy is analyzed. It make it sure that the correct number is reliable and effective.