RESEARCH ON DYNAMIC RELATIVE POSITIONING ALGORITHM OF COMBINED GPS/BDS/GLONASS

摘要

In order to improve the ambiguity fixation success and reliability based on unifying space-time datum of GPS/BDS (BeiDou Navigation Satellite System)/GLONASS,the unified combinedobservation models will be established.The ambiguity will be resolved by using the combination of single-difference ambiguity estimation and double-difference ambiguity fixation.The analysis results of the real positioning data indicate the accuracy of combined GPS/BDS/GLONASS is better than that of a single system positioning,which effectively enhance the intensity of GNSS constellation geometry.Especially,compared with the double system positioning,the improvement is about 27.3％～ 42.7％ in the single epoch solution.