Research on BDS/GPS/GLONASS Medium-range RTK Algorithm
In response to the rapidly decreasing correlation of atmospheric delay error between medium-range RTK reference station and rover station,which leads to the problem of limited success rate of multi-system multi-frequency full ambiguity solving and low Ratio value,this paper proposes a multi-frequency real-time kinematic positioning algorithm for estimating the atmospheric delay with BDS/GPS/GLONASS Kalman filtering method,which combines the ionospheric delay,relative tropospheric delay error and inter-fre-quency bias of GLONASS system as parameter estimation,adopting a partial ambiguity fixed strategy,setting the threshold of the num-ber of successive fixed epoch related to the observation period and the ambiguity cutoff angle resolution of a section of 22.4 km base-line,the experimental results show that the accuracy of the GLONASS single-system RTK results is ensured by the estimation of the inter-frequency bias of the GLONASS phase observation. The combined positioning of three systems increases the number of filter esti-mation parameters but ensures the satellite geometric configuration and improves the positioning accuracy.
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