Research on the Method of Calculating the Ambiguity of Multi-frequency Carrier Phase in Beidou System
This article studies the use of LAMBDA method to calculate the integer ambiguity of the three frequency carrier phase BDS system and GPS system,and analyzes their fixed accuracy. Five baselines,2km,5km,8km,10km,and 12km,were used for single system cal-culation and comparison. The experimental results show that in the single system RTK calculation,whether using BDS or GPS,the variation amplitude of coordinate deviation in the N direction is the largest compared to the other two directions;In the baseline calculation of 5km,the deviation of the three coordinate directions of BDS is basically maintained between-0. 2～0. 4m,which is better compared to the GPS system;In the baseline calculation of 5km,the deviation values of the GPS system' s coordinates in the three directions are basically between-0. 1 and 0. 1m,which is more stable and accurate than the BDS system. At a baseline of 2km,the fixed accuracy of GPS at around 200 epochs is significantly better than that of BDS,while at 5km,the fixed accuracy of GPS at around 1000 epochs is significantly higher than that of BDS. However,as the baseline length increases,the fixed accuracy of GPS system ambiguity gradually approaches,until it is smaller than that of BDS system.
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