北斗系统多频载波相位整周模糊度解算方法研究

Research on the Method of Calculating the Ambiguity of Multi-frequency Carrier Phase in Beidou System

研究利用LAMBDA方法来解算三频载波相位BDS系统和GPS系统整周模糊度并分析其固定精度情况。通过采用2 km、5 km、8 km、10 km和12 km五条基线进行单系统解算对比,实验结果表明,无论是BDS还是GPS,在进行单系统RTK解算中,N方向坐标偏差变化幅度较其他两个方向变化都是最大的;在进行5 km的基线解算中,BDS三个坐标方向偏差基本保持在-0.2~0.4 m之间,相对于GPS系统较好;5 km的基线解算中,GPS系统三个方向坐标偏差值基本在-0.1~0.1 m之间,较BDS系统稳定且精度高。2 km基线的时候在200历元左右GPS固定精度明显优于BDS,5 km的时候GPS在1 000历元左右模糊度固定精度明显要比BDS高,但是随着基线长度的增加,GPS系统模糊度固定精度逐渐趋近,直至小于BDS系统。

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 calculation 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.