针对北斗卫星信号存在系统性伪距偏差的问题,从多路径角度评估北斗三频信号的质量,验证了该项偏差与卫星轨道类型、卫星仰角及信号频率有关.为消除这一系统性偏差的影响,采用连续分段线性函数建立北斗三频伪距偏差校正模型.与现有的改正模型所不同,所提模型不仅采用了更长时间范围内的北斗实测数据,更为重要的是它顾及了改正数的精度信息.基于动态精密单点定位的实验结果表明,采用所提方法修正后,接收机定位性能有明显提升.%Regarding the problem of systematic pseudorange bias in BeiDou navigation system application, the pseudorange observations quality of Beidou triple frequency was analyzed from the multipath angle.The analysis results verified that the bias was related to the type of satellite orbit, satellite elevation angle and the signal frequency.In order to eliminate the effects of this systematic bias, a correction model for triple-frequency pseudorange bias was established with the continuous piecewise linear function.Compared with the traditional correction model, the proposed model used the Beidou measured data from a longer range and considered the accuracy of information of corrections.The correctness and superiority of the proposed model were verified by the experimental results on the basis of the dynamic precise point positioning.
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