多卫星导航系统组合伪距差分定位可有效提升低成本车载单频设备精度。首先对伪距差分定位原理和数学模型进行阐述和推导，提出了一种适用于单频的窗口化相位平滑伪距定位技术。针对单卫星导航系统在遮挡等环境下观测卫星少，卫星结构不稳定的情况，在统一多系统的时空基准基础上，选取一颗共同参考星，进行伪距差分定位。使用一组实测的多卫星导航系统单频卫星数据进行实验论证，结果表明：车载多卫星导航系统相位平滑伪距平面精度优于0.2 m，高程优于0.7 m，对亚米级北斗系统高精度应用具有实际工程应用意义。%The pseudo-range differential position of multi-system integration is able to improve the accuracy of low-cost sin-gle-frequency apparatus carried on car effectively.In this paper,the theory and mathematical model of BDS/GPS pseudo-range differential position are introduced at first,and carrier phase smoothed pseudo-orange of single frequency,which uses a win-dow mode,is proposed then.In case of less observable satellites or unstable satellite structure,this paper also discusses the conversion of time and coordinates between BDS and GPS,which use a common reference satellite to get a pseudo-range differ-ential position.Through a series of observed data from BDS/GPS single-frequency chip carried on car,the results shows the improvement of algorithm and positioning precision of single-frequency dual constellation RTD equipment,plane accuracy better than 2.0 m,elevation than 0.7 m,which has practical engineering significance to the application of sub-meter precision with BDS.
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