一种快速高精度GPS组合定位方法研究

摘要

为解决高速铁路采用GPS实现列车定位时因卫星信号中断而造成的定位差错问题,提出一种快速高精度GPS组合定位方法.在原有GPS卫星接收机的基础上结合里程计与三轴加速度陀螺仪传感器,一方面将列车高速行驶时卫星信号所产生的多普勒频移引入GPS卫星接收机,建立高速列车卫星信号捕获的数学模型,以提高信号捕获搜索效率;另一方面针对卫星定位数据中断时如何与捷联惯导/航位推算系统(SINS/DR)的数据相衔接的问题,提出基于LSKF算法的GPS/SINS/DR列车定位方法.仿真结果表明,该方法可实现卫星信号的快速捕获及高精度定位,对于提高采用GPS实现高速列车定位的质量有一定参考价值.%In order to solve the positioning errors caused by the interruption of satellite signal during the train positioning using high-speed railway GPS , a fast and high precision GPS combined positioning method was presented in this paper . On the one hand , based on the original GPS satellite receiver , and combined with ODO and three axis accelerometer gyroscope sensor , the Doppler shift of the satellite signal was introduced in-to the GPS satellite receiver w hen train operated at high speed . A mathematical model for the acquisition of the high speed train satellite signal was established to improve the efficiency of signal acquisition and search . On the other hand , to deal with the issue of data convergence with the SINS/DR system when satellite positioning data are interrupted , the GPS/SINS/DR train location method based on LSKF algorithm was proposed . The simulation results showed that the proposed method can achieve fast acquisition of the satellite signal and high precision positioning , which has a certain reference value for improving the quality of high-speed train positio-ning using GPS .