一种惯性信息辅助下的GPS快捕方法

全球定位系统(GPS,Global Positioning System)信号的捕获时间直接影响高动态环境下GPS接收机的使用性能.在分析传统的外部信息辅助GPS捕获方法的基础上,提出了一种在惯性信息辅助下进行快速捕获的方法,该方法由粗捕获和精捕获构成.详细分析了该方法的实现方法和性能,进行了MATLAB/Simulink系统级仿真及蒙特卡罗仿真试验.仿真结果表明:在保证码相位捕获精度和提高频率分辨率的前提下,运用该方法可以显著缩短GPS接收机搜索捕获的时间,提高接收机的动态性能,相对无外部信息辅助的情况总捕获时间缩短至2%~3%.

GPS signal fast acquisition method aided by inertial information

The signal acquisition time affects the performance of global positioning system (GPS) receiver directly under high dynamic conditions. Based on the analysis of traditional acquisition method aided by external information, an improved fast acquisition method was proposed which was aided by inertial information and ephemeris supplied by GPS/inertial navigation system (INS) integrated navigation system. This new method was composed of coarse acquisition and fine acquisition,of which the implementation method and acquisition performance were analyzed. The acquisition algorithm was validated in efficiency by MATLAB/Simulink system-level simulation and Monte Carlo test. The simulation results show that when C/A code resolution is ensured and high carrier frequency resolution is obtained using this new method, the acquisition time can be reduced obviously so that the acquisition performance of high dynamic GPS receiver can be improved. Compared with the conventional GPS signal acquisition method, the total acquisition time can be reduced to 2%~3%.