GNSS改进型平均相关捕获技术和Simulink仿真

为了缩短全球导航卫星系统(GNSS)接收机开机时间,减少运算量对计算机性能的要求,对传统并行码相位捕获方法进行了改进,提出了改进型平均相关捕获方法用于进行基带信号捕获。此方法是对中频信号进行二次平均分组采样以减少傅里叶变换点数,进而达到减少运算量的目的,并且改进了传统的并行码相位捕获方法框架,进行码相位和载波捕获。利用Matlab/Simulink作为仿真平台对实际GNSS采集信号进行捕获仿真,证明了改进型捕获算法可降低运算量,缩短42%的捕获时间,虽存在0.02%的码相位误差,但满足实时捕获C/A码相位和载波频率的要求。

Improved Average Correlation Acquisition Technique for GNSS Signal and Simulink Simulation

In order to shorten the GNSS(Global Navigation Satellite System)receiver boot time and reduce the computation requirements on the performance of the computer,the traditional parallel code phase acquisition method is improved.The improved average correlation acquisition method is proposed for base-band signal acquisition.The intermediate frequency signal is the average packet sampling in the method,in order to reduce the number of Fourier transform which can reduce the amount of computation.The traditional parallel code phase acquisition method framework is improved to perform code phase and carrier acquisition.Matlab/Simulink is used as the simulation platform to acquire the actual GNSS base-band signals.It is proven that the improved acquisition algorithm can reduce the computational complexity and shorten the acquisition time by 42%.Although there are 0.02%code phase errors,the improved acquisition algorithm can meet the requirements of real-time acquisition of C/A code phase and carrier frequency.