基于FFT的GPS信号快速捕获算法研究

Study on GPS signal fast acquisition algorithm based on FFT

GPS信号捕获是GPS接收机信号处理的关键技术之一,选择合适的捕获方法对接收机的工作性能有很大改善.传统的串行捕获算法计算量大,捕获时间长,无法满足GPS接收机实时处理的要求,而基于FFT的GPS信号快速捕获算法弥补了串行捕获算法的不足.通过MATLAB仿真对基于FFT的GPS信号快速捕获算法进行了仿真实验,并采用Monte Carlo方法对算法的频偏及码偏估计性能进行验证.仿真结果验证了FFT捕获算法的有效性和可靠性.

GPS signal acquisition is one of the key techniques of GPS receiver signal process-ing, selecting the appropriate method can improve the performance of the receiver .The tra-ditional serial acquisition algorithm has a large amount of calculation and the capture time is long , unable to meet the requirement of real -time processing of GPS receiver , but rapid ac-quisition algorithm for GPS signal based on FFT can make up for the lack of serial acquisition algorithm .This paper simulated the GPS signal fast acquisition algorithm based on FFT through the MATLAB simulation experiments .The simulation results further verified the reli-ability of this algorithm , and used the Monte Carlo method to verify the estimation perform-ance of the frequency offset and partial code .The simulation results verified the validity and reliability of the FFT acquisition algorithm .