微弱GPS信号捕获算法研究

为了快速有效地检测到微弱的GPSC/A码信号,研究一种基于软件接收机的信号捕获算法,分析此算法的信号捕获性能。这种算法利用FFT和IFFT技术加快了捕获速度;针对预检测求和间隔里有可能包括数据位改变,讨论了交替的半个数据位选取方案和整个数据位选取方案两种解决方案。通过仿真分析证明,这种信号捕获算法具有更强的信号检测能力。

Study on Acquisition Algorithm of Weak GPS Signals

In order to detect weak GPS signals more rapidly and efficiently,a method of signal acquisition based on GPS software receiver is studied and the signal acquisition performance is analyzed.FFT and IFFT are used to speed up the signal acquisition. Since there are unknown data bit transitions during the pre-detection summation intervals,two solutions are discussed:alternated half-bit method and full-bit method.The simulation of signal acquisition analysis with MATLAB indicates the acquisition algorithm in this paper can achieve better detection capability.