Signal Search and Acquisition Algorithms for Software GPS Receiver

Based on the software platform of MATLAB simulation, the paper collects the real GPS Intermediate Frequency (IF) signal by the IF signal sampler, and uses it to carry out the time-domain correlation acquisition and the Fast Fourier Transform (FFT) acquisition on the C/A code of GPS signal, and also carry out the decision of the single-binary search and the M/N search on the personal computer. The experimental results show that comparing to the algorithm of time-domain correlation acquisition, the algorithm of FFT acquisition can consumedly reduce the computing times, and accordingly reduce the acquisition time. In addition, comparing to the decision algorithm of single-binary search, the M/N search can consumedly reduce the false-alarm probability and improve the detection probability.