Design of Peak-finding Algorithm on Acquisition of Weak GPS Signals

GPS is the system combined CDMA technique and trilateration to obtain precision position information. The main goal of this paper is design of high-sensitivity receiver on acquisition of weak GPS signals. A new peak-finding algorithm is developed to search the C/A code phase in the FFT-based correlation domain. This method can estimate the peak location accurately and provides a faster performance in the software-based signal acquisition. The integration time deciding algorithm is also utilized to enhance the capability of waveform search under indoor environments. Simulation results demonstrate that our proposed scheme can acquire the GPS signal efficiently under the power level of-155 dBm in frequency domain processing.