High Resolution Code Acquisition Method Using Parabolic Interpolation for DSSS System

摘要

A DSSS signal acquisition algorithm is proposed to improve the spectrum peak degradation and the Doppler frequency measurement precision. It first integrates the data weighted by hanning-window,and then does the FFT analysis. Finally,it uses data points around the spectrum peak to determine a parabolic interpolation function,and then gets the position of the maximum point of the function to compute the Doppler frequency. Both analysis and simulation demonstrate that compared with the existing FFT-based code acquisition scheme,the proposed algorithm can reduce the degradation of the spectrum peak and improve the precision of the Doppler frequency measurement.