High resolution code acquisition method using parabolic interpolation for DSSS system

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.