Method of fast pseudo-code capture based on partial correlation and all-phase pre-processing
基于部分相关和全相位预处理的伪码快速捕获方法*

For the problem of long PN code capture in high dynamic Doppler shift situation in DSSS communications, the method of using partial correlation and all-phase pre-processing is presented to solve the problem. After using all-phase pre-processing and FFT to the sinusoidal signal that with Doppler shift, we get the apFFT spectrum amplitude. By an average of the cumulative apFFT spectrum amplitude, we can get the more accurate Doppler shift. Theoretical analysis and computer simulation prove that the algorithm can capture the PN code in a low snr, meanwhile, the algorithm can get the accurate Doppler shift.