Efficient large signal-to-noise ratio direct spread spectrum signal capturing method and system

The invention relates to an efficient large-signal-to-noise-ratio direct spread spectrum signal capturing method and system, and the method comprises the steps: firstly obtaining a sparse pseudo code and a current iteration local carrier signal sequence, and enabling the sparse pseudo code to be obtained through the processing of a local pseudo code and a preset sparse factor; stripping a carrier in the received direct spread spectrum signal through a current iteration local carrier signal sequence to obtain a corresponding low-frequency signal; performing sparse processing on the low-frequency signal according to the sparse factor to obtain a sparse signal, performing calculation according to the frequency domain form of the sparse pseudo code and the sparse signal to obtain a correlation sequence, performing time domain rearrangement on the correlation sequence to separate a time domain peak value in the correlation sequence to obtain a rearranged signal, and performing time domain rearrangement on the rear