Missile-borne high-dynamic Beidou B3I signal capturing method and device based on bit traversal

The invention relates to a missile-borne high-dynamic Beidou B3I signal capturing method and device based on bit traversal, and the method comprises the steps: firstly, reading down-sampled zero intermediate frequency data and a pseudo-random code sequence cached by a receiver at the same time, and carrying out the segmentation correlation integral operation; equally dividing the segmented correlation integration result into a front group and a rear group, and respectively multiplying the front group and the rear group by (-1, + 1) and (+ 1, + 1) so as to carry out bit traversal processing; performing zero padding on two groups of correlation integral results after bit traversal, performing FFT (Fast Fourier Transform) operation, and performing modulo operation on the FFT results to obtain a peak value; and the maximum peak value is selected through comparison, and threshold judgment is carried out. According to the method, the bad influence of frequent bit hopping on the coherent integral detection peak valu