Method and device for realizing code phase searching

The invention discloses a method and a device for realizing code phase searching. The method comprises the steps of: combining in-phase and quadrature mixing results to generate a complex signal; downsampling the complex signal to obtain a first downsampled signal; generating first and second local conjugate results by means of a full coarse acquisition (C/A) code and a partial C/A code; subjecting the first downsampled signal to Fourier transform to obtain a first transform result, multiplying the first transform result by the first local conjugate result by means of a multiplier, and performing Fourier inverse transform, modulus operation and phase judgment to obtain a first judgment result; and acquiring a sample point of Fourier transform by means of the first judgment result, and performing Fourier transform on the complex signal to obtain a second transform result, and multiplying the second transform result by the second local conjugate result by means of a multiplier, and performing Fourier inverse tr