Improved PMF-FFT method applicable to P-code acquisition

The invention belongs to the field of signal acquisition of satellite navigation systems, and relates to an improved PMF-FFT method for P-code acquisition of a satellite navigation system. The methodcomprises the following steps: step S1, setting a total coherent integration time T and a piecewise coherent integration time T, and calculating a quantity K of partial matched filters and a length 2Xof the partial matched filters; step S2, calculating an operation time required by the K partial matched filters to perform a single PMF-FFT algorithm, its own power loss and envelope detection loss;step S3, determining a minimum non-coherent accumulation number required to reach the equivalent decision signal-to-noise ratio; step S4, obtaining a total operation time under the premise of the combined parameter values by calculation; and step S5, changing the value of the combined parameter values, and repeatedly executing the steps S1-S4 until the set number of times, so that the parameter value with the shortest tota