Rapid GPS bit synchronization method

The invention provides a rapid GPS bit synchronization method. According to the method, frequency mixing is performed on an input signal and a local same-frequency carrier signal, then coherent integration is performed on a signal obtained after carrier waves are removed and a local pseudo-random code, the dot product difference between a k-1 integral value and a kth integral value is calculated, and the specific nature of the dot product difference output result is used for judging the turning point of a data bit, bit synchronization is achieved, and finally, according to a histogram statistic result of data jump points within statistic time, a bit synchronization point is determined. The positioning waiting time can be shortened, the judgment probability of the bit synchronization point can be increased, and the algorithm is mature, stable and easy to implement.