Signal searching method and signal searching device

The invention discloses a signal searching method and a signal searching device. The signal searching method provided by the embodiment of the invention comprises steps: at least two times of differential multiplication are carried out on input signals, and first differential signals are acquired; code phase searching is carried out according to the first differential signals and second differential signals to acquire a code phase of the input signals, wherein the second differential signals are obtained through carrying out multiple times of differential multiplication on pseudo codes corresponding to the input signals, and the times for differential multiplication on the pseudo codes corresponding to the input signals and the times for differential multiplication on the input signals are the same; and according to the input signals, the pseudo codes and the code phase, Doppler frequency shift searching is carried out, and a Doppler frequency shift value and the code phase are outputted. The problems that du