Two-stage fast signal capturing method for time division navigation signals under large Doppler

The invention relates to a two-stage fast signal capturing method for time division navigation signals under large Doppler. The method comprises the following steps: acquiring a digital baseband signal received by a navigation receiver, and sampling the digital baseband signal to obtain a first sampling signal; traversing the first code phase search range, and performing code phase capture on the time division pulse sequence corresponding to the first sampling signal to obtain a first pseudo code phase capture result; after waiting for a preset time interval, sampling the digital baseband signal to obtain a second sampling signal, and obtaining a second code phase search range according to the pre-estimated maximum Doppler of the digital baseband signal; traversing the second code phase search range, and performing code phase capture on the time division pulse sequence corresponding to the second sampling signal to obtain a second pseudo code phase capture result; and obtaining carrier Doppler according to th