Pseudo code phase modulation-linear frequency modulation time division low orbit navigation signal synchronization method and device

The invention relates to a pseudo code phase modulation-linear frequency modulation time-division low-orbit navigation signal synchronization method and a pseudo code phase modulation-linear frequency modulation time-division low-orbit navigation signal synchronization device. The method comprises the following steps: acquiring a received signal synchronization waveform of low-orbit satellite navigation; performing down-conversion calculation according to a preset local linear frequency modulation reference waveform and a received signal synchronization waveform, and performing down-sampling to obtain a down-sampling signal; generating a local pseudo code signal, and performing short-time correlation according to the local pseudo code signal and the down-sampling signal to obtain a short-time correlation value; sorting and grouping the short-time correlation values according to parity to obtain an odd-number sequence group and an even-number sequence group; performing post-accumulation on the odd sequence gro