Satellite search and rescue signal frequency estimation method

Provided is a satellite search and rescue signal frequency estimation method. By the adoption of a loop iteration processing structure, a narrow-band filter is used for meeting the requirement of a Kay fast frequency estimator for simple-frequency signals. The satellite search and rescue signal frequency estimation method comprises the following implementation steps that satellite search and rescue signals are received through a medium earth orbit local user terminal, coarse frequency estimation is conducted on the satellite search and rescue signals, and the band width of a BPF1 is designed; the signals pass through the BPF1, and signals s1 are obtained and divided into two channels; down-conversion is conducted on one channel of the s1, the sampling frequency is reduced further through an extractor, and output signals s2 of the extractor are used for iterative estimation; the s2 pass through a BPF2, medium frequency estimation is conducted so as to obtain omega2, the omega2 is used as the center frequency o