Burst spread spectrum demodulation method for low-orbit anti-interference communication

The invention discloses a burst spread spectrum demodulation method for low-orbit anti-interference communication, and relates to the field of low-orbit and anti-interference satellite communication systems. Differential acquisition is adopted to ensure that an acquisition position is at a frame synchronization head position, parallel frequency sweeping is adopted to lock frequency offset in a certain range, frame header frequency estimation and phase estimation facilitate rapid locking of a carrier estimation loop, and secondary continuous frequency estimation tracks carrier frequency offset change caused by Doppler frequency shift, so that the carrier frequency offset change is more accurate. Therefore, a high-dynamic carrier synchronization function is realized. According to the method, self-adaptive rate matching, frame-by-frame spread spectrum ratio and variable information rate can be realized, low-signal-to-noise-ratio large-dynamic demodulation is facilitated, anti-interference and covert communicatio