A Joint Estimation Algorithm of Timing and Carrier under Large Frequency Offset Satellite Signal

For low-orbit satellite communication systems, it is necessary to synchronize the received signals and estimate the frequency offset. Using chirp and Unique Words, a joint timing and carrier estimation algorithm can be completed. This algorithm can accurately estimate the Doppler frequency shift of low-orbit satellites, and is an algorithm that can meet the requirements of positioning and estimating frequency offset under high-speed motion. Through the joint algorithm, the signals from low-orbit satellites are synchronized at high speed and the frequency offset is estimated, and pass into the negative feedback loop to eliminate the Doppler frequency offset in time.