A Pilot-Aided Method of Doppler Offset Estimation and Compensation

Low earth orbit (LEO) satellite has attracted worldwide attention due to its wide coverage, low transmission delay, and low transmission loss. Therefore, it has been given many uses including military communication. Direct sequence spread spectrum (DSSS) is widely used in military communication for its good ability of anti-jamming and anti-eavesdropping. However, the high-speed movement of LEO satellite relative to the terminal will cause serious carrier offset and pseudo-noise (PN) code offset of DSSS receiver signal, which seriously increases the complexity of the algorithm. In this paper, a pilot-aided method of Doppler offset estimation and compensation is proposed. The real-time Doppler carrier offset and PN code offset between satellite and terminal are estimated by terminal processing of the pilot signal, and real-time precompensation is carried out when sending uplink service signal or receiving downlink service signal. Through hardware verification, this method can significantly reduce the resource consumption of terminal and satellite.