Aiming at the characteristics of long propagation distance and large Doppler frequency shift caused by thehigh-speed movement of low earth orbit (LEO) satellites around the earth, the impact of doppler frequency shift on satellite to groundsynchronization and communication quality is analyzed.doppler frequency shift calculation and pre compensation techniques areimplemented based on ephemeris information and network planning and other situation prediction methods to coarse compensate forsatellite to ground doppler frequency shift, and the characteristics of direct spread spectrum sequences used in physical layerwaveforms are combined, complete frequency shift tracking and correction through delay locking, ensuring high-quality and reliableconnection of satellite links, and ensuring efficient, reliable, and safe operation of the satellite internet of things.