A Carrier Tracking Algorithm Based on Signal Dynamic Estimation

In the satellite communication system, the phase jitter caused by the dynamic stress error and thermal noise makes the demodulation loss obvious when the carrier tracking of the large dynamic signal is carried out at low SNR, to solve this problem, a carrier tracking algorithm based on dynamic signal estimation is proposed. At first, the signal is roughly estimated and compensated by using the FFT algorithm and FFT analysis of delay correlation, and then the signal is tracked by the third-order phase-locked loop (PLL), the algorithm is improved and simulated. The simulation results show that this method can achieve stable carrier tracking with a symbol rate of 1 Mbps and a tracking rate of 150 kHz/s at a carrier-to-noise ratio of 63 dBHz, and the demodulation loss is less than 0.3 dB. By using this algorithm, the carrier tracking complexity can be reduced and the tracking precision can be improved, which provides a basis for the improvement of the carrier tracking module of the receiver.