关键词: 锁频环, 锁相环, 高动态同步, NiosII软核处理器

Abstract: Aiming at the characteristics of navigation satellite system，theoretical expressions of frequency-locked and phase-locked algorithm are gained according to practical system.The results of AFC algorithm are processed using modified smoothed algorithm，and its covariance is decreased.Simultaneously，Frequency-locked loop and costas loop work synchronously，which shorten the update time of them.Above algorithm is realized using single FPGA，frequency-locked loop and phase-locked loop are implemented by NiosII replacing conventional DSP，and these enhance stability and reliability of system.Some tests prove that contradiction between tracking precision and dynamic performance is resolved basically.All required technical guideline of the system are achieved or exceeded.

Key words: frequency-locked loop, phase-locked loop, high dynamic synchronization, NiosII soft kernel processor