基于锁相环原理的反馈逼近式频率估计算法

he carrier recovery is an important link of communication. This paper analyzes the sine wave frequency estimation Rife and the improved algorithm's principles and performance, and proposes a kind of feedback approximation frequency estimation algorithm based on phase lock loop; To the same frequency estimation results conditions, we compare the complexity of algorithm between feedback type algorithm and traditional Rife algorithm, in input SNR less than 6 db, feedback type algorithm need less calculation.