【摘要】 基于全相位时移相位差法的振幅调制(AM)信号载频估计算法采用特殊时移位数进行频率估计，未能完全消除载频估计过程中的相位模糊。针对该问题，对全相位时移相位差载频估计算法进行一般性讨论，结合相位压缩运算，对AM信号载频估计算法进行了改进，提出了时移位数L不大于频谱分析点数N时能够消除相位模糊的一般性校正方法。仿真结果表明，在L=N时，改进后算法的载频估计精度对比改进前获得了明显提高，改进方法有效；改进后算法能够在任意L≤N情况下消除相位模糊，通过灵活选择L可以节省系统所需的存储量与计算量，进一步提高了载频估计的效率。更多还原

【Abstract】 The carrier frequency estimation algorithm of AM signal based on all-phase time-shift phase difference method uses special time shift number to estimate the frequency, which can not completely eliminate the phase ambiguity in the process of carrier frequency estimation. To solve this problem, this paper discusses the carrier frequency estimation algorithm of all-phase time-shift phase difference in general, and improves the carrier frequency estimation algorithm of AM signal combined with phase compression operation, and proposes a general correction method to eliminate phase ambiguity when the number of time shift L is not larger than the number of spectrum analysis points N. Simulation results show that when L=N, the carrier frequency estimation accuracy of the improved algorithm is significantly improved compared with that before the improvement, and the improved method is effective. In addition, the improved algorithm can eliminate phase ambiguity under any L≤N condition, and the storage and calculation amount required by the system can be saved by flexibly selecting L, which further improves the efficiency of carrier frequency estimation.更多还原