Alternating notch periodogram algorithm (ACPA) based on maximum likelihood (ML) can regarded as a complete solution to the discrete spectrum estimation problem since it achieves superresolution, very high accuracy, and low SNR threshold.

• 基于最大似然法的交替陷波周期图算法（ANPA）是一种超分辨率的谱估计算法，它同时具有超分辨率、高精度和低信噪比门限的特性。