Two methods of detecting quasiperiodic signals—the well-known method of calculating correlation coefficients and the method of a morphological analysis that makes it possible to detect signals with variable phases, which is important in isolating signals at long distances from their sources—are compared. The efficiency of a morphological analysis is in solving the problems of isolating quasiperiodic signals against the background of noise that is comparable to or exceeds (in amplitude) the signal under study. These two methods are compared using subwoofer signals recorded in August 2009 at the Scientific Station of the A.M. Obukhov Institute of Atmospheric Physics. The signal frequencies were chosen within a range of 45–130 Hz and the distance to the source was from 0 to 1255 m. Signals were recorded during night and morning hours, which made it possible to study the potentialities of these methods in isolating a desired signal under both disturbed and undisturbed states of the atmosphere (in the absence or presence of noise of different origins).

中文翻译：

---

检测通过大气传播的特定声学信号的相关性和形态学方法

比较了两种检测准周期信号的方法——众所周知的计算相关系数的方法和可以检测具有可变相位的信号的形态分析方法，这对于隔离远离其源的信号很重要。形态分析的效率在于解决将准周期信号与噪声背景相比较或超过（幅度）所研究信号的问题。使用 2009 年 8 月在 AM Obukhov 大气物理研究所科学站记录的低音炮信号对这两种方法进行了比较。信号频率选择在 45-130 Hz 范围内，到源的距离为 0 到 1255 m。在夜间和早晨记录信号，