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频谱分析已被广泛应用于信号处理技术中。本文介绍了瞬时频率序列分析方法，讨论了频谱分析与时间域瞬时频率分析之间的关系．重点介绍了瞬时频率序列及其低阶矩在水声信号处理中的应用．海试及湖试结果与理论分析和计算机仿真结果一致．本文提出的瞬时频率方差估计器用于窄ＣＷ脉冲的检测可显著提高抗脉冲干扰的能力。
Spectrum analysis has been widely used in signal processing techniques. This paper introduces the method of instantaneous frequency sequence analysis, and discusses the relationship between spectrum analysis and time domain instantaneous frequency analysis. The application of instantaneous frequency sequence and its lower moments in underwater acoustic signal processing is mainly introduced. Sea test and lake test results are in good agreement with theoretical analysis and computer simulation results. The proposed instantaneous frequency variance estimator for the detection of narrow CW pulses can significantly improve the anti-pulse interference ability.