舰船地震波信号是非平稳信号，在低信噪比情况下，传统的谱分析方法不易检测其时域和频域特征。本文利用短时傅里叶变换和提出的RI-ALE-MUSIC算法分析舰船地震波信号的时频特性，结果表明测量舰船的地震波信号在时频域存在特定的线谱结构，且利用RI-ALE-MUSIC时频检测算法在信噪比很低的情况下依然可以有效检测到舰船目标，极大地提升了系统的探测距离。

Ship seismic wave signal is a non-stationary signal. In the case of low signal- to-noise ratio, the traditional spectral analysis method is not easy to detect its time domain characteristics and frequency domain ones. Here, the time-frequency characteristics of ship seismic wave signals were analyzed with the STFT method and the RI-ALE-MUSIC algorithm. The results showed that ship seismic wave signals have a specific line-spectrum structure in time-frequency domain; the RI-ALE-MUSIC time-frequency algorithm can be used to effectively detect ship targets in the case of low signal-to-noise ratio, it greatly increases the detection distance of the system.