对地下核爆炸产生的地震波信号进行联合时频分析 ,旨在研究核爆炸与天然地震信号在时频平面上的差异 ,为核监测提供鉴别判据。除将传统的时域、频域特征统一并推广为时频平面上的矩特征和复杂度特征之外 ,还提出了利用互模糊函数图像 ,时频平面上的时频面积比和累积分布等作为特征 ,对地震波进行更细致的分析。此外 ,将时频表示直接进行奇异值分解 ,用得到的少量奇异值作为一种正交变换特征 ,以减少特征空间的维数。给出了具体应用实例 Joint time-frequency analysis of seismic wave signals generated by underground nuclear explosions aims to study the difference of time-frequency plane between nuclear explosion and natural seismic signals and provide identification criteria for nuclear monitoring. In addition to the traditional time-domain and frequency-domain features unified and generalized to the moment features and complexity features on the time-frequency plane, the use of mutual ambiguity function images, time-frequency area ratio and cumulative distribution on the time-frequency plane As a feature, seismic waves are analyzed in more detail. In addition, the time-frequency representation is directly decomposed into singular values, and a small amount of singular values ​​are obtained as an orthogonal transform feature to reduce the dimensionality of the feature space. A specific application example is given