中文摘要：

针对水下目标回波亮点结构的时频分布特性，采用一种时频域盲源分离方法将亮点结构进行分离。该方法将每一个亮点反射的信号视为一个源信号，可以在信号传输信道的混合特性及源信号个数均未知的情况下将回波信号中的各个亮点结构进行分离。首先推导论证了亮点结构在时频域盲源分离算法下的可分离性，通过仿真分析验证了该方法的有效性，并给出了该方法对于亮点间时延参数的适用条件。实验数据的处理结果进一步表明该方法在分析水下目标几何亮点回波的结构时有较好的应用。

英文摘要：

According to the time？frequency distribution characteristics of the highlight structures of underwater target echoes, a new method based on time？frequency domain blind source separation is adopted to separate the highlight structures from underwater target echoes. In this method, the reflected signal from each highlight is seen as one source signal, and all the highlights of echo can be separated without any a priori knowledge neither on the number of the sources nor on the mixture characteristics of the signal channel. Separability of the highlight structures is de？duced and proven based on the time？frequency domain blind source separation method. Simulation analyses have af？firmed the effectiveness of the method. The application condition of this method is given by changing the time delay parameter in the simulations. Experimental results show that the method can be well used in analyzing the structure of underwater target geometrical highlight echoes.