CAJ | 학술논문

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。
침대수하목표회파량점결구적시빈분포특성，채용일충시빈역맹원분리방법장량점결구진행분리。해방법장매일개량점반사적신호시위일개원신호，가이재신호전수신도적혼합특성급원신호개수균미지적정황하장회파신호중적각개량점결구진행분리。수선추도론증료량점결구재시빈역맹원분리산법하적가분리성，통과방진분석험증료해방법적유효성，병급출료해방법대우량점간시연삼수적괄용조건。실험수거적처리결과진일보표명해방법재분석수하목표궤하량점회파적결구시유교호적응용。
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.