基于独立成分分析的舰船气泡尾流后向散射光信号处理

光尾流自导鱼雷激光探测系统所获取的信号是水体和舰船气泡尾流共同产生的后向散射光信号，从该信号中提取出舰船气泡尾流的信息是光尾流自导鱼雷的关键技术。由于水体所产生的后向散射光信号强度大于舰船气泡尾流所产生的后向散射光信号，两个信号在时域和频域里的特征又十分接近，因此难以用传统滤波方法将其分离以提取有用的尾流信息。提出了采用盲源分离和独立成分分析的方法来处理激光探测系统所获取的信号，研究了盲源分离的算法，编制程序对课题组在激光探测舰船尾流海上试验所获取的数据进行了计算，结果表明:该方法可在不同探测条件下有效地将舰船气泡尾流场所产生的后向散射光信号从原始信号中提取出来，有利于系统正确判别舰船尾流及其特征。

Processing of backscattering signal of warship wake flow based on independent component analysis

The signal obtained by self-guided torpedo by laser is the backscattering signal of warship wake flow and sea water, from which extracting the backscattering signal of warship wake flow is the key point of realizing the self-guided torpedo by laser. While the backscattering signal of water constantly influences the detection of backscattering optical signal of warship wake flow, and it is stronger than the needed signal, the characteristics of the two signals in time domain and frequency domain are very similar. So the separation of these two signals can not be realized with the traditional method effectively. The blind source separation and independent component analysis theory were used to process the signal obtained by laser detection system, and the experiment data was calculated by the software complied in the independent component analysis ideology. The results show that this method can extract the backscattering signal of wake flow from the original signal effectively in different condition, which can help the system judge the warship wake flow and its characteristics.