光尾流自导中抗干扰技术研究

Study of Anti-interference Technology in Laser Wake Detection

光尾流自导系统是一个光电复合系统,它利用含气泡尾流与纯净海水介质对光的散射与吸收的差异来实现对尾流的检测和跟踪。其干扰来自光学和电学两方面,主要包括光功率波动、水中的粒子散射、自然光及电路干扰等。该文分析了这几种干扰对系统的影响,并根据其各自的特点,分别采用自适应算法抑制光功率波动及水中粒子散射的干扰,采用加装滤光片和后续信号处理算法抑制自然光的干扰,采用电源滤波和覆地技术等减小电路的干扰,取得了良好的效果,提高了系统的稳定性。

The system of laser wake detection is a laser-electric compound one. It can detect and trace wake bubbles based on the differences of light absorbing and scattering between pure seawater and the seawater containing bubble wake. The interferences with the laser wake detection system are both optic and electronic, mainly including laser power flnctnant , light scattering on particles in water, natural light and electrical circuit. According to the analysis of the interferences with the system performance, this paper uses adaptive algorithm to restrain the laser power fluctuation and the light scattering on particles in water, applies filter slice and signal processing algorithm to restrain the interference of natural light, and adopts power filter and covering ground technique to reduce the interference from electrical circuit. The experimental results demonstrate the improved performance and stability of the laser wake detection system.