影响水下距离选通激光图像光学相关识别的若干因素

Factors affecting results of optical correlation recognition for underwater laser imaging

针对水下距离选通激光图像光学相关识别技术的应用,研究了引起图像畸变从而导致光学相关识别相关峰输出效率降低的若干因素,并通过实验的方法采集了不同系统参数设置下的激光成像图片,然后采用相位匹配的方法对图片进行相关性分析,同时应用PCE、Disc等指标联合评价输出的相关峰质量,从而衡量各因素所引起的成像畸变对光学相关识别性能的影响程度。MATLAB软件仿真结果证明:激光单脉冲能量、ICCD增益、成像距离等因素变化均会引起图像相位特征畸变,导致相关识别鉴别率降低。该结果可为建立水下距离选通成像系统控制模型和设计匹配滤波器提供参考。

The relationship between the underwater laser imaging and correlation peak output was studied for the application of optical correlation recognition to underwater range-gated laser images. Firstly, the optical recognition peak output efficiency varying with image distortion was analyzed, and the factors leading to image distortion were discussed. Secondly, the phase matching correlation was used to analyze the underwater laser images collected in experiments according to the different system parameters which were set and the joint evaluation of the correlation output with peak value, PCE, Disc and other indicators was adopted to measure the optical correlation recognition performance. MATLAB simulation results show that the single laser pulse energy, ICCD gain, imaging distance and other factors will cause the distortion of the image phase characteristics, and further lower recognition rate. The results can provide a reference for the establishment of the underwater range-gated imaging system control model and the design of matched filter.