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为了改善现有水下激光距离选通成像建模方法在收发时序和器件特性方面的不足,提出了一种改进的系统模型。该模型以一维(1D)方波信号为研究对象,通过计算该信号的输出信噪比来评价成像系统的性能。模型考虑了水下激光脉冲的时域展宽和增强型电荷耦合装置(ICCD)的增益噪声特性以对现有模型的不足进行改进。通过模拟计算与实际水下激光距离选通成像系统所采集的图像相对比的方法验证了模型正确性,又通过对系统在不同水质下极限探测距离的仿真计算表明距离选通技术对人形暗目标的探测、识别和认清距离达到了9,7.5和7个衰减长度,从而证明了距离选通技术能够有效探测劣质水况下的中小目标。
In order to improve the shortcomings of the current underwater laser distance gating imaging modeling method in the transceiver timing and device characteristics, an improved system model is proposed. The model takes a one-dimensional (1D) square wave signal as the research object and evaluates the performance of the imaging system by calculating the output signal-to-noise ratio of the signal. The model takes into account the time-domain broadening of underwater laser pulses and the gain-noise characteristics of an enhanced charge-coupled device (ICCD) to improve the deficiencies of existing models. The correctness of the model is verified by simulating the image acquired by the real underwater laser distance gating imaging system and the simulation calculation of the limit detection distance of the system under different water quality shows that the gating technology of the underwater ghost target Of the detection, identification and recognition of the distance reached 9, 7.5 and 7 attenuation length, which proved that the distance gating technology can effectively detect low-water conditions in the small and medium-sized target.