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将脉冲激光调制成更窄脉宽的脉冲串,并作为激光雷达信源信号用于水下探测,在接收端采用窄带滤波器的方案被证明可以有效抑制海水后向散射对水下探测的影响。在实际应用中,在调制频率一定的情况下,接收端滤波器带宽设计直接决定系统对海水后向散射抑制能力。在研究海水水质参数与脉冲激光频率展宽的基础上,构建“海洋载波调制脉冲激光雷达”半实物平台进行仿真实验研究。半实物仿真表明,随着滤波带宽增大,对比度提升呈现出了先增大后缓慢下降的趋势。最后通过实验结果的对比分析给出了一种滤波器带宽设计方法。
Modulating pulsed laser pulses into narrower pulse width pulses and using them as lidar source signals for underwater detection, the use of narrow-band filters at the receiving end has been shown to effectively suppress the effects of seawater backscattering on underwater detection . In practical applications, the bandwidth of the receiver filter bandwidth directly determines the system’s ability to restrain the backscattering of seawater when the modulation frequency is constant. Based on the study of seawater quality parameters and the broadening of the pulse laser frequency, a simulation experiment was carried out to build a semi-physical platform of “marine carrier modulation pulse lidar”. The semi-physical simulation shows that as the filtering bandwidth increases, the contrast enhancement shows a tendency of first increasing and then slowly decreasing. Finally, a comparison of the experimental results gives a filter bandwidth design method.