【摘要】 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。更多还原

【Abstract】 It has been proved that backscatter can be significantly reduced under water detection when laser source was modulated to be of narrower pulse at the emitter and echo was detected by narrow-band filter at the receiver.In practical applications,filter bandwidth is the key parameter for suppression of backscatter when modulation frequency has been determined.Based on previous study on seawater parameters and pulse frequency expanding characteristics,an "ocean modulated lidar" semi-physical simulation platform was established to study filter bandwidth.It is concluded that target contrast will firstly increase and then decline slowly with the increase of filter bandwidth.By comparing the experimental results,a method of filter bandwidth design was presented.更多还原