中国激光, 2020, 47 (10): 1010001, 网络出版: 2020-10-09
相干激光微多普勒雷达的干扰抑制研究 下载: 920次
Interference Suppression of Coherent Laser Micro Doppler Radar
遥感 干扰抑制 微多普勒效应 振动目标 补偿 remote sensing interference suppression micro Doppler effect vibration target compensation
摘要
目标微多普勒特征可作为目标识别的依据,其探测往往受到激光雷达自身在激光束方向上振动的影响,并且测量结果受到本地振动的影响。提出了一种利用目标自身参考点来抑制本地干扰的方法,分析了目标待测位置和参考位置的回波与本地振动信号的拍频信号,并进行补偿处理,从而达到抑制本地振动、目标相对运动干扰的目的。实验结果表明,所提方法对本地振动和目标相对运动干扰的抑制具有显著的效果,相对补偿精度小于5%,补偿后得到的微多普勒特征能较好地反映目标真实的微振动形式。
Abstract
The micro Doppler features of a target can be used as the basis of target recognition. The detection of micro Doppler features is often affected by the vibration of lidar itself in the direction of laser beam, and it is difficult to eliminate the influence of local vibration on the measurement results. In this paper, a method of using the reference point of the target itself to suppress local interference is proposed. The local vibration and relative motion interference can be suppressed by analyzing the beat frequency signal between echo signals from the target position and reference position and the local vibration signal and by the compensation process. Experimental results show that the proposed method has a significant effect on the suppression of local vibration and target relative motion interference, and the relative compensation accuracy is less than 5%. The micro Doppler characteristics obtained after compensation can better reflect the real micro vibration of the target.
李跃新, 孙建锋, 周煜, 卢智勇, 蔡新雨, 从海胜. 相干激光微多普勒雷达的干扰抑制研究[J]. 中国激光, 2020, 47(10): 1010001. Li Yuexin, Sun Jianfeng, Zhou Yu, Lu Zhiyong, Cai Xinyu, Cong Haisheng. Interference Suppression of Coherent Laser Micro Doppler Radar[J]. Chinese Journal of Lasers, 2020, 47(10): 1010001.