回波信号对激光雷达主动成像质量的影响研究

Study on the effect of echo signal on the active imaging quality of lidar

采用时频分析回波信号对激光雷达主动成像质量的影响时,由于缺乏回波信号的去噪过程,存在运行耗时长和复杂度高的弊端,提出一种新的回波信号对激光雷达主动成像质量的影响研究方法,采用经验模式分析法依照不同特征时间尺度划分回波信号为不同IMF分量,删除携带噪声的IMF分量,实现对回波信号的去噪;在此基础上研究激光雷达主动成像运动目标速度与回波信号中脉内多普勒特征关系,得到多普勒耦合时移对匀速成像运动目标和非匀速成像运动目标激光雷达主动成像质量无影响和较强影响,获取最佳成像运动目标速度,实现回波信号对激光雷达主动成像质量的影响研究。实验结果说明,所提方法能有效分析回波信号对激光雷达主动成像质量的影响,且方法运行耗时和计算复杂度的平均评价分别为96. 6分和96. 7分,实用性强。

When using time-frequency analysis of the influence of echo signal on the active imaging quality of Lidar,due to the lack of noise removal process of echo signal,there are disadvantages of long running time and high complexity,and a new kind of echo signal is proposed.The influence research method of Lidar active imaging quality,Based on the different characteristic time scale,the IMF component of the echo signal is divided into different IMF components by empirical mode analysis method.On this basis,the relationship between the motion velocity of the Lidar active imaging target and the Doppler feature in the echo signal is studied,and the Doppler coupling time shift has no effect on the active imaging quality of the uniform imaging target and the non-uniform imaging target.Gets the best imaging motion target speed.Study on the influence of echo signal on the quality of Lidar active imaging.The experimental results show that the proposed method can effectively analyze the influence of echo signal on the quality of Lidar active imaging,and the average evaluation of the time spent and computational complexity of the method is 96.6 points and 96.7 points,respectively,which is practical.