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在远距离弱信号条件下,增益调制激光雷达系统的测距精度受到强背景噪声的严重干扰。为了提高系统的测距精度,从系统基本工作原理出发,对增益图像进行双阈值化处理,得出了测距误差最小的阈值条件;考虑到阈值处理对目标与背景存在错误判断,结合增益调制像的概率分布函数定义了增益像和距离像的错误率函数。选取距离分别为1930m和1940m的两座建筑物作为目标进行成像实验。实验结果表明:双阈值化处理后,系统的测距偏差减小了58.3%,从而验证了双阈值化处理的可行性。通过对目标与背景实验结果的计算发现,目标距离的错误率存在极小值。
Under the condition of long distance weak signal, the ranging accuracy of gain modulation Lidar system is seriously disturbed by strong background noise. In order to improve the ranging accuracy of the system, starting from the basic working principle of the system, the gain image is double-thresholded, and the threshold condition with the smallest ranging error is obtained. Considering the misjudgment of the target and background in the threshold processing, The probability distribution function of image defines the error rate function of gain image and distance image. Two buildings at a distance of 1930m and 1940m, respectively, were selected as imaging targets. The experimental results show that the system’s ranging error is reduced by 58.3% after double-thresholding, which verifies the feasibility of double thresholding. Through the calculation of the experimental results of the target and the background, it is found that the error rate of the target distance has a minimum value.