增益调制激光雷达弱信号的双阈值处理分析

发布时间：2018-06-21 18:15

本文选题：激光雷达 + 弱信号　；参考：《红外与激光工程》2014年08期

【摘要】：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。
[Abstract]:Under the condition of long range weak signal, the ranging accuracy of gain modulated 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 double threshold processing of gain image is carried out, and the threshold condition of the minimum ranging error is obtained, considering that the threshold processing has errors in judging the target and the background. The error rate function of gain image and range image is defined by combining the probability distribution function of gain modulation image. Two buildings with a distance of 1930m and 1940m were selected for imaging experiment. The experimental results show that the range deviation of the system is reduced by 58.3% after double threshold processing, which verifies the feasibility of double threshold processing. It is found that the error rate of target distance is minimized by calculating the experimental results of target and background.
【作者单位】：哈尔滨工业大学可调谐激光技术国家重点实验室;哈尔滨工业大学物理系;
【基金】：国家自然科学基金(61102147) 中国博士后科学基金(20100481004) 中央高校基本科研业务费专项资金(2011012)
【分类号】：TN958.98

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