CAJ | 학술논문

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1930 m 和1940 m 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。
재원거리약신호조건하，증익조제격광뢰체계통적측거정도수도강배경조성적엄중간우。위료제고계통적측거정도，종계통기본공작원리출발，대증익도상진행쌍역치화처리，득출료측거오차최소적역치조건；고필도역치처리대목표여배경존재착오판단，결합증익조제상적개솔분포함수정의료증익상화거리상적착오솔함수。선취거리분별위1930 m 화1940 m 적량좌건축물작위목표진행성상실험。실험결과표명：쌍역치화처리후，계통적측거편차감소료58.3%，종이험증료쌍역치화처리적가행성。통과대목표여배경실험결과적계산발현，목표거리적착오솔존재겁소치。
The characteristics of gain -modulation laser radar images seriously affected by noise in the condition of long distant and weak signal were studied. For the purpose of improving the ranging precision, the processing method with double thresholds was proposed on the basis of the basic principle of the laser radar system. The minimum ranging error equation was obtained from the basic operation principle of gain -modulation laser radar. Considering faulty judgments between target and background with double thresholds processing method, the error probability functions were defined for gain-modulated images and range images. Two buildings at the distance of 1 930 m and 1 940 m were selected as targets for an outdoor experiment. The results show that distance error was reduced by 58.3%; the feasibility of double thresholds processing method was proved. On the other hand, the results show the error probability on double thresholds has a minimum.