脉冲展宽对机载激光扫描仪性能的影响  

Effect of Pulse Spreading on the Ranging Performance of Airborne Laser Scanner

作　　者：郭冠军[1] 焦威严[1] 曲士良[1] 陈相君[1] 

机构地区：[1]哈尔滨工业大学(威海)光电科学系,山东威海264209

出　　处：《光电工程》2010年第3期51-55,60,共6页Opto-Electronic Engineering

基　　金：哈尔滨工业大学校基金项目(B200619)

摘　　要：激光回波脉冲展宽是影响机载激光扫描仪性能的重要因素之一,本文给出了脉冲展宽与扫描角度和航高之间的关系;分析了回波功率由于脉冲展宽所导致的衰减;研究了脉冲展宽对系统信噪比和测量精度的影响;给出了机载平台所允许的最大飞行高度与系统参数之间的关系。计算表明随扫描角度的增加,脉冲展宽自航带中心逐渐增大,回波功率和信噪比随扫描角度的增加急剧衰减;在航带不同位置,测距精度不同,在航带中心最高,在航带边缘最低。The pulse spreading is one of the dominant factors that influence the ranging performance of the airborne laser scanner. Firstly, the dependence of the backscattered pulse width on the flying height and the scanning angle was analyzed, and then the attenuation of the backscattered power due to pulse spreading was investigated. The influence of the pulse spreading on the system＇s Signal-to-noise Ratio （SNR） and the ranging accuracy was studied. The maximu.N flying height of aircraft was analyzed based on the scanning angle and the platform flying height and the system＇s parameters. The simulations indicate that the width of the back-scattered laser pulse increases considerably from the centre to the edge of the air strip. The received power and SNR decrease sharply with the increase of the scanning angle. The ranging accuracy is variable, and decreases sharply from the centre to the edge of the air strip .

关 键 词：激光扫描仪 脉冲展宽 回波功率 飞行高度 

分 类 号：TN249[电子电信—物理电子学]