【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。更多还原

【Abstract】 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 maximum 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.更多还原