机载全波激光雷达波形影响因素分析（英文）

Analysis of influencing factors of airborne full-waveform lidar echoes

机载全波激光雷达是通过处理返回波形获取地面信息的主动遥感技术。介绍了关于机载全波激光雷达回波影响因素的一些新发现。根据建立的合成回波模型,首先仿真和分析了三种典型地形的回波,然后讨论了地面反射率和探测器响应对回波波形的影响。通常具有一定高度差的阶梯地形或者一定频率的正弦地形回波会产生裂变。但是笔者发现如果探测器响应相对慢时,回波波形不会产生裂变,并且指出回波波形下降沿展宽不是由斜坡引起,而是由探测器慢响应产生。

Airborne full-waveform lidar is an active remote sensing technology to obtain the information of earth’s surface by processing the returned waveforms. Some new findings about influencing factors of airborne full-waveform lidar echoes were presented. According to the built synthesized echo model, the returned waveforms of three kinds of typical terrains were simulated and analyzed. Afterwards, the influences of reflectivity and detector response on the echoes were discussed. Normally, the echo will produce a fission under the ladder terrain of a certain altitude difference or under the sinusoidal terrain of a certain frequency, but it is found that the echo would not produce fission if the detector response is relatively slow. It is also found that the reason for the echo falling edge broadening is the slow detector response rather than the terrain slope.