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本文介绍了脉冲激光束远区场的时空分布，导出了机载脉冲激光对地面扫描探测时回波脉冲的时域表达关系，通过数值计算得到了回波脉冲波形及其有关参数随扫描倾角的变化规律，结果表明不同波束倾角时回波脉冲特征发生了明显的变化。
In this paper, the temporal and spatial distribution of the far-field of pulsed laser beam is introduced, and the time-domain expression of the echo pulse when the airborne pulsed laser is scanned on the ground is deduced. The echo pulse waveform and its related parameters are obtained by numerical calculation The results show that the characteristic of echo pulse changes obviously with different beam inclination.