结合距离选通技术在机载激光主动成像中的应用,对距离选通模型参数的时序关系进行了分析,得出了大气后向散射范围和单位截面的脉冲前点和后点时刻;给出了大气后向散射光强计算方法,并对机载激光主动成像斜程探测距离进行了修正;利用散射截面上点的物像关系,建立了探测成像系统光路图,给出了散射截面反射点与增强电荷耦合器(ICCD)探测器面接收点位置光强的对应关系;通过数字仿真分别得到水平和斜程探测器面光强的变化规律,以及像面上的光强分布情况;搭建了外场实验平台,得到实测结果与仿真结果的数据相对误差基本控制在5%以内,具有很好的符合程度,实测结果验证了所建模型的实效性。 Combined with the application of distance gating technique in airborne laser active imaging, the timing relationship of the parameters of distance gating model was analyzed, and the pre-pulse and post-point moments of atmospheric backscattering range and unit cross-section were obtained. The calculation method of the atmospheric backscattering intensity was revised and the range of the active laser scanning was modified. The optical path of the imaging system was established by using the object-image relationship of the points on the scattering cross section. The scattering cross-section reflection points And the corresponding intensities of the intensities at the receiving points of the ICCD detector. The variation law of the light intensities of the horizontal and oblique detectors and the light intensity distribution on the image plane are obtained by digital simulation respectively. The experimental results show that the relative error of the measured data and the simulated data is within 5%, which shows good agreement. The measured data verify the effectiveness of the proposed model.