机载光电设备对高空气球的光谱可见性分析

对高空气球与机载探测器所处环境特性进行分析,利用MODTRAN大气传输模型计算了相同时刻下不同探测点的背景噪声强度,和不同时刻下目标处的背景光亮度,采用反向蒙特卡罗法计算出空基探测点处接收到的高空气球的散射亮度,计算出探测数据的信噪比,并就目标的光谱可见性进行了分析。计算表明,机载探测时,当目标位置与探测高度固定的情况下,探测夹角越小,目标的太阳天顶角越大,则探测信噪比越高,越容易满足探测仪器的阈值并有利于探测谱段的选择。

Analysis of visibility of high-altitude balloon on the spectrum by using airborne optoelectronic device

The paper analyzed the characteristics of the environment where the high-altitude balloon and the airborne detector work.By using the atmospheric transporting model(MODTRAN),the paper calculated the background noise intensity under the condition of the same probe point and the different time and the background brightness of the target at the different time.By using the backward Monte Carlo method,the paper calculated the scattering radiance of the high-altitude balloon received at the space-based probe point.After calculating the signal to noise ratio(SNR),the paper made an analysis of the visibility of the target.The results show that,during the airborne detection,with the smaller detecting angle or the greater solar zenith angle of the target,SNR is higher to satisfy the threshold of the detection equipment,which is also beneficial to the choice of spectral bands when the target location and the detecting altitude are both fixed.