可见光载荷对云海背景下某型隐身飞机探测能力研究OA

In order to study the detection capability of visible light detector to a certain stealth aircraft,firstly,a multidirectional absorption-scattering model for coupled cloud-sea-atmosphere background in visible light band is established.Then,by modeling and analyzing the reflection characteristics of the geometric cross section of the aircraft skin and tail flame under different solar incidence angles and satellite observation angles,the spectral ener-gy distribution of the target and the background reaching the focal plane of the detector are calculated,so as to get the minimum signal to noise ratio for image recognition and maximum detection range in the given lighting condi-tions.Finally,the simulated imaging results verify the correctness of the analysis model and the reliability of the conclusion.The analysis results are shown as follows:When the cloud and sea are taken as the background of ground object observation,the upward reflection characteristics of clouds have the most significant influence on the detectability of aircraft;when the solar incidence angle is less than 60°,the surface bidirectional reflectance distribution function(BRDF)of the aircraft skin is obviously higher than that of the sea surface;when the solar in-cidence angle exceeds 60°,the reflection of sunlight by clouds and sea surface dominates.