介绍了通过大气光谱特征分析对大气层外目标进行探测的波段选择方法.在考虑目标本身辐射强度、背景大气的辐射强度、目标背景对比度、斜程大气透过率以及探测器的响应特性诸因素后进行波段选择,从而提高对目标的鉴别性能.选择中纬度夏季白天、无云城市气溶胶模式、春夏季气溶胶廓线以及背景平流层廓线和消光的大气条件,利用辐射传输计算软件MODTRAN计算了目标背景亮度、对比度以及透过率的典型光谱特征,并进行光谱特征分析,然后在其他大气模式下对所选波段进行了验证,从而选择出目标探测的最优波段.

Wavelength band selection method for target detection which is out of the atmosphere based on character of atmosphere radiation is proposed in the paper. In order to improve the target identification performance, wavelength band is selected by considering the target radiance, the background radiance, the target background contrast, the transmittance of slanting path and the response character of the sensor. By adopting atmospheric condition of the midlatitude summer model in the daytime, no clouds urban aerosols, spring-summer aerosol profiles and background stratospheric profiles extinct model, the typical spectrum characters of target background radiance, contrast and transmittance are computed by the radiative transfer computation software MODTRAN, and then the spectrum characters in the wavelength bands are analyzed. From the analysis results and the validation in other atmosphere models, the optimal detection wavelength band is selected.