本文利用辐射传输软件包MODTRAN,详细分析了大气模式、地表状况以及气溶胶模式等诸多参数对0.43～0.75 μm波段范围内的目标背景对比度的影响,主要结果为:①季节变化给目标识别带来一定程度的影响,在同一种大气模式下,在冬季比在夏季更容易识别目标,但是季节变化仅改变C的大小,且变化幅度较小;②不同的大气模式下的C值随波长变化的分布形式发生变化,纬度较高的大气模式下C值较大,或者变化趋势较为明显;③地面反照率对C值的影响较小,同一波长对应的对比度的相对变化较小;④气溶胶模式的变化不仅影响C值的大小,而且改变了C值随波长的分布情况,但是这种影响与其他影响因素相比是很小的.

The problem about target discretion is very important in many applications. In this paper, detailed research about the effects under some typical atmospheric and ground conditions on the target-background contrast at 0.43-0.75 μm computed by the software package-MODTRAN has been carried out. And the results are provided as following description: the numerical values of contrast present subtle variety according to the seasons shift, and it is easier to identify targets in winter than in summer;both the numerical values and the distribution with wavelength of contrast present alternation according to the atmospheric models;similarly, the aerosol models affect both the numerical values and the distribution with wavelength of contrast.