摘要
基于最小分辨对比度准则 ,研究了天空背景下红外点目标的最大探测距离估计方法。首先 ,分析了红外波段大气辐射传输与衰减、对比度限制光电成像系统功率响应特性 ,建立了目标表观对比度模型 ,并推导出了由气溶胶消光系数和距离参量确定的探测距离方程。然后 ,对目标天空背景温差、发射率 ,气溶胶衰减系数 ,瞬时视场、对比度探测阈值以及辐射波长等参数作了详细讨论。最后 ,利用LOWTRAN7程序的典型大气模式数据 。
This paper investigates the approach to estimate the maximum detection range of an infrared point_target against sky background based on the minimum resolved contrast(MRC)criteria. Firstly, the characteristics of radiation propagation and attenuation in the atmosphere, and the power response of a contrast_limited optoelectic system are analyzed, the apparent contrast model of a target is developed, and the detection range equation dependent on the aerosol extinction coefficient and range parameter are derived. Secondly, other parameters such as temperature difference and emissivity of target and sky, molecular absorptive transmittance, instantaneous field of view (IFOV), contrast threshold and radiant wavelength are discussed in detail. Finally,the numerical simulations related to infrared point_target detection range are executed using typical atmospheric data output form LOWTRAN7 code.
出处
《光学精密工程》
EI
CAS
CSCD
2002年第3期276-280,共5页
Optics and Precision Engineering
基金
国防预研基金 (No .96J2 0 4 .1ZK10 0 3)
