摘要
基于最小可分辨对比度准则,研究了在考虑背景环境下机载红外成像系统对目标最大探测距离的计算方法。分析了红外目标在3～5μm与8～12μm两个波段上的红外辐射特征和背景辐射、大气透过率等因素对探测距离的影响,给出了探测距离的推导公式。最后用MODTRAN软件对大气透过率进行了模拟计算,得到了波数间隔为1cm^(-1)的光谱大气透过率数据。计算了各微小波长区间内辐射到探测器上的辐照度。考虑到大气透过率与距离的关系,取消了传统算法中用常数或者拟合函数来代替大气透过率的方法。以巡航导弹为例,对红外系统探测距离进行了数值计算。仿真结果表明,该计算方法具有可行性。
According to the minimum resolvable contrast criterion, the method for calculating the maximum detection range of an airborne infrared imaging system to a target in a background environment is studied. The infrared radiation characteristics of the infrared target in two wavebands of 3 to 5 μm and 8 to 14 μm and the influence of background radiation and atmospheric transmittance etc on the detection range are analyzed. The derivative formula of the detection range is given. Finally, the atmospheric transmittance is simulated with the MODTRAN. The atmospheric spectral transmission data with a wave number interval of 1 cm^-1 is obtained. The irradiance on the detector in each mini wavelength region is calculated. By taking the relationship between the atmospheric transmittance and the distance, the replacement of atmospheric transmittance by constant or fitting function in the traditional algorithm is canceled. Taking the cruise missile as an example, the detection range of an infrared system is calculated numerically. The simulation result shows that this calculation method is feasible.
出处
《红外》
CAS
2013年第3期26-31,共6页
Infrared
基金
江苏省电磁波先进调控技术重点实验室开放基金(2011ESE002)
