临近空间红外探测像面照度建模与仿真

Modeling and simulation of imaging plane irradiance for near space infrared detecting

低空突防目标飞行高度低、时间短,对其进行有效的探测一直是研究的重点和难题。以2.7μm、4.3μm作为探测系统的中心波长,建立了临近空间红外探测像面照度模型。模拟SBIRS天基红外系统和临近空间探测系统,仿真典型目标弹道,考虑大气影响,得到主动段、被动段红外辐射分别在SBIRS预警卫星和临近空间平台的像面照度及目标背景调制对比度。仿真结果表明:对于低空突防目标,临近空间平台较SBIRS拥有更高的信号对比度及更长的探测时间。在被动段,以4.3μm为探测中心波长探测效果好于2.7μm。

It has been the focus of the study for effective detection of low altitude penetration target which has low altitude, short flight time. To 2.7μm, 4.3μm wavelength as the center of the detection system, a near space infrared detection image plane irradiance model was established. SBIRS space-based infrared system and the near space detection system were simulated. Simulating typical target trajectory, considering the atmospheric effects, infrared radiation image plane irradiance and modulation contrast of object and background of boost phase and post-boost phase at SBIRS and near space platform were obtained. Simulation results show that near space platform has a higher signal contrast and a longer detection time than SBIRS. For TBM′s post-boost phase, the detection effect of 4.3μm is better than that of 2.7μm as detection center wavelength.