高温窗口作用下红外导引头性能建模与评估

高超声速飞行器的高温窗口会对红外导引头成像性能产生严重影响。为了定量分析高温窗口效应，通过红外导引头信号响应特性和高温热辐射特性耦合的方法，建立了高温窗口作用下的红外导引头成像量化表征模型，并利用典型红外导引头系统高温窗口实验对该模型进行验证。基于量化表征模型，结合外场试验获取的船海辐射数据，实现了多种温度窗口作用下红外导引头成像结果计算，并对高温窗口作用下的红外导引头成像性能进行评估分析。分析结果表明:当窗口温度超过250℃时，肉眼基本无法通过图像分辨船只；当窗口温度超过300℃时，基本无法通过导引头识别算法实现目标的分辨和跟踪。

Modeling and evaluation of infrared seeker in high temperature window

The high temperature window of a hypersonic vehicle can have a severe impact on the imaging performance of the infrared seeker. In order to quantitatively analyze the high temperature window effect, the imaging and quantitative characterization model of the infrared seeker in high temperature window was established through the coupling of the signal response characteristics of the infrared seeker and the high temperature thermal radiation characteristics. The quantiative charateriation model was verified by high temperature window experiment of typical infrared seeker system. Based on the quantitative characterization model, combined with the ship radiation data obtained from the external field test, the imaging results of the infrared seeker under various temperature windows were calculated, and the imaging performance of the infrared seeker under the high-temperature window was evaluated. The analysis results indicate that when the window temperature exceeds 250℃, the naked eye can hardly distinguish the ship through the image; when the window temperature exceeds 300℃, the target resolution and tracking cannot be achieved by the seeker recognition algorithm.