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红外系统的探测能力就是它对目标辐射的响应和对背景的抑制能力。目前红外系统中常用的抑制背景干扰的手段有光谱滤波、空间滤波、电子滤波、热成像等技术。本文对中红外导引头光谱滤波问题进行了一些分析研究,讨论了确定光谱区间的基本原则和选择方法,给出了适应不同要求的光谐区间实例,并对这些实例进行分析比较,还给出了实现这些实例的具体方法。红外导引头是一种对比度探测装置,它必须对给定的目标及可能存在的背景有足够强的对比响应度。因此,必须合理地选择系统的起止波长和光谱带宽。理想的情况是按照目标、背景和大气传输特性,在目标信号对背景噪声之比为最大的光谱位置,选取尽量小的光谱带宽以获得最大的系统信噪比。
The detection capability of the infrared system is its ability to respond to the target radiation and to suppress the background. Currently used in infrared systems to suppress background interference means spectral filtering, spatial filtering, electronic filtering, thermal imaging and other technologies. In this paper, the spectral filtering of mid-infrared seeker has been analyzed and discussed. The basic principles and selection methods of spectral range determination have been discussed. The examples of optical harmonic interval to meet different requirements have been given. The examples are compared and returned Out of these examples of specific ways. An infrared seeker is a contrast detector that must have a sufficiently strong contrast responsiveness to a given target and its possible background. Therefore, the system’s starting and ending wavelength and spectral bandwidth must be chosen rationally. Ideally, the smallest spectral bandwidth should be chosen for the maximum system SNR based on the target, background, and atmospheric transmission characteristics at the spectral location where the ratio of target signal to background noise is maximized.