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空间背景噪声是指空间背景里的物体热辐射散射和反射造成的非均匀红外光源。1965年曾对空间背景噪声频谱分布做过测试工作,用一维谱法测出空间背景噪声频谱分布。自然界空间背景噪声主要来自太阳,噪声的频谱分布和太阳照度及方位的关系很大。对人为制造的火源也进行了测试,结果表明其信息量很大。本文依据测试到的空间背景噪声谱,对搜索系统设计提出抑制背景噪声和抗干扰设计。1966年设计成高频调制、单缝扫描编码式调制滤波系统,调制编码的信息由光导管传递到双元(PbS,InSb)探测器上。将PbS接收的1～3μm红外信息转成相关抑制门限信号,其频率为70Hz,相关门宽为0.79 ms;再把InSb接收3～6μm的12600Hz信息送进抑制
Spatial background noise is the non-uniform infrared light source caused by the scattering and reflection of thermal radiation from objects in a spatial context. In 1965, the spectral distribution of spatial background noise was tested and the spectral distribution of spatial background noise was measured by one-dimensional spectral method. The background noise in nature is mainly from the sun. The noise spectrum has a great relationship with the illumination and azimuth of the sun. Anthropogenic sources of ignition have also been tested and the results show a great deal of information. In this paper, based on the spectrum of the tested background noise, the background noise and anti-jamming design of the search system is proposed. 1966 designed as a high-frequency modulation, single-slit scanning encoder modulation filtering system, the modulation and coding information transmitted by the light guide to the dual element (PbS, InSb) detector. The 1 ~ 3μm infrared information received by PbS is converted into the relevant suppression threshold signal, the frequency is 70Hz, the relevant gate width is 0.79ms; then the InSb receives 12600Hz information with 3 ~ 6μm into the suppression