星载激光告警系统的背景辐射特性研究

阐述了星载激光告警系统在空间环境下的各种背景辐射源的辐射特性,以400 km的低轨道侦察卫星的激光告警系统为例,建立了各种辐射源在宿主星位置处的光谱辐照度模型,并进行了数值计算;假定告警系统告警波长为1.315 μm,探测器工作波段为1～3 μm,计算了各辐射源在宿主星位置处对应1.315 μm波长的光谱辐照度和1～3 μm波段内的总辐照度,并进行了比较分析,结果表明:星载告警系统的主要背景辐射源为太阳和地球,它们在告警波长处的光谱辐照度分别为39.9 mW/cm~2,10.9 mW/cm~2,在1～3 μm波段内的总辐照度分别为38.9 mW/cm~2,10.35 mW/cm~2,在实际工作中应采取研究专门的背景抑制技术对太阳辐射和地球辐射进行有效抑制.

Study on background radiation characteristic of satellite borne laser warning system

The background radiation characteristic of space-borne environment is introduced.Taking laser warning system of LEO reconnaissance satellite with a height of 400 km for example,host satellite's spectral irradiance model of every radiation source is built,and numerical calculation ia carried on;Supposing alarm wavelengh of laser warning system is 1.315 μm and the detetor's working waveband is 1～3 μm,in the place of host satellite,the 1.315 μm spectral irradiance and the total irradiance of 1～3 μm of every radiation source is calculated.Through analysis and comparison,the results show that:the main background radiation sources of satellite borne laser warning system are the sun and the earth;the corresponding spectral irradiance in the alarm wavelengh is 39.9 mW/cm~2 and 10.9 mW/cm~2,and in the waveband of 1～3 μm,the total irradiance is 38.9 mW/cm~2 and 10.35 mW/cm~2.So effective background suppression methods must be studied to eliminate the influence of solar radiation and terrestrial radiation.