在天基紫外探测系统中，定量地估计由地气背景浮动引起的杂波辐射有利于对不同场景探测通道(包括中心波长和光谱范围)的有效选择，提高对空间目标的综合探测性能。从空间信号传输的角度出发，在290~400 nm 的“紫外窗口”区建立了不同场景空间杂波辐射模型，并利用该模型分析了空间背景杂波辐亮度的主要影响因素。在可能的目标辐射特性与地气背景杂波水平下，对杂波影响下的系统探测性能进行了有效估算。结果表明：在晴空探测条件下，探测系统的中心波长和光谱范围应分别选为300 nm 和297~306 nm，而在完全充满卷云的视场，探测系统的中心波长和光谱范围应分别选为299 nm 和296~303 nm。

For the space-based ultraviolet (UV) detection system, quantitatively estimating the clutter radiance from the fluctuations of earth-atmospheric background is beneficial to effectively select the detecting channels (including middle- wavelength and spectral- range) in different scenes, and can improve the comprehensively detecting performance for the space target. Based on the space signal transfer, the space clutter radiance models in different scenes are established in the UV window of 290~400 nm. By means of the models, the main influence factors for the space background clutter radiance are analyzed. In the level of the possible target radiation characteristics and earth-atmospheric background clutter radiance, the detecting performance of system influenced by the clutter is effectively estimated. The results show that the middle-wavelength and spectral-range of detecting system should be 300 nm and 297~306 nm for clear sky, but 299 nm and 296~303 nm respevtively for the field of cirrus clouds.