天空光辐射亮度是大气光学特性的重要参数之一，在空间目标探测与识别中有着重要作用。为了获取天空光辐射亮度，评价光电系统探测跟踪空间目标的能力，设计实现了一套天空光辐射亮度测量系统，详细介绍了光信号收集和信号探测部分的工作原理，及系统所应用弱辐射信号探测、辐射计量等关键技术。通过该套测量系统的初步应用及对测量结果分析表明：利用该套测量系统能够准确获取天空光连续光谱(光谱范围从380nm～1100nm)数据，为应用研究提供了更多的光谱信息。

Since sky-light radiation luminance is a critical parameter of atmospheric optics, it is very important for space target detection and identification. In order to acquire sky-light radiation luminance and evaluate the detection and tracking capability of optoelectronic systems for space target, a measurement system of sky-light luminance was designed and implemented. The work principles of optical signal collection and signal detection，and key techniques such as low-radiation signal detection and metrology of optical radiation used by the system were introduced. The system was applied to measure sky-light radiation luminance and the test result was analyzed. The result indicated that sky-light spectra(380nm～1100nm) could be acquired by the measurement system and more information was provided.