基于参考源的空间目标红外辐射特性测量

Measurement of infrared radiation characteristics of spatial target based on reference source

地基测量是获取空间目标红外辐射特性的主要手段。地基测量由于大气影响,测量结果含有严重误差。利用由大气光学参数测量设备和辐射传输软件构成的大气同步修正系统,可以减小大气影响引入的误差。然而,由于典型大气模式和测量参数精度限制,经大气修正后的测量误差仍高于20%。提出一种基于红外标准星的辐射测量方法,使用与目标具有相近观测仰角的红外标准星作为参考源,准确获取空间目标观测光路上的透过率,分析了水汽、臭氧和观测仰角对透过率精度的影响。进行了红外星测量实验,利用文中方法测量的目标辐射误差为4.65%,明显优于传统方法的14.57%。结果说明文中方法能作为一种获取空间目标红外辐射的有效途径。

Ground-based measurement is a principal method to obtain the infrared radiation characteristics of spatial target. The measuring result contains significant deviation caused by the atmosphere＇s influence. The deviation can be reduced by using atmospheric synchronous correction system, which is composed of atmospheric optical parameters measurement equipment and radiation transfer software. However, due to the restriction of typical atmosphere models and precision of measured parameters, the corrected measurement accuracy is also greater than 20%. A radiation measurement method based on infrared standard star was proposed by using standard star which view pitch angle approximated to spatial target＇s as a reference source, which could obtain precisely the transmittance of optical path from measurement system to spatial target, and the transmittance accuracy affected by water vapor, ozone and observation elevation were analyzed. The experiment of measuring the infrared stars was carried out. The radiation error of the target measured by this method is 4.65%, which is better than the classic method＇s 14.57%. The result shows that the proposed method can provide an effective way for acquisition of infrared radiation characteristics of spatial target.