基于红外标准星和内部黑体标定源的联合辐射定标法可提高空间目标的红外辐射测量精度。黑体标定源位于红外辐射测量系统内部,用于定标光学系统响应率。依据大气消光模型,采用天文孔径测光法,通过观测不同仰角处的多颗具有较高光谱分辨率的红外标准星得到大气消光和系统透过率系数。700 mm口径地基中波红外辐射测量系统验证性实验的结果表明,在恒星图像曝光充分的情况下,联合辐射定标法的恒星辐照度反演误差优于11%。联合辐射定标法操作简单、成本低,可随时对测量设备进行现场标校。

Combined radiation calibration method based on infrared calibration stars and internal blackbody calibration source can improve the accuracy of infrared radiation measurement of spatial object. The blackbody calibration source is located inside the infrared radiation measurement system, which is used to calibrate the responsivity of the optical system. According to the atmospheric extinction model, using astronomical aperture metering method, the atmospheric extinction and system transmittance coefficient are obtained by observing multiple infrared calibration stars with higher spectral resolution at different elevation angles. The experimental results of the verification test of 700 mm aperture ground-based medium wave infrared radiation measurement system show that, in the case of sufficient exposure of star image, the inversion error of the star irradiance of the combined radiation calibration method is better than 11%. The combined radiation calibration method is simple and low cost, which can be used to calibrate the measurement equipment on-site at any time.