一种改进的用于星空背景红外辐射建模的光谱模板技术  

Improved spectral template technique for IR radiation modeling of celestial background

作　　者：洪耀辉[1] 许小剑[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《红外与激光工程》2011年第7期1214-1220,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(61074184);航空基金(20090151006)

摘　　要：光谱模板技术可以生成任意恒星的光谱,解决了许多恒星缺少光谱观测数据的问题,在星空背景建模中具有重要作用。对传统的光谱模板技术予以改进。首先,提出了辐射计"框架"修正法,不仅修正了红外天文卫星ISO测得的中等分辨率光谱SWS的非线性失真,而且改善了Engelke幂函数修正法存在的工作量大和人为误差问题。其次,基于修正后的SWS光谱,并结合恒星大气模型数据库ATLAS9,建立了一套归一化光谱模板库。最后,通过将指定恒星所属的光谱模板与该恒星的Engelke连续谱函数相乘实现了任意恒星红外光谱的生成。实例验证表明,改进的光谱模板技术不仅提高了所生成恒星光谱的分辨率,而且大大减小了光谱与高质量辐射计的偏差。Spectral template technique is able to generate spetra of arbitrary star, which resolves the problem that many stars missing spectroscopic observation data, and plays an importrant role in celestial background model. In this paper, the traditional spectral template technique was improved. Firstly, a photometric ＂frame＂ correction method was proposed. In this way, the nonlinear distortion in SWS spectra derived from infrared astronomy satellite ISO was corrected, and the high workload and artifical error problems in Engelke＇s power function correction method were resolved. Secondly, based on the corrected SWS spectra and stellar atmosphere model database ATLAS9, a normalized spectral template library was established. Finally, the infrared spectra for arbitrary stellar can be generated by multiplying its Engelke continuum function and the spectral template which the star was categorized as. Examples show that, the resolution of the generated stellar spectra is enhanced, and the deviation between the spectra and the high quality photometry is greatly reduced by using the improved spectral template technique.

关 键 词：光谱模板技术 星空背景 红外辐射 

分 类 号：TN219[电子电信—物理电子学] TB15[天文地球—天文学]