Improved spectral template technique for IR radiation modeling of celestial background

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.