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1 results

  • An Effective Method for Modeling Two-dimensional Sky Background of LAMOST

  • Hasitieer Haerken, Fuqing Duan, Jiannan Zhang, Ping Guo
  • Journal:
    Proceedings of the International Astronomical Union / Volume 12 / Issue S325 / October 2016
    Published online by Cambridge University Press:
    30 May 2017, pp. 63-66
    Print publication:
    October 2016
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  • Each CCD of LAMOST accommodates 250 spectra, while about 40 are used to observe sky background during real observations. How to estimate the unknown sky background information hidden in the observed 210 celestial spectra by using the known 40 sky spectra is the problem we solve. In order to model the sky background, usually a pre-observation is performed with all fibers observing sky background. We use the observed 250 skylight spectra as training data, where those observed by the 40 fibers are considered as a base vector set. The Locality-constrained Linear Coding (LLC) technique is utilized to represent the skylight spectra observed by the 210 fibers with the base vector set. We also segment each spectrum into small parts, and establish the local sky background model for each part. Experimental results validate the proposed method, and show the local model is better than the global model.