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Research on on-orbit spectral calibration method of hyperspectral infrared sensor

  • role： First author第一作者
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

    College of Optoelectronics, University of Chinese Academy of Science, Beijing 100049, China

  • Email：machenyang191@mails.ucas.ac.cn
  • Introduction：马晨阳，1998年生，男，硕士研究生，研究方向为热红外定量遥感。E-mail： machenyang191@mails.ucas.ac.cn
MA Chenyang12,  
  • role： Corresponding author通信作者
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

  • Email：qianyg@aircas.ac.cn
  • Introduction：钱永刚，1980年生，男，研究员，研究方向为中/热红外定量遥感及传感器定标。E-mail： qianyg@aircas.ac.cn
QIAN Yonggang1*,  
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

LI Kun1,  
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

WANG Ning1,  
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

MA Lingling1,  
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

QIU Shi1,  
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

GAO Caixia1,  
  • Affiliation：

    Key Laboratory of Quantitative Remote Sensing Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

LI Chuanrong1

Resümee

During the entire operating life of a spaceborne sensor, the sensor’s spectral capability would be affected by optical device displacement, mechanical vibration, space environmental rays, etc. As a means to determine the spectral performance parameters of infrared hyperspectral sensors, high precision on-orbit spectral calibration is an essential prerequisite for quantitative remote sensing retrieval and application. Therefore, a fast and efficient spectral calibration method for hyperspectral mid-infrared and thermal infrared sensors needs to be constructed.In this paper, we established a spectral calibration method to retrieve the array centroid and Full Width at Half Maximum (FWHM) simultaneously in the absence of surface measurements. The method is mainly based on the atmospheric absorption line’s characteristics of the on-orbit effective brightness temperature (without the influence of atmospheric upward radiance) and the atmospheric transmittance spectrum, meanwhile, the spectral performance parameters were calibrated using a cost function composed of multiple spectrum matching algorithms. Before spectrum matching, it is necessary to perform Normalized Optical Depth Derivative (NODD) and continuum removal on the spectrum data.The Atmospheric Infrared Sounder (AIRS) spectral calibration results shown that the calibration accuracy of centroid frequency is better than 0.0154 cm-1, besides, the shift of centroid and FWHM are within ±0.02 cm-1 and ±0.1 cm-1, respectively. In other words, the centroid frequency and FWHM fluctuate within the 0.2%—1.9% and 0.5%—12.0% mean value of an array declared FWHM.This study demonstrated the utility of this method which can determine the mid-infrared and thermal infrared array spectral status change with high accuracy and stability. At the same time, we analyzed the sensitivity of this calibration method to atmospheric upward radiance, surface type, and the number of sampling points. The results confirmed that the influence of surface types on calibration accuracy is tolerable. Moreover, when the upward atmospheric radiance is accurately eliminated and the number of spatial sampling points is greater than 20, the spectral calibration result is reliable.

Schlüsselwort

spectral calibration;centroid frequency;FWHM;spectral matching;stepwise refinement;AIRS

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