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Proceedings Paper

A new SNR model for space-borne hyperspectral imagers including atmospheric scattering influence
Author(s): Junwei Lang; Yueming Wang; Jianyu Wang
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Paper Abstract

Space-borne hyperspectral imagery is widely used in the fields of earth science and mineral detection. High signal-to-noise ratio (SNR) of imaging spectrometers is required to guarantee the image data validity. To describe the system sensitivity, previous SNR models mainly focused on the optical parameters and the detector characteristics. However, the sensitivity of space-borne hyperspectral imagers is also limited by the atmospheric scattering effect to a large extent. A quantified and complete SNR model including atmospheric scattering influence is valuable for the development of imaging spectrometers.

In this paper, scattering influence on hyperspectral imaging quality was analyzed in the spectral range of 0.4μm-2.5μm. Atmospheric simulation was presented and system performance reduction caused by the scattering effect was also quantified. The results show that the scattered light will occupy a large proportion of the system dynamic range and bring additional shot noise, which causes evident SNR attenuation.

Based on the analysis a new SNR model including atmospheric parameters was provided. Hyperspectral imaging quality was calculated with both the new SNR model and the classical SNR model respectively, and comparative study of the two models was given in this paper.

In order to validate the new SNR model, a hyperspectral imaging system and a multiband camera were built, and the imaging experiments were conducted. The results show that the atmospheric scattering effect could lead to significant SNR reduction and contrast attenuation of spectral images, especially at visible bands. Using the new SNR model could allow designers to estimate the system performance more precisely. Corresponding instrument design measures were also proposed based on the analysis and experiments.

Paper Details

Date Published: 30 August 2013
PDF: 10 pages
Proc. SPIE 8910, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Spectrometer Technologies and Applications, 89101I (30 August 2013); doi: 10.1117/12.2034537
Show Author Affiliations
Junwei Lang, Shanghai Institute of Technical Physics (China)
Univ. of Chinese Academy of Sciences (China)
Yueming Wang, Shanghai Institute of Technical Physics (China)
Jianyu Wang, Shanghai Institute of Technical Physics (China)

Published in SPIE Proceedings Vol. 8910:
International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Spectrometer Technologies and Applications
Lifu Zhang; Jianfeng Yang, Editor(s)

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