Turbulence variability in hyper-spectral imagery

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Authors
  1. Potvin, G.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN)
Abstract
Hyper-Spectral Imaging (HSI) is subject to adverse atmospheric effects such as aerosols, gas mixtures and turbulence. Although aerosol and gas mixture effects on HSI performance have been studied, little is known about optical turbulence effects on HSI spectral variability. This has now been investigated by propagating coherent beams at various central wavelengths and spectral bandwidths in the aero-ballistic range at the DRDC – Valcartier Research Centre, and propagating them through artificially generated optical turbulence. Image sequences of the beam were recorded with a panchromatic camera, and the turbulent variance of the total irradiance of the beams as a function of central wavelength and bandwidth were estimated. A simple model for the spectral covariance induced by turbulence was developed that compares reasonably well with the measured variances at various central wavelengths and bandwidths. This result gives some confidence in our model, which predicts potentially significant loss of correlation for Visible and Near Infra-Red (VNIR) and Short Wave Infra-Red (SWIR) spectra. It is concluded that turbulence effects could have a significant impact on HSI target identification and that further study is required.

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Keywords
Hyper-Spectral Imaging;turbulence;spectral covariance
Report Number
DRDC-RDDC-2018-R257 — Scientific Report
Date of publication
01 Nov 2018
Number of Pages
22
DSTKIM No
CA047938
CANDIS No
808430
Format(s):
Electronic Document(PDF)

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