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Letter

Numerical Focusing of a Wide-Field-Angle Earth Radiation Budget Imager Using an Artificial Neural Network

1
Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, USA
2
Department of Mechatronics Engineering, Kennesaw State University, Kennesaw, GA 30144, USA
3
Climate Science Branch, NASA Langley Research Center, Hampton, VA 23666, USA
*
Author to whom correspondence should be addressed.
Received: 8 December 2019 / Revised: 27 December 2019 / Accepted: 29 December 2019 / Published: 3 January 2020
(This article belongs to the Special Issue Correction of Remotely Sensed Imagery)
Narrow field-of-view scanning thermistor bolometer radiometers have traditionally been used to monitor the earth’s radiant energy budget from low earth orbit (LEO). Such instruments use a combination of cross-path scanning and along-path spacecraft motion to obtain a patchwork of punctual observations which are ultimately assembled into a mosaic. Monitoring has also been achieved using non-scanning instruments operating in a push-broom mode in LOE and imagers operating in geostationary orbit. The current contribution considers a fourth possibility, that of an imager operating in LEO. The system under consideration consists of a Ritchey-Chrétien telescope illuminating a plane two-dimensional microbolometer array. At large field angles, the focal length of the candidate instrument is field-angle dependent, resulting in a blurred image in the readout plane. Presented is a full-field focusing algorithm based on an artificial neural network (ANN). Absorbed power distributions on the microbolometer array produced by discretized scenes are obtained using a high-fidelity Monte Carlo ray-trace (MCRT) model of the imager. The resulting readout array/scene pairs are then used to train an ANN. We demonstrate that a properly trained ANN can be used to convert the readout power distribution into an accurate image of the corresponding discretized scene. This opens the possibility of using an ANN based on a high-fidelity imager model for numerical focusing of an actual imager. View Full-Text
Keywords: earth radiation budget monitoring; numerical focusing; image deblurring; artificial neural networks earth radiation budget monitoring; numerical focusing; image deblurring; artificial neural networks
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MDPI and ACS Style

Yarahmadi, M.; Mahan, J.R.; McFall, K.; Ashraf, A.B. Numerical Focusing of a Wide-Field-Angle Earth Radiation Budget Imager Using an Artificial Neural Network. Remote Sens. 2020, 12, 176. https://0-doi-org.brum.beds.ac.uk/10.3390/rs12010176

AMA Style

Yarahmadi M, Mahan JR, McFall K, Ashraf AB. Numerical Focusing of a Wide-Field-Angle Earth Radiation Budget Imager Using an Artificial Neural Network. Remote Sensing. 2020; 12(1):176. https://0-doi-org.brum.beds.ac.uk/10.3390/rs12010176

Chicago/Turabian Style

Yarahmadi, Mehran, J. R. Mahan, Kevin McFall, and Anum B. Ashraf 2020. "Numerical Focusing of a Wide-Field-Angle Earth Radiation Budget Imager Using an Artificial Neural Network" Remote Sensing 12, no. 1: 176. https://0-doi-org.brum.beds.ac.uk/10.3390/rs12010176

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