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Refraction Angle Calculation in Multilayered Ice for Wide-Beam Airborne Radar

Arenas-Pingarron, A; Brennan, P; Core, H; (2018) Refraction Angle Calculation in Multilayered Ice for Wide-Beam Airborne Radar. In: Proceedings of IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium. (pp. pp. 4146-4149). IEEE: Valencia, Spain. Green open access

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Abstract

We propose an algorithm to calculate the refraction path travelled by a signal from a source to a remote scatterer, through a horizontally parallel multilayer medium with vertical-varying refractive index. The exact solution in a simple two-layered medium requires solving a degree-4 polynomial according to Snell's law, meaning a time-demanding solution. For narrow-beam sources a small-angle approximation is commonly used. In this new technique, we transformed the governing equations until the system can be solved by intersection of two curves. As these are monotonic with opposite slope, the crossing point can be estimated by iteration, with a minimum search algorithm. This method has been applied to focus synthetic aperture radar images of the Antarctic bedrock, improving the detected response in the wide-beam case, and reducing time regarding to compute the polynomial solution.

Type: Proceedings paper
Title: Refraction Angle Calculation in Multilayered Ice for Wide-Beam Airborne Radar
Event: IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium
Location: Valencia, Spain
Dates: 22 July 2018 - 26 July 2018
ISBN-13: 978-1-5386-7150-4
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/IGARSS.2018.8518277
Publisher version: https://doi.org/10.1109/IGARSS.2018.8518277
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Back-projection, radar, refraction, SAR, Snell’s law
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/10050052
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