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

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 accor...

Full description

Saved in:
Bibliographic Details
Main Authors: Arenas-Pingarron, Alvaro, Brennan, Paul V., Corr, Hugh
Format: Conference Proceeding
Language:English
Subjects:
Airborne radar
Antarctica
Back-projection
Ice
Mathematical model
radar
refraction
Refractive index
SAR
Snell's law
Synthetic aperture radar
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2153-7003
DOI:10.1109/IGARSS.2018.8518277