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Proceedings Paper

Empirical observations from analysis of coherency matrices of 4-look SIR-C data
Author(s): Jorge V. Geaga
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Paper Abstract

A large number of scatterers contribute to the total energy received from a resolution cell of a polarimetric synthetic aperture radar(POLSAR). The polarimetric response for each resolution cell is obtained by simultaneously measuring both the amplitude and phase of the scattered field using orthogonal channels. The POLSAR signature from ocean backscatter is primarily produced by the capillary and small gravity waves produced by the local wind. Measurement of low entropy cells from resonant ocean Bragg scatter requires proper multilook processing of the SAR phase histories. Low entropy information is not accessible using the standard averaging of pixels. Scattering entropy allows for the consideration of depolarization. Empirical observations are presented from four-look SIR-C L and C band data from a large set of global ocean surface data. The data trend of alpha versus incidence angle for the L Band four-look SIR-C scenes closely follows some behaviour predicted by an extended Bragg model. A survey is presented for a collection of terrestrial surfaces including agricultural areas, forests, desert terrain, and volcanic surfaces. Analysis of the normalized coherence matrices from four look SIR-C imagery is discussed.

Paper Details

Date Published: 3 May 2019
PDF: 15 pages
Proc. SPIE 11003, Radar Sensor Technology XXIII, 110030I (3 May 2019); doi: 10.1117/12.2514880
Show Author Affiliations
Jorge V. Geaga, Consultant (United States)

Published in SPIE Proceedings Vol. 11003:
Radar Sensor Technology XXIII
Kenneth I. Ranney; Armin Doerry, Editor(s)

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