Empirical observations from analysis of coherency matrices of 4-look SIR-C data

Jorge V. Geaga

doi:10.1117/12.2514880

3 May 2019 Empirical observations from analysis of coherency matrices of 4-look SIR-C data

Jorge V. Geaga

Proceedings Volume 11003, Radar Sensor Technology XXIII; 110030I (2019) https://doi.org/10.1117/12.2514880
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

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.

Conference Presentation

Citation Download Citation

Jorge V. Geaga "Empirical observations from analysis of coherency matrices of 4-look SIR-C data", Proc. SPIE 11003, Radar Sensor Technology XXIII, 110030I (3 May 2019); https://doi.org/10.1117/12.2514880

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