FOUR-COMPONENT DECOMPOSITION WITH JOINT ANGLE COMPENSATION FOR ELLIPTICITY ANGLE AND ORIENTATION ANGLE

摘要

An improved four-component decomposition is proposedrnto solve the volume scattering overestimationrnproblem based on the Joint Angle Compensation (JAC)rnfor the ellipticity angle and orientation angle for polarimetricrnsynthetic aperture radar (POLSAR) data. Thernvolume scattering component is overestimated in differentrndegrees in the four-component decomposition. ThernJAC, together with Ellipticity Angle Compensationrn(EAC), is first introduced and applied to POLSAR datarnin the proposed decomposition, which increases thernnumber of elements of the coherency matrix used in therndecomposition to eight and relieves the problem of volumernscattering overestimation. The effectiveness of thernproposed decomposition is validated using Radarsat-2rnfull polarimetric data collected over Suzhou City, China.rnThe experimental results demonstrate that the proposedrndecomposition can correctly interpret the mechanismsrnof built-up areas and drastically decrease the number ofrnnegative power pixels.