Title :
Phase calibration of polarimetric radars from slightly rough surfaces
Author :
Guissard, Albert
Author_Institution :
Dept. of Electr. Eng., Univ. Catholique de Louvain, Belgium
fDate :
5/1/1994 12:00:00 AM
Abstract :
The phase calibration problem for polarimetric radars is discussed. More specifically, the assumption that the copolar vertical and horizontal returns from a slightly rough surface are in phase is critically reviewed. It is concluded by means of a theoretical analysis that the phase difference for moist soil targets can reach up to 10° at 15 GHz and for incidence angles of 50°. However the assumption of zero phase difference is a good approximation for dry soils, lower frequencies, and low incidence angles
Keywords :
calibration; geophysical techniques; polarimetry; remote sensing; remote sensing by radar; synthetic aperture radar; SAR; copolar vertical; dry soil; geophysical measurement technique; horizontal return; land surface radar remote sensing; moist soil; phase calibration; phase difference; polarimetric radar; polarimetry; slightly rough surface; terrain mapping; Airborne radar; Calibration; Polarization; Propulsion; Radar polarimetry; Radar scattering; Rough surfaces; Soil; Surface roughness; Symmetric matrices;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
