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A new system model for radar polarimeters

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1 Author(s)
Freeman, A. ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA

The validity of the 2×2 receive R and transmit T model for radar polarimeter systems, first proposed by H. Zebker et al. (1987), is questioned. The model is found to be invalid for many practical realizations of radar polarimeters, which can lead to significant errors in the calibration of polarimetric radar images. A more general model is put forward, which addresses the system defects which cause the 2×2 model to break down. By measuring one simple parameter from a polarimetric active radar calibration (PARC), it is possible to transform the scattering matrix measurements made by a radar polarimeter to a format compatible with a 2×2 R and T matrix model. Alternatively, the PARC can be used to verify the validity of the 2×2 model for any polarimetric radar system. Recommendations for the use of PARCs in polarimetric calibration and to measure the orientation angle of the horizontal (H) and vertical (V) coordinate system are also presented

Published in:

Geoscience and Remote Sensing, IEEE Transactions on  (Volume:29 ,  Issue: 5 )

Date of Publication:

Sep 1991

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