Abstract
Recently, there has been growing interest in dual-pol systems that transmit one polarization and receive two polarizations. Souyris et al. proposed a DP mode called compact polarimetry (CP) which is able to reduce the complexity, cost, mass, and data rate of a SAR system while attempting to maintain many capabilities of a fully polarimetric system. This paper provides a comparison of the information content of full quad-pol data and the pseudo quad-pol data derived from compact polarimetric SAR modes. A pseudo-covariance matrix can be reconstructed following Souyris’s approach and is shown to be similar to the full polarimetric (FP) covariance matrix. Both the polarimetric signatures based on the kennaugh matrix and the Freeman and Durden decomposition in the context of this compact polarimetry mode are explored. The Freeman and Durden decomposition is used in our study because of its direct relationship to the reflection symmetry. We illustrate our results by using the polarimetric SAR images of Algiers city in Algeria acquired by the RadarSAT2 in C-band.
Highlights
The polarimetric radar synthetic aperture radar (PolSAR) images are formed by radar echoes of various combinations of transmitting and receiving polarizations from scattering media [1]
A pseudocovariance matrix can be reconstructed following Souyris’s approach and is shown to be similar to the full polarimetric (FP) covariance matrix. Both the polarimetric signatures based on the kennaugh matrix and the Freeman and Durden decomposition in the context of this compact polarimetry mode are explored
The construction of the pseudo quad-pol covariance matrices from the compact polarimetry modes is based on a pair of equations that are iteratively solved for 〈| | 〉 [6]
Summary
The polarimetric radar synthetic aperture radar (PolSAR) images are formed by radar echoes of various combinations of transmitting and receiving polarizations from scattering media [1]. Dual-mode partially polarimetric SAR systems (DP) have been proposed such us Envisat ASAR, the Japanese L-band PalSAR, the European X-band TerraSARX, and the Canadian C-band RadarSAT 2, where one polarization (H or V) is transmitted, whereas two are received. These DPmodes collect only half of the full scattering matrix, either (HH, VH) or (VV, HV). Other system configurations have been proposed and called compact polarimetry [6,7] In these polarimetric configurations, only one transmit/receive cycle is required instead of two in a quad-pol system, reducing the pulse repetition frequency and data rates by a factor of two for a given swath width. We illustrate our results by using the polarimetric SAR images of Algiers city in Algeria acquired by the RadarSAT2 in C-band
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