This paper focuses on the optimization of the image quality for the ENVISAT ASAR ScanSAR modes. The best tradeoff between Noise Equivalent 0 (NE0) and Equivalent Number of Looks (ENL) is achieved by optimizing both system and processing parameters within the instrument constraints. An end-to-end model to validate the study has been used. Thereafter a novel phase preserving focusing technique is presented. Conventional approaches (that exploit the SAR matched filter) introduce a space-variant distortion when focusing very low resolution ScanSAR data. The focusing technique here proposed uses a set of space-variant focusing kernels properly computed by means of Wiener pseudoinversion. In this way focusing is achieved with no distortion, thus getting the finer resolution and the lower sidelobes.
ASAR ScanSAR modes:quality enhancement
CAFFORIO, CIRO;MONTI-GUARNIERI, ANDREA VIRGILIO
2000-01-01
Abstract
This paper focuses on the optimization of the image quality for the ENVISAT ASAR ScanSAR modes. The best tradeoff between Noise Equivalent 0 (NE0) and Equivalent Number of Looks (ENL) is achieved by optimizing both system and processing parameters within the instrument constraints. An end-to-end model to validate the study has been used. Thereafter a novel phase preserving focusing technique is presented. Conventional approaches (that exploit the SAR matched filter) introduce a space-variant distortion when focusing very low resolution ScanSAR data. The focusing technique here proposed uses a set of space-variant focusing kernels properly computed by means of Wiener pseudoinversion. In this way focusing is achieved with no distortion, thus getting the finer resolution and the lower sidelobes.File | Dimensione | Formato | |
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