This paper focuses on the optimization of the image quality for the ENVISAT ASAR ScanSAR modes. The best trade-off between Noise Equivalent σ0 (NEσ0) and Equivalent Number of Looks (ENL) is achieved by optimizing the 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 (focusing by SAR matched reference and scalloping compensation by inverse antenna weighting) introduce a space-variant distortion in the focused impulse response (FIRF). The focusing technique here proposed exploits a set of space-variant focusing kernels computed by means of Wiener deconvolution. In this way focusing and descalloping are obtained at one time, achieving a finer resolution and lower distortion of impulse response.
Optimizing performances of the ENVISAT ASAR ScanSAR modes / A. M., Guarnieri; Y. L., Desnos; Guccione, Pietro. - (2000). (Intervento presentato al convegno Progress in Electromagnetic Researh Symposium, PIERS 2000 tenutosi a Cambridge, MA nel July 5-14, 2000).
Optimizing performances of the ENVISAT ASAR ScanSAR modes
GUCCIONE, Pietro
2000
Abstract
This paper focuses on the optimization of the image quality for the ENVISAT ASAR ScanSAR modes. The best trade-off between Noise Equivalent σ0 (NEσ0) and Equivalent Number of Looks (ENL) is achieved by optimizing the 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 (focusing by SAR matched reference and scalloping compensation by inverse antenna weighting) introduce a space-variant distortion in the focused impulse response (FIRF). The focusing technique here proposed exploits a set of space-variant focusing kernels computed by means of Wiener deconvolution. In this way focusing and descalloping are obtained at one time, achieving a finer resolution and lower distortion of impulse response.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.