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Zurich Open Repository andArchiveUniversity of ZurichMain LibraryStrickhofstrasse 39CH-8057 Zurichwww.zora.uzh.ch

Year: 2013

The Envisat ASAR mission: A look back at 10 years of operation

Miranda, Nuno <javascript:contributorCitation( ’Miranda, Nuno’ );>; Rosich, Betlem<javascript:contributorCitation( ’Rosich, Betlem’ );>; Meadows, Peter J

<javascript:contributorCitation( ’Meadows, Peter J’ );>; Haria, Kajal <javascript:contributorCitation(’Haria, Kajal’ );>; Small, David <javascript:contributorCitation( ’Small, David’ );>; Schubert, Adrian

<javascript:contributorCitation( ’Schubert, Adrian’ );>; Lavalle, Marco<javascript:contributorCitation( ’Lavalle, Marco’ );>; Collard, Fabrice <javascript:contributorCitation(

’Collard, Fabrice’ );>; Johnsen, Harald <javascript:contributorCitation( ’Johnsen, Harald’ );>;Monti-Guarnieri, Andrea <javascript:contributorCitation( ’Monti-Guarnieri, Andrea’ );>; D’Aria,

Davide <javascript:contributorCitation( ’D’Aria, Davide’ );>

Abstract: The Advanced Synthetic Aperture Radar (ASAR) on- board Envisat operated successfully forjust over 10 years until the failure of Envisat in April 2012. ASAR was ESA’s very first deploymentof a C-band phased- array antenna, allowing extended imaging capacity in comparison to its ERS SARpredecessors. As such it operated in various acquisition modes – Image (IM), Alternating Polarisation(AP), Wide Swath (WS), Global Monitoring (GM), and Wave (WV). For IM and AP modes there wasa selection of 7 swaths with swath width from 100 km to 56 km: IM was single-polarisation, whileAP was dual-pol, offering a choice from HHVV, HHHV, or VVVH. WS and GM modes had a totalswath width of 405 km based on the combination of 5 sub-swaths. WV acquired imagettes of 10 kmby 10 km every 100 km along the satellite track. This paper is a look back to the 10 years of ASARoperations, covering topics such as the ASAR Instrument (characteristics, acquisition modes, product treeand observation scenario), Instrument Calibration and Performance Verification (including instrumentstability, internal calibration, external calibration, absolute radiometric calibration, localisation accuracy,absolute geolocation accuracy, performance verification and product calibration), ASAR specific missions(wave and polarimetric), particular ASAR events such as antenna resets, burst synchronisation, AP swathmodifications and the Envisat orbit change in October 2010.

Posted at the Zurich Open Repository and Archive, University of ZurichZORA URL: https://doi.org/10.5167/uzh-96146Conference or Workshop ItemPublished Version

Originally published at:Miranda, Nuno; Rosich, Betlem; Meadows, Peter J; Haria, Kajal; Small, David; Schubert, Adrian; Lavalle,Marco; Collard, Fabrice; Johnsen, Harald; Monti-Guarnieri, Andrea; D’Aria, Davide (2013). The EnvisatASAR mission: A look back at 10 years of operation. In: ESA Living Planet Symposium, Edinburgh,Scotland, 9 September 2013 - 13 September 2013, 1-17.

THE ENVISAT ASAR MISSION: A LOOK BACK AT 10 YEARS OF OPERATION �

N. Miranda (1), B. Rosich (1), P.J. Meadows (2), K. Haria (3), D. Small (4), A. Schubert (4), M. Lavalle (5), F. Collard (6), H. Johnsen (7), A. Monti Guarnieri (8) & D. D'Aria (9)

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Proc. ‘ESA Living Planet Symposium 2013’, Edinburgh, UK

9–13 September 2013 (ESA SP-722, December 2013)

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