NDLI: The EnviSat RA-2 Instrument Design and Tracking Performance

Content Provider	IEEE Xplore Digital Library
Author	Roca, M. Laxon, S. Zelli, C.
Copyright Year	1980
Abstract	The EnviSat satellite embarks an innovative radar altimeter, the RA-2 which represents a new generation of radar altimeters compared to previous instruments such as the European Remote Sensing Satellite (ERS) altimeters and The Ocean Topography Experiment/Poseidon. This is due to its integration of many new features. In particular, the RA-2 is the first satellite altimeter to incorporate autonomous resolution selection and a model-free tracker. The behavior of the instrument in orbit is controlled by onboard algorithms which determine the instrument logic, and a list of onboard parameters which control when switches in resolution occur. This logic and the choice of these parameters have a strong influence on the tracking performance. This paper describes the operation of the RA-2 onboard tracker and the resolution selection logic. We provide a detailed description of the algorithm and its configuration parameters after optimization during the EnviSat Commissioning Phase. Finally, we show the tracking performance, in particular compared to the ones of the ERS-2 altimeter, over different types of surfaces.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	3489
Ending Page	3506
Page Count	18
File Size	1829124
File Format	PDF
ISSN	01962892
Volume Number	47
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Instruments Radar tracking Satellites Logic Radar remote sensing Spaceborne radar Remote sensing Oceans Surfaces Switches tracking performance Altimetry onboard tracker radar altimeter RA-2
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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