NDLI: GNSS-R altimeter based on delay-Doppler Maps

Content Provider	IEEE Xplore Digital Library
Author	D'Addio, S. Martin-Neira, M. Di Bisceglie, M. Galdi, C. Martin, F.
Copyright Year	2015
Description	Author affiliation: Remote Sensing Lab., Univ. Politec. de Catalunya & IEEC/UPC, Barcelona, Spain (Martin, F.) \|\| Earth Obs. Programmes & Tech. Directorate, Eur. Space Agency, Noordwijk, Netherlands (D'Addio, S.; Martin-Neira, M.) \|\| Dipt. di Ing., Univ. degli Studi del Sannio, Benevento, Italy (Di Bisceglie, M.; Galdi, C.)
Abstract	The GNSS-R concept is a well-known spaceborne remote sensing technique that, by exploiting GNSS signals reflected from the earth, allows performing simultaneous observations of the Earth on several points over a very wide swath, very promising for applications such as mesoscale altimetry. However, for a single observation on earth, due to the intrinsic low power transmitted by the GNSS satellites, this technique provides reduced performance when compared to conventional spaceborne radars. In order to overcome this limitation, an innovative processing and retracking concept for GNSS-R altimeters based on the acquisition of the full delay-Doppler Map has been recently proposed by the authors. This differs with respect to the conventional GNSS-R processing technique, which exploits only the zero-Doppler power waveform of the DDM. The proposed processing adapts the SAR delay-Doppler concept of spaceborne radar altimeters for use in a GNSS-R system. This processing yields additional multi-look with respect to conventional GNSS-R concepts, and translates into an improvement of the altimetry performance estimated to be up to 35% for practical cases with low SNR. The present paper, after a brief introduction of the delay-Doppler altimetry processing, focuses on the performance analysis of this technique when applied to the for the reference case of the proposed GNSS-R GEROS-ISS experiment to be embarked on the International Space Station.
Starting Page	5103
Ending Page	5106
File Size	314932
Page Count	4
File Format	PDF
e-ISBN	9781479979295
DOI	10.1109/IGARSS.2015.7326981
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-26
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Doppler effect Altimetry Oceans Signal to noise ratio Global Positioning System Spaceborne radar Earth GNSS Reflectometry Ocean altimetry
Content Type	Text
Resource Type	Article

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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
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