NDLI: GPS ocean altimetry from aircraft using the P(Y) code signal

Content Provider	IEEE Xplore Digital Library
Author	Wilmhoff, B. Lalezari, F. Zavorotny, V. Walsh, E.
Copyright Year	2007
Description	Author affiliation: FIRST RF Corp., Boulder (Wilmhoff, B.; Lalezari, F.)
Abstract	A bistatic global positioning system (GPS) altimeter has been tested onboard a NOAA WP-3D research aircraft. The first altimetric data were obtained with this equipment above the sea surface to study the accuracy of such measurements using the P(Y)-encrypted GPS signal. The flight was conducted in the northeast Gulf of Mexico in September 2006 at about 1500 m altitude over a 150-by-150 km area under quiescent sea-state conditions. The ocean waves were a low, short swell of about 20 cm significant wave height (SWH) and 20 m dominant wavelength, providing minimal effect of sea-surface roughness. The data obtained over approximately a three-hour period consist of direct and reflected waveforms and the time delays between them. Smoothing of the raw waveforms was used to better identify the leading edge and the maximum of the reflected signal. Comparison of GPS-derived altitudes and altitudes obtained by the aircraft altimeter showed that the former followed most of the aircraft's altitude variations. The rms of the difference in height between the smoothed aircraft altimeter data and the GPS height determination based on a 0.4-s - averaged sea-surface - reflected waveform was on the order of 1 m. Additional averaging over 1 min reduced the rms to about 20 cm.
Starting Page	5093
Ending Page	5096
File Size	482814
Page Count	4
File Format	PDF
ISBN	9781424412112
DOI	10.1109/IGARSS.2007.4424007
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-23
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Global Positioning System Altimetry Aircraft System testing Sea surface Sea measurements Ocean waves Delay effects Smoothing methods Signal processing
Content Type	Text
Resource Type	Article

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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