NDLI: Effects of spacecraft attitude on the NASA Scatterometer antenna calibration

Content Provider	IEEE Xplore Digital Library
Author	Zec, J. Linwood Jones, W.
Copyright Year	1998
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Central Florida, Orlando, FL, USA (Zec, J.)
Abstract	Radar scatterometers are expected to become a main source of marine surface winds. Wind vector retrieval is based on the relation (geophysical model function) between the radar cross-section and wind induced surface roughness. Multiple antennas, pointed at different azimuth angles, are required to remove wind direction ambiguity inherent in a single cross-section wind vector observation. Scatterometer antennas must be well calibrated to ensure desired accuracy of the retrieved wind. Pre-launch calibration alone proved insufficient in the past so post-launch calibration and validation is planned for scatterometer missions. During cal/val activities for the NASA Scatterometer (NSCAT), a consistent difference was noted between calibration corrections calculated based on ascending vs. descending passes. This difference cannot be attributed to geophysical parameters and must be instrument related. In this paper, an attempt is made to attribute ascending/descending discrepancy to imperfect spacecraft attitude. Calibration is performed at multiple spacecraft attitude sets (roll, pitch, and yaw). The set producing the lowest difference between ascending and descending based corrections is the suggested attitude. After brief introduction to the NSCAT in the next section, calibration method using homogenous land targets is outlined.
Starting Page	1998
Ending Page	2000
File Size	380053
Page Count	3
File Format	PDF
ISBN	0780344030
DOI	10.1109/IGARSS.1998.703720
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-07-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space vehicles NASA Radar measurements Spaceborne radar Calibration Radar cross section Rough surfaces Surface roughness Radar antennas Radar scattering
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
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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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Effects of spacecraft attitude on the NASA Scatterometer antenna calibration

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