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Record Details

Record 23 of 12464
Two-frequency /Delta k/ microwave scatterometer measurements of ocean wave spectra from an aircraft
Author and Affiliation:
Johnson, J. W.(NASA Langley Research Center, Hampton, VA, United States)
Jones, W. L.(NASA Langley Research Center, Hampton, VA, United States)
Weissman, D. E.(Hofstra University, Hempstead, N.Y., United States)
Abstract: A technique for remotely sensing the large-scale gravity wave spectrum on the ocean surface using a two frequency (Delta k) microwave scatterometer has been demonstrated from stationary platforms and proposed from moving platforms. This measurement takes advantage of Bragg type resonance matching between the electromagnetic wavelength at the difference frequency and the length of the large-scale surface waves. A prominent resonance appears in the cross product power spectral density (PSD) of the two backscattered signals. Ku-Band aircraft scatterometer measurements were conducted by NASA in the North Sea during the 1979 Maritime Remote Sensing (MARSEN) experiment. Typical examples of cross product PSD's computed from the MARSEN data are presented. They demonstrate strong resonances whose frequency and bandwidth agree with the surface characteristics and the theory. Directional modulation spectra of the surface reflectivity are compared to the gravity wave spectrum derived from surface truth measurements.
Publication Date: Jan 01, 1981
Document ID:
19820063958
(Acquired Nov 30, 1995)
Accession Number: 82A47493
Subject Category: OCEANOGRAPHY
Document Type: Conference Proceedings
Publication Information: (SEE A82-47491 24-48)
Publisher Information: United States
Meeting Information: Oceanography from space; May 26-30, 1980; Venice; Italy
Financial Sponsor: NASA; United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Hofstra Univ.; Hempstead, NY, United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: MICROWAVE SCATTERING; OCEAN DATA ACQUISITIONS SYSTEMS; OCEAN SURFACE; RADAR MEASUREMENT; REMOTE SENSING; WATER WAVES; AIRCRAFT INSTRUMENTS; GRAVITY WAVES; METEOROLOGICAL RESEARCH AIRCRAFT; MODULATION TRANSFER FUNCTION; SCATTEROMETERS; SIGNAL TO NOISE RATIOS
Imprint And Other Notes: In: Oceanography from space; Proceedings of the Symposium, Venice, Italy, May 26-30, 1980. (A82-47491 24-48) New York, Plenum Press, 1981, p. 607-616.
Availability Source: Other Sources
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