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  • 1
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    C-band measurement of radar backscatter from the ocean surface during SWADE (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A preliminary analysis of backscatter measurements collected during the joint NASA/ONR Surface Wave Dynamics Experiment (SWADE) by a C-band scatterometer (C-SCAT) is presented. Data were collected during a total of ten flights on board the NASA/Ames C-130B off the coast of Virginia. These backscatter measurements are vertically polarized, and were obtained over a full 360* in azimuth, at incidence angles ranging from 20 to 50 . The data set is now in a state where it can provide a unique test bed for normalized radar cross section (NRCS) model functions because of the variety of phenomena encountered, and the quantity and quality of the measurements.
    Keywords: OCEANOGRAPHY
    Type: In: IGARSS '92; Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, May 26-29, 1992. Vol. 1 (A93-47551 20-43); p. 693-695.
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  • 2
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    Wide swath ocean topography mapping with interferometric altimeters (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An interferometric radar altimeter is proposed to provide wide-swath high-resolution ocean topography. Several system design issues of such an interferometric altimeter are presented. Tradeoffs between processing of the interferometric signal using the so-called amplitude approach and the so-called phase approach are shown. The systematic errors associated with uncertainties in the interferometer baseline and the attitude of interferometer orientation are also discussed. Described is an approach using the measurements at orbit cross-over regions, together with the topography measurements from a traditional nadir-looking altimeter that are not contaminated by the baseline and attitude noises. Preliminary simulation results show that such an approach can generate an acceptable error level if the ocean surface does not change appreciably between the observations.
    Keywords: OCEANOGRAPHY
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  • 3
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    Studies of the location of azimuth modulation minima for Ku band ocean radar backscatter (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An extensive data set of radar backscatter measurements at 14 GHz was used to evaluate the locations of the azimuthal modulation minima relative to the cross-wind directions. It was found that the minima were significantly offset from the cross-wind directions toward the downwind direction for the horizontal polarization data. These offsets were substantially smaller for the vertical polarization data. Simple scattering model calculations, based on the two-scale scattering approach, also show similar offsets. Implications of these results for the goephysical model function are discussed.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 8229-823
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  • 4
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    Remote sensing of ocean waves: The Surface Wave Process Program experiment (1994)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: An airborne synthetic aperture radar (SAR) has been used as an interferometer to obtain direct, calibrated measurements of the ocean wind wave directional spectrum. Flights over the same area from three different directions produced reasonably consistent results. The SAR-derived wave data agree well with simultaneous observations by a conventional wave measuring system and with a novel in situ acoustic Doppler system.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0418-0227); 99; C4; p. 7945-7950
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  • 5
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    Ocean radar backscatter relationship with near-surface winds - A case study during Fasinex (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A case study of the ocean radar backscatter dependence on near-surface wind and wind stress is presented using the data obtained on February 18, 1986 during the Frontal Air-Sea Interaction Experiment. The particular wind-wave conditions and their variations across a sharp sea surface temperature front are described. The small change in wind speed across the front cannot account for the large change in wind stress implying significant changes in the drag coefficient and surface roughness length. The results strengthen the hypothesis that radar backscatter is closely correlated to wind stress, and therefore, could be used for remote sensing of the wind stress itself over the global oceans.
    Keywords: OCEANOGRAPHY
    Type: Journal of Physical Oceanography (ISSN 0022-3670); 19; 342-353
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