Spaceborne radar measurement of wind velocity over the ocean - an overview of the NSCAT Scatterometer system

Article Abstract:

The US National Aeronautics and Space Administration (NASA) Scatterometer (NSCAT) is a microwave radar system able to measure near-surface vector winds over the oceans under all-weather conditions. NSCAT is expected to be launched aboard the National Space Development Agency of Japan's ADvanced Earth Observing Satellite (ADEOS) in early 1995. Such scatterometers transmit microwave pulses to the ocean surface and measure the backscattered power received at the instrument, using a highly indirect technique to measure wind velocity over the ocean since the atmospheric motions themselves have little effect on the radiation emitted and received by the radar. The NSCAT transmitter/receiver must sequence through all eight antenna beams in the system within 3.74 seconds to achieve a 25-kilometer along-track resolution, giving it a maximum dwell time of 468 microseconds within each of the eight antenna footprints.

Space research and technology, Systems analysis, Product introduction, Imaging systems, United States. National Aeronautics and Space Administration, Radar, Satellites (Astronomical bodies), Oceanography, Microwaves, Geophysics, System Design, Measurement, Satellites, Scientific Research, Instruments, Radar Systems, New Technique, Imaging Technology

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Overview of MM and UTD methods at the Ohio State University

Article Abstract:

The method of moments (MM) and the uniform geometrical theory of diffraction (UTD) are highly useful methods for low- and high-frequency numerical analysis of electromagnetic radiation scattered from complex shapes. The Ohio State University ElectroScience Laboratory has developed many practical computer code implementations of the MM and UTD techniques. Examples of MM applications to radar targets to objects in or near resonance including modeling of perfectly conducting arbitrary 3D surfaces, scattering by a generalized cylinder, and scattering from material-coated edges. UTD applications to near zone and far zone modeling of targets identified by radar in the microwave band include multiple flat plates and finite elliptic cylinders, both near zone, and multiple-sided flat plates, multiple-section cone frustums, and finite-composite section ellipsoids, all far zone.

Numerical analysis, The Ohio State University, Geometry, Electromagnetic radiation, Object Recognition, Aircraft, Quantitative Methods, Ohio State University

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