TITLE: Measurements of radio wave scattering from simple geometric shapes
SPEARKER: Sam Wei , Retired Research Scientist, Boeing Company, Seattle, WA.
Contact: Phone: (425) 392-0175. Email: amypaxwei@yahoo.com
DATE: May 20, 2011, 2:30PM
PLACE: ME 259
ABSTRACT: In the RCS (radar cross section) measurements of aerospace targets, simple geometric shapes have been used to characterize the range and to calibrate the results. For an insight, we review the scattering matrix representation with respect to the object shapes. At the Boeing 9-77 indoor compact range in Seattle, we have studied full-polarimetric data from VHF to 18 GHz on various test objects such as metallic spheres, cylinders, dihedrals, and flat plates. Expressions of RCS for thin objects (ka < 0.1) have been derived from theory and applied to the measurements from piano wires, as well as dielectric fishing lines. Uncertainty analyses on both co-polarized and cross-polarized channels have been made. Some interesting example of interference phenomena will be discussed. [1]
Bio: He received his BS degree from the National Taiwan University in 1960, his MS degree from the University of Illinois in 1963 and his PhD degree in chemical physics from the California Institute of Technology in 1968. After two years at Bell Telephone Labs, he joined Boeing in 1969 where he has performed research in low energy electron diffraction, spectroscopy on laser-produced plasmas and electrical discharges, and polarimetric radar target signature analysis. Wei has been involved with RCS measurements since 1991.
