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Presenter: Prof. Jeffrey Krolik - Department of Electrical and Computer Engg., Duke University, Durham, NC 27708 USA
Supervisor:

Date: Fri, June 29, 2001
Time: 10:00:00 - 11:00:00
Place: EOW 430

ABSTRACT

Abstract

This talk addresses the problem of estimating range-varying parameters of the height-dependent index of refraction over the sea surface in order to predict ducted microwave propagation loss. Refractivity estimation is performed using a Markov model for microwave radar clutter returns from the sea surface. Specifically, the parabolic approximation for numerical solution of the wave equation is used to formulate the problem within a non-linear recursive Bayesian state estimation framework. Solution for the maximum a posteriori (MAP) estimate of the range-varying refractivity parameters, given log-amplitude clutter versus range data, is achieved using a particle filtering technique based on the forward algorithm for state estimation. Simulation and real data results based on experiments performed off Wallops Island, Virginia are presented which compare 3 Ghz. propagation loss estimates over range and height derived from radar clutter versus those predicted using helicopter-borne instruments.

FREE AND OPEN TO THE PUBLIC
For Further Information Contact:
Dr. R. Lynn Kirlin (721 8681)