Extraction of Internal Spatial Features of Inhomogeneous Dielectric Objects Using Near-Field Reflection Data

Abstract

Abstract-Ultra-wideband (UWB) microwave radar imaging techniques provide a non-invasive means to extract information related to an object's internal structure. For these applications, a short-duration electromagnetic wave is transmitted into an object of interest and the backscattered fields that arise due to dielectric contrasts at interfaces are measured. In this paper, we present a method that may be used to estimate the time-of-arrival (T OA) parameter associated with each reflection that arises due to a dielectric property discontinuity (or dielectric interface). A second method uses this information to identify the locations of points on these interfaces. When data are collected at a number of sensor locations surrounding the object, the collection of points may be used to estimate the shape of contours that segregate and enclose dissimilar regions within the object. The algorithm is tested with data generated when a cylindrical wave is applied to a number of numerical 2D models of increasing complexity. Moreover, the algorithm's feasibility is evaluated using data generated from breast models constructed from magnetic resonance (MR) breast scans. Results show that this is a promising approach to identifying regions and the internal structure within the breast.

Investigation on Doppler Spectral Characteristics of Electromagnetic Backscattered Echoes From Dynamic Nonlinear Surfaces of Finite-Depth Sea

“…The Doppler spectrum of backscattered echoes provides much more valuable information than the mere radar backscattering cross section, thus the study of the Doppler spectral characteristics from dynamic oceanic surfaces has been receiving great attention for its myriad applications in research areas such as target detection [1][2][3][4][5][6][7], remote sensing in marine environment, etc. [8][9][10].…”

Integrating prior information into microwave tomography part 2: Impact of errors in prior information on microwave tomography image quality

“…Errors are inherent in the estimation procedure that is used to acquire the prior information. Namely, there are errors and uncertainty related to the internal structural information used to segment the interior into regions and the spatial mean dielectric properties that are estimated over these regions, as reported in Kurrant and Fear . Moreover, preliminary feasibility studies are being carried out with two measurements systems (one for the regional estimation algorithm and one for the detailed tomography).…”

Features Extraction of Rotationally Symmetric Ballistic Targets Based on Micro-Doppler

“…Micro-Doppler is regarded as a unique signature of an object with movements where the uniqueness means different micro-motions have dissimilar signatures. Micro-Doppler signatures might be extracted for radar target identification which is seen as a good method and a technique of great potential [6,7,[9][10][11][12][13][14][15][16][17]. Since the m-D phenomenon is presented and researched by Chen et al, the extractions of the m-D signatures have developed rapidly [8,[18][19][20][21][22].…”