Millimeter-wave imaging concepts: Synthetic Aperture Radar (SAR) and Digital Beam Forming (DBF)

Abstract

Short range radar imaging systems for various security and non-destructive testing (NDT) applications are mainly based on synthetic aperture radar (SAR) or digital beam forming (DBF) techniques. In this article the development of a real-time SAR and a real-time DBF system is presented. The goal is to achieve a 3D image of a large measurement area with a high lateral and range resolution in order to detect suspicious items or material approach. This can be realized with a SAR system which is based on a new rotating virtual antenna concept. Another approach is a digital beam forming concept consisting of spatially distributed transmitters and receivers. Experimental results on specific test objects are presented to prove the performance of both concepts.

Three-Dimensional Microwave Imaging for Concealed Weapon Detection Using Range Stacking Technique

“…Recently, increasing terrors have been motivating the development of various concealed weapon detection techniques for better security monitoring at airports, courthouses, and other buildings [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The ability to detect dangerous hidden items is seen as a significant tool in defeating terrorism in today's environment.…”

A Study on Millimeter-Wave Imaging of Concealed Objects: Application Using Back-Projection Algorithm

“…With these abilities, MMW imaging has been used in a variety of applications including target surveillance and precision target imaging for military purposes [2]; safe aircraft landing [3], highway traffic monitoring in fog [4], remote sensing for civil applications [5] and concealed threat object detection for security concerns [6]. There are also some reported examples in the non-destructive testing field where the dielectric material defects are detected with the good penetration ability of MMW signals [7,8].…”