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NCJRS Celebrates National Library Week April 12-18

National Library Week

Started in 1958, National Library Week is a nationwide observance celebrated by all types of libraries - including the NCJRS Virtual Library. NCJRS invites you to explore the breadth and scope of the NCJRS Virtual Library collection and services. With more than 220,000 collection documents and 60,000 online resources, including all known Office of Justice Programs works, it is one of the world’s largest criminal justice special collections.

We encourage your Feedback. Tell us how you use the NCJRS Virtual Library and Abstracts Database, how you access the collection, and any ways we can improve our services.

NCJRS Abstract

The document referenced below is part of the NCJRS Library collection.
To conduct further searches of the collection, visit the NCJRS Abstracts Database.

How to Obtain Documents
NCJ Number: NCJ 189918     Find in a Library
Title: Portable Concealed Weapon Detection Using Millimeter Wave FMCW Radar Imaging
  Document URL: PDF 
Author(s): Yu-Wen Chang ; Michael Johnson
Corporate Author: CHANG Industry Inc
United States of America
Date Published: 08/2001
Page Count: 27
  Annotation: This report describes the development and performance of a fast image scanning 94GHz radar system that is suitable for portable operation and remote viewing of radar data for the unobtrusive detection of concealed weapons on persons or in abandoned bags.
Abstract: This system includes a novel fast image-scanning antenna that allows for the acquisition of medium resolution three dimensional millimeter wave images of stationary targets with frame times on the order of 1 second. The three-dimensional radar data allow for potential isolation of concealed weapons from body and environmental clutter such as nearby furniture or other people. The radar is an active system different from the millimeter wave passive imaging system that depends on millimeter wave emission/reflection contrast between the weapon and the body/clothing; therefore, the radar returned image data are the same whether indoors or outdoors. The 94 GHz radar-emitted power of approximately 1mW is low and poses no health concerns for operator or targets. The low power operation is still sufficient to penetrate heavy clothing or material. Small system size allows for easy transport and rapid deployment of the system as well as an easy migration path to future hand-held systems with a special image scan technique. A much faster scanning antenna and data acquisition system is deemed feasible for hand-held concealed weapon detection as a result of this research. 15 figures, 1 table, and 1 references
Main Term(s): Science and Technology
Index Term(s): Metal detection ; Metal detection devices ; Concealed weapons detection ; NIJ final report
Sponsoring Agency: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America
Grant Number: 1998-DT-CX-K001
Sale Source: National Institute of Justice/NCJRS
Box 6000
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Type: Program/Project Description
Country: United States of America
Language: English
Note: Dataset may be archived by the NIJ Data Resources Program at the National Archive of Criminal Justice Data
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