Near-field millimeter-wave imaging for weapon detection

Conference · Sun Nov 01 04:00:00 EST 1992

OSTI ID:7066736

Sheen, D M; McMakin, D L; Collins, H D; Hall, T E

Various millimeter-wave imaging systems capable of imaging through clothing for the detection of contraband metal, plastic, or ceramic weapons, have been developed at PNL. Two dimensional scanned holographic systems, developed at 35, 90, and 350 GHz, are used to obtain high resolution images of metal and plastic targets concealed by clothing. Coherent single-frequency amplitude and phase data, which is gathered over a two-dimensional scanned aperture, is reconstructed to the target plane using a holographic wavefront reconstruction technique. Practical weapon detection systems require high-speed scanning. To achieve this goal, a 35 GHz linear sequentially switched array has been built and integrated into a high speed linear scanner. This system poses special challenges on calibration / signal processing of the holographic system. Further, significant improvements in speed are required to achieve real time operation. Toward this goal, a wideband scanned system which allows for a two-dimensional image formation from a one-dimensional scanned (or array) system has been developed . Signal / image processing techniques developed and implemented for this technique are a variation on conventional synthetic aperture radar (SAR) techniques which eliminate far-field and narrow bandwidth requirements. Performance of this technique is demonstrated with imaging results obtained from a K[sub a]-band system.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: FAA; Federal Aviation Administration, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 7066736
• Report Number(s): PNL-SA-21566; CONF-9211163--1; ON: DE93005031
• Country of Publication: United States
• Language: English

Related Subjects

055001 -- Nuclear Fuels-- Safeguards
Inspection
& Accountability-- Technical Aspects
440800* -- Miscellaneous Instrumentation-- (1990-)
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450000 -- Military Technology
Weaponry
& National Defense
47 OTHER INSTRUMENTATION
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
CERAMICS
DETECTION
ELECTROMAGNETIC RADIATION
ELEMENTS
FREQUENCY RANGE
GHZ RANGE
HOLOGRAPHY
IMAGE PROCESSING
IMAGE SCANNERS
MATERIALS
METALS
MICROWAVE RADIATION
PERFORMANCE TESTING
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
PROCESSING
RADIATIONS
SYNTHETIC MATERIALS
TESTING
WEAPONS