94-GHz Imager With Extended Depth of Field

Author

Mait, Joseph N. ; Wikner, David A. ; Mirotznik, Mark S. ; Van der Gracht, Joseph ; Behrmann, Gregory P. ; Good, Brandon L. ; Mathews, Scott A.

Author_Institution

U.S. Army Res. Lab., Adelphi, MD

Volume

57

Issue

6

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

1713

Lastpage

1719

Abstract

We describe a computational imaging technique to extend the depth-of-field of a 94-GHz imaging system. The technique uses a cubic phase element in the pupil plane of the system to render system operation relatively insensitive to object distance. However, the cubic phase element also introduces aberrations but, since these are fixed and known, we remove them using post-detection signal processing. We present experimental results that validate system performance and indicate a greater than four-fold increase in depth-of-field from 17rdquo to greater than 68rdquo.

Keywords

millimetre wave imaging; signal processing; computational imaging; cubic phase element; depth-of-field; frequency 90 GHz; millimeter wave imaging; post-detection signal processing; render system operation; Clothing; Frequency; Helium; Millimeter wave technology; Optical imaging; Optical signal processing; Signal design; Signal processing; System performance; Weapons; Computational imaging; extended depth of field; millimeter wave imaging;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2009.2019882

Filename

5062508