A Through-Dielectric Radar Imaging System

被引：65

作者：

Charvat, Gregory L. ^{[1
]}

Kempel, Leo C. ^{[2
]}

Rothwell, Edward J. ^{[2
]}

Coleman, Christopher M. ^{[3
]}

Mokole, Eric L. ^{[4
]}

机构：

[1] MIT, Lincoln Lab, Lexington, MA 02420 USA

[2] Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA

[3] Integr Applicat Inc, Chantilly, VA 20151 USA

[4] USN, Res Lab, Washington, DC 20375 USA

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2010年 / 58卷 / 08期

关键词：

Dielectric slab; frequency modulated continuous wave (FMCW); linear FM; linear frequency modulation (LFM); low-power radar; pulse compresion; radar imaging; rail SAR; synthetic aperture radar; through lossy-dielectric slab imaging; ultrawideband radar;

D O I：

10.1109/TAP.2010.2050424

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Through-lossy-slab radar imaging will be shown at stand-off ranges using a low-power, ultrawideband (UWB), frequency modulated continuous wave (FMCW) radar system. FMCW is desirable for through-slab applications because of the signal gain resulting from pulse compression of long transmit pulses (1.926-4.069 GHz chirp in 10 ms). The difficulty in utilizing FMCW radar for this application is that the air-slab boundary dominates the scattered return from the target scene and limits the upper bound of the receiver dynamic range, reducing sensitivity for targets behind the slab. A method of range-gating out the air-slab boundary by significant band-limiting of the IF stages facilitates imaging of low radar cross section (RCS) targets behind the slab. This sensor is combined with a 1D linear rail and utilized as a rail synthetic aperture radar (SAR) imaging system. A 2D model of a slab and cylinder shows that image blurring due to the slab is negligible when the SAR is located at a stand-off range of 6 m or greater, and thus, the two-way attenuation due to wave propagation through the slab is the greatest challenge at stand-off ranges when the air-slab boundary is range-gated out of the scattered return. Measurements agree with the model, and also show that this radar is capable of imaging target scenes of cylinders and rods 15.24 cm in height and 0.95 cm in diameter behind a 10 cm thick lossy dielectric slab. Further, this system is capable of imaging free-space target scenes with transmit power as low as 5 pW, providing capability for RCS measurement.

引用

页码：2594 / 2603

页数：10

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