330 GHz FMCW Image Sensor for Homeland Security Applications

Kapilevich, B.; Pinhasi, Y.; Arusi, Ruth; Anisimov, M. M.; Hardon, Danny; Litvak, B.; Wool, Y.

doi:10.1007/s10762-010-9702-4

Cited by 27 publications

(14 citation statements)

References 8 publications

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“…The St. Andrews imaging radar uses a small, fast-scanning, galvanometer-based subreflector to achieve remarkably high frame rates of 10 Hz, but with a smaller (50 # 50 cm) field of view (FoV). Other radars in the 300-340 GHz range have also been reported by groups in Israel [5], [6] and Spain [7]. Researchers in Germany have developed radars operating around 300 GHz and near 650 GHz [8], [9], where the next-higher atmospheric transmission window lies.…”

Section: Submm-wave Radar Worldwidementioning

confidence: 86%

Submillimeter-Wave Radar: Solid-State System Design and Applications

Cooper

Chattopadhyay

2014

IEEE Microwave

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Section: Submm-wave Radar Worldwidementioning

confidence: 86%

Submillimeter-Wave Radar: Solid-State System Design and Applications

Cooper

Chattopadhyay

2014

IEEE Microwave

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“…Figure 3(a) shows the 2D random sampling pattern with 50% of the measurements removed. Due to the high system cost and lack of mature planar array technique, systems using the frequency approaching the terahertz range are always operated at the single-pixel mode [29,30]. As for the single-pixel system, the undersampling pattern M can simply be the 2D random sampling pattern (pattern A).…”

Section: B Design Of the Measurement Matrixmentioning

confidence: 99%

Compressive sensing for direct millimeter-wave holographic imaging

et al. 2015

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Direct millimeter-wave (MMW) holographic imaging, which provides both the amplitude and phase information by using the heterodyne mixing technique, is considered a powerful tool for personnel security surveillance. However, MWW imaging systems usually suffer from the problem of high cost or relatively long data acquisition periods for array or single-pixel systems. In this paper, compressive sensing (CS), which aims at sparse sampling, is extended to direct MMW holographic imaging for reducing the number of antenna units or the data acquisition time. First, following the scalar diffraction theory, an exact derivation of the direct MMW holographic reconstruction is presented. Then, CS reconstruction strategies for complex-valued MMW images are introduced based on the derived reconstruction formula. To pursue the applicability for near-field MMW imaging and more complicated imaging targets, three sparsity bases, including total variance, wavelet, and curvelet, are evaluated for the CS reconstruction of MMW images. We also discuss different sampling patterns for single-pixel, linear array and two-dimensional array MMW imaging systems. Both simulations and experiments demonstrate the feasibility of recovering MMW images from measurements at 1/2 or even 1/4 of the Nyquist rate.

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“…In 2013, they continuously developed a 300-GHz system which obtained a 3.7-mm resolution [12]. Beside these two forerunners, more and more organizations started to develop their own systems and many remarkable achievements had been made [13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Wide-Angle Imaging and Analysis on Plane-wave Criteria Based on Inverse Synthetic Aperture Techniques

Gao

Qin

Deng

et al. 2016

J Infrared Milli Terahz Waves

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This paper presents two parts of work around terahertz imaging applications. The first part aims at solving the problems occurred with the increasing of the rotation angle. To compensate for the nonlinearity of terahertz radar systems, a calibration signal acquired from a bright target is always used. Generally, this compensation inserts an extra linear phase term in the intermediate frequency (IF) echo signal which is not expected in large-rotation angle imaging applications. We carried out a detailed theoretical analysis on this problem, and a minimum entropy criterion was employed to estimate and compensate for the linear-phase errors. In the second part, the effects of spherical wave on terahertz inverse synthetic aperture imaging are analyzed. Analytic criteria of plane-wave approximation were derived in the cases of different rotation angles. Experimental results of corner reflectors and an aircraft model based on a 330-GHz linear frequency-modulated continuous wave (LFMCW) radar system validated the necessity and effectiveness of the proposed compensation. By comparing the experimental images obtained under plane-wave assumption and spherical-wave correction, it also showed to be highly consistent with the analytic criteria we derived.

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330 GHz FMCW Image Sensor for Homeland Security Applications

Cited by 27 publications

References 8 publications

Submillimeter-Wave Radar: Solid-State System Design and Applications

Submillimeter-Wave Radar: Solid-State System Design and Applications

Compressive sensing for direct millimeter-wave holographic imaging

Terahertz Wide-Angle Imaging and Analysis on Plane-wave Criteria Based on Inverse Synthetic Aperture Techniques

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