Terahertz Imaging Systems With Aperture Synthesis Techniques

Krozer, Viktor; Löffler, Thomas; Dall, Jørgen; Kusk, Anders; Eichhorn, Finn; Olsson, Rasmus K.; Buron, J.; Jepsen, Peter Uhd; Zhurbenko, Vitaliy; Jensen, Thomas

doi:10.1109/tmtt.2010.2050246

Cited by 103 publications

(30 citation statements)

References 91 publications

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“…Hence, the imaging resolution and the scene size require either a big antenna aperture or a mechanical scanning architecture [11]. But the beam scanning imaging is often time consuming, and a big antenna aperture can always be replaced by the synthetic aperture technique [12]. Beside the cross-range resolution by the synthetic aperture technique, conventional inverse synthetic aperture radar (ISAR) system achieves the range resolution by transmitting wideband signals.…”

Section: Introductionmentioning

confidence: 99%

Bistatic Terahertz Radar Azimuth-Elevation Imaging Based on Compressed Sensing

Wang

Deng

Qin

et al. 2014

IEEE Trans. THz Sci. Technol.

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Terahertz (THz) radar imaging can achieve high range resolution for transmitting of wideband signals. High cross-range resolution can be achieved simultaneously with small rotation angles for the tiny wavelength. However, the radar echo should be sampled according to the Nyquist theory and the imaging should ensure that the unambiguous range is large than the size of targets, which limits its application from both data collection and data storage perspectives. In this paper, a bistatic THz radar azimuth-elevation imaging scheme based on compressed sensing is proposed. By exploiting the sparsity of the space distribution in the imaging plane, it is sufficient to reconstruct images of targets with a small number of random measurements within the radar aperture. This means that the limitation for the high resolution THz imaging of large targets can be overcome. The available high resolution bistatic images of targets, which show the target as it is observed, can be very useful for scattering understanding and target recognition at THz frequencies. Simulation results by the electromagnetic calculation data are presented to demonstrate the validity of the proposed method.Index Terms-Terahertz (THz) radar, bistatic radar imaging, azimuth-elevation imaging, compressed sensing, block sparse.

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Section: Introductionmentioning

confidence: 99%

Bistatic Terahertz Radar Azimuth-Elevation Imaging Based on Compressed Sensing

Wang

Deng

Qin

et al. 2014

IEEE Trans. THz Sci. Technol.

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“…THz has many advantages due to its unique electromagnetic wave band and has been found to be promising for plenty of applications, such as security and safety screening, non-destructive testing and evaluation [1][2][3][4][5][6][7]. In THz range, quasi-optics are universally used to achieve controlled propagation of radiation in free space.…”

Section: Introductionmentioning

confidence: 99%

Image reconstruction of targets illuminated by terahertz Gaussian beam with phase shift migration technique

Gao

et al. 2013

2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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“…In this regard, high interest was devoted to enhance performances of PMMW imaging systems for security. The aperture synthesis principle could reduce the volume of the imaging system and improve its performances [3], [4]. In fact, by eliminating focusing lenses, mirrors and mechanical scanners, the imaging system volume can be dramatically reduced [5].…”

Section: Introductionmentioning

confidence: 99%

Passive millimeter wave imaging: 2D sparse array optimization for low cost system architecture

Aouial

Méric

Lafond

et al. 2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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In order to reduce the cost of passive imaging systems, the use of the switch matrix instead of the standard multi-channel acquisition schema is considered as a good strategy. However, the design of a switching matrix for millimeter wave imaging applications is a complex task, in particular on a 2D array which it depends mainly on the array topology, channels number and the required performances. In this work, an optimization methodology is proposed, which, for any given aperture size, can yield the optimum sparse array configurations with a very low redundancy and an optimized switching process. The goal is to reduce the complexity and the cost of the system architecture while maintaining high performances. Numerical results confirm a great efficiency of the proposed method. A good trade-off among the cost, performances and system complexity is reported.

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Terahertz Imaging Systems With Aperture Synthesis Techniques

Cited by 103 publications

References 91 publications

Bistatic Terahertz Radar Azimuth-Elevation Imaging Based on Compressed Sensing

Bistatic Terahertz Radar Azimuth-Elevation Imaging Based on Compressed Sensing

Image reconstruction of targets illuminated by terahertz Gaussian beam with phase shift migration technique

Passive millimeter wave imaging: 2D sparse array optimization for low cost system architecture

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