Millimeter resolution SAR imaging of infrastructure in the lower THz region using MIRANDA-300

Stanko, Stephan; Palm, Stephan; Sommer, Rainer; Klöppel, Frank; Caris, M.; Pohl, Nils

doi:10.1109/eumc.2016.7824641

Cited by 27 publications

(14 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently many THz SAR testbeds are proposed in the literature with focus on short-range applications in the domain of defense/security [10], [11], automobile [12], [13], non-destructive testing (NDT) [14], and indoor room profiling [15]. With electronic transceiver modules, the SAR imaging testbeds are based on radar frontends [10]- [13] and vector network analyzers (VNA) with extension modules [14]- [17]. The radar-based testbed benefit with compactness but have limited bandwidth and lower dynamic range compared to the VNA-based.…”

Section: Introductionmentioning

confidence: 99%

“…The radar-based testbed benefit with compactness but have limited bandwidth and lower dynamic range compared to the VNA-based. For example, testbeds in [10], [12], [13] have system bandwidth of 28.8 GHz, 6 GHz, and 40 GHz with a center frequency of around 590.5 GHz, 150 GHz, and 290 GHz, respectively. On the contrary, the VNA-based testbed is bulky but provide very large bandwidth and high dynamic range.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Short-Range SAR Imaging From GHz to THz Waves

et al. 2021

View full text Add to dashboard Cite

Synthetic aperture radar (SAR) is a well-known imaging technique and most commonly used up to the microwave frequency spectrum (below 30 GHz) which provides spatial resolution in the sub-m range. To enhance the resolution, higher frequency spectra such as millimeter-wave (mmWave) and terahertz (THz) regions are being investigated. The mmWave and THz spectral ranges extend the SAR applications to nondestructive testing (NDT), material characterization, and sub-mm resolution imaging. However, the higher frequency spectrum suffers from higher path loss and potentially higher atmospheric absorption that limits the propagation distance. Nevertheless, the mmWave/THz spectrum is suitable for short-range applications such as indoor room profiling. From theoretical analysis, it can be summarized that the higher frequency spectrum provides better resolution but a comparative study on the impact on the image quality of the frequency spectrum ranging from GHz to THz has not been presented. Besides, as of the hardware complexity of the THz devices, the optimum range of the spectrum is always under investigation. The optimum range is defined where no strong improvements in the image quality are achievable with further increases in the frequency spectrum. Therefore, this paper presents an overview of electronics-based imaging using the SAR technique for the frequency spectrum ranging from GHz to THz with the focus on NDT and high-resolution imaging. Seven frequency bands: 5-10 GHz, 68-92 GHz, 75-110 GHz, 0.122-0.168 THz, 0.22-0.33 THz, 0.325-0.5 THz, and 0.85-1.1 THz are selected for a comparative analysis. The results are presented for 2D and 3D imaging using the backprojection algorithm. Additionally, state-of-the-art imaging based on SAR technique with electronics transceiver modules has only been demonstrated up to the sub-0.75 THz, whereas in this paper the spectrum up to 1.1 THz has been addressed.INDEX TERMS GHz and THz comparison, high-resolution imaging, non-destructive testing, synthetic aperture radar, terahertz imaging, radar imaging.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short-Range SAR Imaging From GHz to THz Waves

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Freiburg, Germany (e-mail: bersant.gashi@iaf.fraunhofer.de; laurenz.john@iaf.fraunhofer.de; dominik.meier@iaf.fraunhofer.de; markus.roesch@iaf.fraunhofer.de; sandrine.wagner@iaf.fraunhofer.de; axel.tessmann@iaf.fraunhofer.de; arnulf.leuther@iaf.fraunhofer.de; oliver.ambacher@iaf.fraunhofer.de; ruediger.quay@iaf.fraunhofer.de) T ERAHERTZ frequencies offer largely unrestricted and wide-band transmit/receive windows for the implementation of applications such as the inspection of composite materials [1]- [3], radar imaging [4]- [6], and data transfer over reasonable distances [7]- [11]. Such applications profit from the higher-available bandwidth (BW), which increases the achievable resolution in radar-based applications, and boosts data rates for wireless communication systems.…”

Section: Introductionmentioning

confidence: 99%

Broadband 400-GHz InGaAs mHEMT Transmitter and Receiver S-MMICs

Gashi

John

Meier

et al. 2021

IEEE Trans. THz Sci. Technol.

View full text Add to dashboard Cite

The modeling, design and experimental evaluation of both a 400-GHz transmitter and receiver submillimeter-wave monolithic integrated circuit (S-MMIC) is presented in this paper. These S-MMICs are intended for a radar-based system in the aforementioned operating frequency. The transmitter occupies a total chip area of 750 × 2750 µm 2 . It consists of a multiplier-by-four, generating the fourth-harmonic of the WR-10 input signal, which drives the integrated WR-2.2 power amplifier. The latter has an output-gate width of 128 µm. The receiver S-MMIC, 750 × 2750 µm 2 , consists of a multiplier-by-two, providing the second harmonic of the WR-10 input signal for the local-oscillator port of the subsequent integrated sub-harmonic mixer. The radio-frequency port of the latter, connects via a Lange coupler to a WR-2.2 low-noise amplifier (LNA). All the components included, are processed on a 35-nm InAlAs/InGaAs metamorphic high-electron-mobility transistor integrated-circuit technology, utilizing two-finger transistors and thin-film microstrip lines (TFMSLs). The modeling approach of the amplifier cores and the respective design decisions taken are listed and elaborated-on in this work. Accompanying measurements and simulations of the transmitter and receiver are presented. The individual components of the aforementioned S-MMICs, are characterized and the results are included in the paper. The state-of-the-art, for S-MMIC based circuits operating in the WR-2.2 band, is set by the LNA, on one side, spanning an operational 3-dB bandwidth (BW) of 310 to 475 GHz, with a peak gain of 23 dB and, on the other side, by the final transmitter design, which covers an operating range of 335 to 425 GHz with a peak-output power of 9.0 dBm and accompanying transducer gain of 11 dB. The included transmitterand receiver-designs represent a first-time implementation in the mentioned technological process, utilizing solely TFMSLs, boasting the integration level, operating in the WR-2.2 frequency band, and setting the state of the art-to the authors' best knowledge-for all S-MMIC based solutions in the respective frequency band, in terms of output power and gain over the operating 3-dB BW.

show abstract

“…Besides, the photon energy of THz waves is much lower than the familiar X-ray, causing nearly no harm to human bodies. The above advantages show the great potential of THz imaging and sensing in plenty of applications [2], including public security detection [3][4][5][6][7][8][9][10][11][12][13][14][15][16], radar imaging [17][18][19][20][21][22][23][24][25][26][27], non-destructive inspection [28,29], and biomedical testing [30].…”

Section: Introductionmentioning

confidence: 99%

“…What's worse, the imaging field of view (FOV) is limited. Another THz imaging scheme for the stationary scenario is the synthetic aperture radar (SAR) imaging [17][18][19][20][21], which realizes cross-range resolution by the movement of the radar system. Since the range resolution depends on the signal bandwidth, focused images can be obtained at any distance.…”

Section: Introductionmentioning

confidence: 99%

Adaptive 3D Imaging for Moving Targets Based on a SIMO InISAR Imaging System in 0.2 THz Band

et al. 2021

Remote Sensing

View full text Add to dashboard Cite

Terahertz (THz) imaging technology has received increased attention in recent years and has been widely applied, whereas the three-dimensional (3D) imaging for moving targets remains to be solved. In this paper, an adaptive 3D imaging scheme is proposed based on a single input and multi-output (SIMO) interferometric inverse synthetic aperture radar (InISAR) imaging system to achieve 3D images of moving targets in THz band. With a specially designed SIMO antenna array, the angular information of the targets can be determined using the phase response difference in different receiving channels, which then enables accurate tracking by adaptively adjusting the antenna beam direction. On the basis of stable tracking, the high-resolution imaging can be achieved. A combined motion compensation method is proposed to produce well-focused and coherent inverse synthetic aperture radar (ISAR) images from different channels, based on which the interferometric imaging is performed, thus forming the 3D imaging results. Lastly, proof-of-principle experiments were performed with a 0.2 THz SIMO imaging system, verifying the effectiveness of the proposed scheme. Non-cooperative moving targets were accurately tracked and the 3D images obtained clearly identify the targets. Moreover, the dynamic imaging results of the moving targets were achieved. The promising results demonstrate the superiority of the proposed scheme over the existing THz imaging systems in realizing 3D imaging for moving targets. The proposed scheme shows great potential in detecting and monitoring moving targets with non-cooperative movement, including unmanned military vehicles and space debris.

show abstract

Millimeter resolution SAR imaging of infrastructure in the lower THz region using MIRANDA-300

Cited by 27 publications

References 2 publications

Short-Range SAR Imaging From GHz to THz Waves

Short-Range SAR Imaging From GHz to THz Waves

Broadband 400-GHz InGaAs mHEMT Transmitter and Receiver S-MMICs

Adaptive 3D Imaging for Moving Targets Based on a SIMO InISAR Imaging System in 0.2 THz Band

Contact Info

Product

Resources

About