UWB Millimeter-Wave FMCW Radar using Hubert Transform Methods

Detlefsen, J.; Dallinger, Alexander; Schelkshorn, S.; Bertl, Sebastian

doi:10.1109/isssta.2006.311731

Cited by 21 publications

(16 citation statements)

References 3 publications

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“…In practice, the radar does not return the complex signal in (5) as it lacks of an IQ mixer. However, thanks to the wideband nature of the signal, the analytic signal can be easily retrieved by means of an efficient Hilbert transform [28].…”

Section: B Imaging Techniquementioning

confidence: 99%

Freehand, Agile, and High-Resolution Imaging With Compact mm-Wave Radar

et al. 2019

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The aim of this paper is to present a freehand scanning system with a compact mm-wave radar. In order to achieve high-resolution images, the system exploits the free movements of the radar to create a synthetic aperture. However, in contrast to conventional synthetic aperture radar (SAR), in which canonical acquisition surfaces (e.g., planes or cylinders) are used, the system allows for a given tolerance compatible with real handmade trajectories. Moreover, different techniques are studied to compensate for the impact of irregular sampling to reduce the artifacts in the image. As a result, real-time scanning can be readily performed even by inexperienced users. The scanning system, comprising a commercial motion capture system and an mm-wave module, can be easily deployed and calibrated. Several results involving different objects are shown to illustrate the performance of the system. INDEX TERMS SAR imaging, mm-wave imaging, FMCW radar, real-time imaging, freehand scanner.

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Section: B Imaging Techniquementioning

confidence: 99%

Freehand, Agile, and High-Resolution Imaging With Compact mm-Wave Radar

et al. 2019

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“…A voltage-controlled oscillator (VCO) is driven by the output of a digital-to-analog converter of a data acquisition unit (DAQ, model PCI-6115 from National Instruments, Austin, TX, USA) to generate an FMCW oscillation with a modulation range from 11.8 GHz to 18.2 GHz. We assumed a linear frequency modulation for our model-based signal processing approach and compensated for nonlinearities of the voltage to frequency relation of the VCO by predistortion [24]. The output drives both, an active multiplier chain and a harmonic mixing receiver, which are attached to a directional coupler with a transmitting and receiving antenna.…”

Section: Fmcw Thickness Measurementsmentioning

confidence: 99%

Multilayer Thickness Measurements below the Rayleigh Limit Using FMCW Millimeter and Terahertz Waves

Schreiner

Sauer-Greff

Urbansky

et al. 2019

Sensors

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We present thickness measurements with millimeter and terahertz waves using frequency-modulated continuous-wave (FMCW) sensors. In contrast to terahertz time-domain spectroscopy (TDS), our FMCW systems provide a higher penetration depth and measurement rates of several kilohertz at frequency modulation bandwidths of up to 175 GHz. In order to resolve thicknesses below the Rayleigh resolution limit given by the modulation bandwidth, we employed a model-based signal processing technique. Within this contribution, we analyzed the influence of multiple reflections adapting a modified transfer matrix method. Based on a brute force optimization, we processed the models and compared them with the measured signal in parallel on a graphics processing unit, which allows fast calculations in less than 1 s. TDS measurements were used for the validation of our results on industrial samples. Finally, we present results obtained with reduced frequency modulation bandwidths, opening the window to future miniaturization based on monolithic microwave integrated circuit (MMIC) radar units.

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“…For this purpose a FMCW-radar sensor operating in W -band is used. The system itself is similar to the one described in [1] or [2] except that the bandwidth covers the whole W -band. Relevant parameters of the setup are summed up in Table I.…”

Section: Measurement Examplesmentioning

confidence: 99%

Comparative Description of Setups for MMW-Imaging of Persons

Bertl¹,

Detlefsen²

2009

2009 German Microwave Conference

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For the purpose of MMW-Imaging different setups can be considered. When active sensorics are applied the Synthetic Aperture Radar (SAR) concept is often used, since real apertures would require large dimensions in order to obtain the required resolutions. The resulting images show different characteristics, depending on shape and position of the synthetic aperture. Imaging results obtained with different configurations are compared. A method of comparing different setups is presented in the following.

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UWB Millimeter-Wave FMCW Radar using Hubert Transform Methods

Cited by 21 publications

References 3 publications

Freehand, Agile, and High-Resolution Imaging With Compact mm-Wave Radar

Freehand, Agile, and High-Resolution Imaging With Compact mm-Wave Radar

Multilayer Thickness Measurements below the Rayleigh Limit Using FMCW Millimeter and Terahertz Waves

Comparative Description of Setups for MMW-Imaging of Persons

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