Signal Processing Methods for Millimetrewave FMCW Radar with High Distance and Doppler Resolution

Vossiek, Martin; Kerssenbrock, T. v.; Heide, P.

doi:10.1109/euma.1997.337948

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…If a phase increment of 180 is chosen, then the target signal is sampled at the zero crossings of the reference signal, as shown in Fig. 12 [40]. Fig.…”

Section: Application For Industrial Sensorsmentioning

confidence: 99%

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

Reindl

Ruppel²,

Berek³

et al. 2001

IEEE Trans. Microwave Theory Techn.

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An inexpensive frequency-modulated continuous-wave (FMCW) radar system is presented in this paper, which, nevertheless, meets all industrial requirements. The FMCW radar uses a low-cost nonlinear voltage-controlled oscillator (VCO), operating at an IF of 2.45 GHz to generate the frequency modulation of the radar system. This VCO signal is applied twice, first to generate the radar transmitter signal at 24 GHz, and then it is fed to a surface acoustic wave (SAW) delay line. The SAW delay line generates a fixed delay time, which corresponds with a fixed radar distance. Thus, all systematic nonlinearities and stochastic phase errors of the FMCW system can be monitored and, afterwards, can be compensated for in real time. This linearization technique leads to a significant enhancement in dynamic range for a FMCW radar system. For this FMCW system, SAW delay lines with a linear phase characteristic have been designed using a linear optimization program. The delay line consists of two chirped and weighted interdigital transducers. For high volume, low-cost, and high-yield production of the required SAW structures, with linewidths down to 0.3 m, technological improvements had to be achieved, especially in photolithography. Based on these design and fabrication techniques, delay lines at 2.45 GHz operating at the fundamental and third harmonic with bandwidths up to 800 MHz have been realized.

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“…If a phase increment of 180 is chosen, then the target signal is sampled at the zero crossings of the reference signal, as shown in Fig. 12 [40]. Fig.…”

Section: Application For Industrial Sensorsmentioning

confidence: 99%

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

Reindl

Ruppel²,

Berek³

et al. 2001

IEEE Trans. Microwave Theory Techn.

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“…Advanced Doppler systems can detect the direction of movement using IQ demodulation, side band filtering or carrier demodulation [2]. Also, the distance to the target can be estimated with Frequency Modulated Continuous Wave (FMCW) systems [13]. These features are not implemented by the HB100 sensor.…”

Section: Principles Of Microwave Dopplermentioning

confidence: 99%

DeskWave

McIntosh

Fraser

Worgan

et al. 2017

Proceedings of the 2017 CHI Conference Extended Abstracts on Human Factors in Computing Systems

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Microwaves are a type of electromagnetic radiation that can pass through a variety of commonly found materials but partially reflect off human bodies. Microwaves are nonionizing and at controlled levels do not pose a danger. A wave that is capable of passing through materials could have useful applications in human-computer-interaction. However, only recently the full potential of microwaves for interactive devices has begun to be explored. Here, we present a scalable, low-cost system using an array of offthe-shelf microwave Doppler sensors and explore its potential for tabletop interactions. The arrays are installed beneath a desk, making it an ubiquitous device that enables a wide range of interactions such as 3D hand tracking, gesture recognition and different forms of tangible interaction. Given the low cost and availability of these sensors, we expect that this work will stimulate future interactive devices that employ microwave sensors.

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“…Based on this measurement a predistorted VCO modulation signal m(t) is calculated adaptively. The principle of the linearisation and calibration concept is described in [5] and [6].…”

Section: Geometrical Accuracy Analysismentioning

confidence: 99%

“…5 a typical spectrum of a measured signal is depicted, which illustrates the frequency components given by Eq. (6). Looking at the two spectral lines caused by the active reflector, it is obvious that the target distance dr can be derived from the frequency and phase difference between these two modulation components.…”

Section: Geometrical Accuracy Analysismentioning

confidence: 99%

Precise 3-D Object Position Tracking using FMCW Radar

Vossiek

Roskosch

Heide

1999

29th European Microwave Conference, 1999

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This paper presents a FMCW radar system for high precision three-dimensional object position tracking. Theoretical analyses of the 3-D triangulation concept and the accuracy lmits are given. Three 2.45 GHz radar modules measure the distance from different spatial locations to an active reflector unit installed on the object to be localised. By modulating the radar signal in the active reflector unit, disturbing echoes and clutter noise are suppressed. An advanced signal processing concept evaluates the difference of frequency and phase tenns of two adjacent modulation components. Test measurements demonstrate a 3-D position measurement with submillimetre precision. This performance makes the new approach suitable for a wide range of applications in robotics, industrial automation and in the medical area.

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Signal Processing Methods for Millimetrewave FMCW Radar with High Distance and Doppler Resolution

Cited by 7 publications

References 5 publications

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

DeskWave

Precise 3-D Object Position Tracking using FMCW Radar

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