Miniaturized 122 GHz ISM band FMCW radar with micrometer accuracy

Scherr, Steffen; Göttel, Benjamin; Ayhan, Serdal; Bhutani, Akanksha; Pauli, Mario; Winkler, Wolfgang; Scheytt, J. Christoph; Zwick, Thomas

doi:10.1109/eurad.2015.7346291

Cited by 48 publications

(21 citation statements)

References 6 publications

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“…On the contrary, radar sensors can work in a multi-sensor scenario and do not require a smooth target surface and dust-free environment. Traditional FMCW radar uses a chirp signal which requires a certain bandwidth to achieve a high distance accuracy [3][4][5]. Typically, the FMCW radar cannot share the spectrum with other FMCW radars.…”

mentioning

confidence: 99%

Micrometer Accuracy Phase Modulated Radar for Distance Measurement and Monitoring

An¹,

He²,

Li³

et al. 2020

IEEE Sensors J.

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An enhanced accuracy random binary phase modulated radar is proposed. It can be used in high accuracy monitoring in manufacturing. Compared with the traditional high accuracy radar using frequency modulated continuous wave (FMCW), the proposed radar system can be used in a multiuser scenario without occupying more bandwidth. A two-step distance estimation method is introduced to estimate the distance. First, the distance estimation accuracy is narrowed down to a half carrier wavelength by analyzing the envelope of the phase modulated signal. Then the carrier phase information increases the distance accuracy to several micrometers. An equalization method is introduced to solve the I/Q imbalance problem. The proposed radar system is demonstrated at a carrier frequency of 80 GHz with a bandwidth of 2 GHz. The measured distance error was within ±7 μm. In addition, a high measurement repetition rate of 500 kHz was reached which is suitable for real-time monitoring in automatic manufacturing.

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mentioning

confidence: 99%

Micrometer Accuracy Phase Modulated Radar for Distance Measurement and Monitoring

An¹,

He²,

Li³

et al. 2020

IEEE Sensors J.

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“…Future electronic terahertz systems profit from the tremendous development of millimeterwave and terahertz-integrated circuits, which can provide a significant cost reduction and allow for more compact system designs as well as highly integrated multistatic array solutions such as shown for microwave imaging in [55]. Besides stepped-frequency and FMCW radar approaches [56][57][58], also broadband pulsed systems can be considered [59].…”

Section: Discussionmentioning

confidence: 99%

Terahertz Quality Inspection for Automotive and Aviation Industries

Ellrich

Bauer

Schreiner

et al. 2019

J Infrared Milli Terahz Waves

131

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Nondestructive quality inspection with terahertz waves has become an emerging technology, especially in the automotive and aviation industries. Depending on the specific application, different terahertz systems-either fully electronic or based on optical laser pulses-cover the terahertz frequency region from 0.1 THz up to nearly 10 THz and provide high-speed volume inspections on the one hand and high-resolution thickness determination on the other hand. In this paper, we present different industrial applications, which we have addressed with our terahertz systems within the last couple of years. First, we show three-dimensional imaging of glass fiber-reinforced composites and foam structures, and demonstrate thickness determination of multilayer plastic tube walls. Then, we present the characterization of known and unknown multilayer systems down to some microns and the possibility of measuring the thickness of wet paints. The challenges of system reliability in industrial environments, e.g., under the impact of vibrations, and effective solutions are discussed. This paper gives an overview of state-of-the-art terahertz technology for industrial quality inspection. The presented principles are not limited to the automotive and aviation industries but can also be adapted to many other industrial fields.

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“…The distance accuracy is limited by the estimation accuracy of the variable n and φ. Interferometer based radars can accurately estimate φ but fail to estimate n. Therefore these radars can only track a target within a narrow observation window of a distance of half a wavelength of the carrier [6] [7]. On the other hand, FMCW radars can estimate n on the expense of utilizing wide bandwidth and long sweep time, however, estimating φ can be only made once each frequency sweep therefore the refresh rate is limited [3].…”

Section: Principle Of the Proposed Amcw Radarmentioning

confidence: 99%

“…Narrow band radars can operate next to each other when different RF channels are used, in addition radar can be used for target detection even in dusty environment. Traditional frequency modulated continuous wave (FMCW) radars require a certain bandwidth to achieve a high ranging accuracy [3] [4] [5]. This implies that with a limited available bandwidth, the amount of radars that can be used in the same area is also limited.…”

Section: Introduction Industry 40 Was Initially Proposed By the Gmentioning

confidence: 99%

AMCW Radar of Micrometer Accuracy Distance Measurement and Monitoring

Strömbeck

Zirath

2019

2019 IEEE MTT-S International Microwave Symposium (IMS)

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An Amplitude Modulated Continuous Wave (AMCW) radar system is proposed that uses both the phase from the envelope and carrier to achieve micrometer accuracy distance measurement. The system has the benefit of using only two frequencies instead of an entire frequency band which is the case with FMCW radars. Many radar systems can therefore be used in a small area without risking interference. An experimental radar setup at 78 GHz is measured and verified to have a measurement error magnitude of less than 10 micrometer. This system is suitable for modern manufacturing and industry.

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Miniaturized 122 GHz ISM band FMCW radar with micrometer accuracy

Cited by 48 publications

References 6 publications

Micrometer Accuracy Phase Modulated Radar for Distance Measurement and Monitoring

Micrometer Accuracy Phase Modulated Radar for Distance Measurement and Monitoring

Terahertz Quality Inspection for Automotive and Aviation Industries

AMCW Radar of Micrometer Accuracy Distance Measurement and Monitoring

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