% Encoding: UTF-8 @COMMENT{BibTeX export based on data in FAU CRIS: https://cris.fau.de/} @COMMENT{For any questions please write to cris-support@fau.de} @article{faucris.216337023, abstract = {
Vital parameters are key indicators for the assessment of health. Conventional methods rely on direct contact with the patients’ skin and can hence cause discomfort and reduce autonomy. This article presents a bistatic 24 GHz radar system based on an interferometric six-port architecture and features a precision of 1 µm in distance measurements. Placed at a distance of 40 cm in front of the human chest, it detects vibrations containing respiratory movements, pulse waves and heart sounds. For the extraction of the respiration rate, time-domain approaches like autocorrelation, peaksearch and zero crossing rate are compared to the Fourier transform, while template matching and a hidden semi-Markov model are utilized for the detection of the heart rate from sphygmograms and heart sounds. A medical study with 30 healthy volunteers was conducted to collect 5.5 h of data, where impedance cardiogram and electrocardiogram were used as gold standard for synchronously recording respiration and heart rate, respectively. A low root mean square error for the breathing rate (0.828 BrPM) and a high overall F1 score for heartbeat detection (93.14%) could be achieved using the proposed radar system and signal processing.}, author = {Michler, Fabian and Shi, Kilin and Schellenberger, Sven and Steigleder, Tobias and Malessa, Anke and Hameyer, Laura and Neumann, Nina and Lurz, Fabian and Ostgathe, Christoph and Weigel, Robert and Kölpin, Alexander}, doi = {10.3390/s19112492}, faupublication = {yes}, journal = {Sensors}, peerreviewed = {Yes}, title = {{A} {Clinically} {Evaluated} {Interferometric} {Continuous}-{Wave} {Radar} {System} for the {Contactless} {Measurement} of {Human} {Vital} {Parameters}}, url = {https://www.mdpi.com/1424-8220/19/11/2492}, volume = {19}, year = {2019} } @inproceedings{faucris.106234964, abstract = {Vital sign monitoring systems play a crucial role in the medical environment. Patients in palliative and intensive care can especially benefit from continuous observation by detecting sudden changes in health status allowing the medical staff to promptly provide intensified symptom amelioration at the end-of-life. However, machine based monitoring like electrocardiography requires the patient being permanently wired to the device. This circumstance severely restricts the independence and mobility of the patient, leading to a decrease in the quality of life. For this reason, palliative care stations currently usually avoid continuous monitoring. After a comprehensive literature survey and background research, this paper presents a novel approach by using a single radar system to perform continuous and above all contactless monitoring of respiration and heartbeat. A continuous wave radar using the Six-Port technology is introduced and its feasibility, performance and real-time capability are validated in long-term measurements on different test persons. In comparison to gold standard reference devices a correlation of 97.6% was achieve}, author = {Shi, Kilin and Will, Christoph and Steigleder, Tobias and Michler, Fabian and Weigel, Robert and Ostgathe, Christoph and Kölpin, Alexander}, booktitle = {2018 Annual IEEE International Systems Conference (SysCon)}, date = {2018-04-23/2018-04-26}, doi = {10.1109/SYSCON.2018.8369507}, faupublication = {yes}, peerreviewed = {unknown}, title = {{A} {Contactless} {System} for {Continuous} {Vital} {Sign} {Monitoring} in {Palliative} and {Intensive} {Care}}, venue = {Vancouver, Kanada}, year = {2018} } @article{faucris.242322780, abstract = {Using Radar it is possible to measure vital signs through clothing or a mattress from the distance. This allows for a very comfortable way of continuous monitoring in hospitals or home environments. The dataset presented in this article consists of 24 h of synchronised data from a radar and a reference device. The implemented continuous wave radar system is based on the Six-Port technology and operates at 24 GHz in the ISM band. The reference device simultaneously measures electrocardiogram, impedance cardiogram and non-invasive continuous blood pressure. 30 healthy subjects were measured by physicians according to a predefined protocol. The radar was focused on the chest while the subjects were lying on a tilt table wired to the reference monitoring device. In this manner five scenarios were conducted, the majority of them aimed to trigger hemodynamics and the autonomic nervous system of the subjects. Using the database, algorithms for respiratory or cardiovascular analysis can be developed and a better understanding of the characteristics of the radar-recorded vital signs can be gaine}, author = {Schellenberger, Sven and Shi, Kilin and Steigleder, Tobias and Malessa, Anke and Michler, Fabian and Hameyer, Laura and Neumann, Nina and Lurz, Fabian and Weigel, Robert and Ostgathe, Christoph and Kölpin, Alexander}, doi = {10.1038/s41597-020-00629-5}, faupublication = {yes}, journal = {Scientific Data}, keywords = {Vital signs; Radar; Database; Reference signals}, peerreviewed = {Yes}, title = {{A} dataset of clinically recorded radar vital signs with synchronised reference sensor signals}, url = {https://www.nature.com/articles/s41597-020-00629-5}, year = {2020} } @article{faucris.275158124, abstract = {Radar systems allow for contactless measurements of vital signs such as heart sounds, the pulse signal, and respiration. This approach is able to tackle crucial disadvantages of state-of-the-art monitoring devices such as the need for permanent wiring and skin contact. Potential applications include the employment in a hospital environment but also in home care or passenger vehicles. This dataset consists of synchronised data which are acquired using a Six-Port-based radar system operating at 24 GHz, a digital stethoscope, an ECG, and a respiration sensor. 11 test subjects were measured in different defined scenarios and at several measurement positions such as at the carotid, the back, and several frontal positions on the thorax. Overall, around 223 minutes of data were acquired at scenarios such as breath-holding, post-exercise measurements, and while speaking. The presented dataset contains reference-labeled ECG signals and can therefore easily be used to either test algorithms for monitoring the heart rate, but also to gain insights about characteristic effects of radar-based vital sign monitoring.}, author = {Shi, Kilin and Schellenberger, Sven and Will, Christoph and Steigleder, Tobias and Michler, Fabian and Fuchs, Jonas and Weigel, Robert and Ostgathe, Christoph and Koelpin, Alexander}, doi = {10.1038/s41597-020-0390-1}, faupublication = {yes}, journal = {Scientific Data}, note = {EVALuna2:415941}, peerreviewed = {Yes}, title = {{A} dataset of radar-recorded heart sounds and vital signs including synchronised reference sensor signals.}, volume = {7}, year = {2020} } @article{faucris.259331339, abstract = {In this paper, we demonstrate a digital correction method for extending the dynamic range of a six-port radar system based on detector diodes. An individual diode gain is considered to depend on output voltage, which can be approximated as a linear function in order to extrapolate the diode's square-law response to higher input powers. The individual diode coefficients are extracted during an initial calibration measurement utilizing the interferometric working principle. A six-port junction in combination with power detectors based on Si Schottky diodes operating at 24GHz has been employed to validate the concept. Reduction of the 3rd-and 5th-order harmonic of up to 35dB and 22dB, respectively, have been achieved at the highest input power of 8dBm. The correction was applied for a wide range of operating conditions. As a result, the increase of phase error under large-signal and high power operation is effectively compensated and remains as low as under small-signal conditions. Thus, phase accuracy is maintained beyond the classical dynamic range of detector diodes in six-port applications so far.
nervous system (ANS) and provides crucial information on the health status of a person, would
provide great benefits for both patients and doctors during prevention and aftercare. However, gold
standard devices to record the HRV, such as the electrocardiograph, have the common disadvantage
that they need permanent skin contact with the patient. Being connected to a monitoring device
by cable reduces the mobility, comfort, and compliance by patients. Here, we present a contactless
approach using a 24 GHz Six-Port-based radar system and an LSTM network for radar heart sound
segmentation. The best scores are obtained using a two-layer bidirectional LSTM architecture. To
verify the performance of the proposed system not only in a static measurement scenario but also
during a dynamic change of HRV parameters, a stimulation of the ANS through a cold pressor test is
integrated in the study design. A total of 638 minutes of data is gathered from 25 test subjects and
is analysed extensively. High F-scores of over 95% are achieved for heartbeat detection. HRV indices
such as HF norm are extracted with relative errors around 5%. Our proposed approach is capable to
perform contactless and convenient HRV monitoring and is therefore suitable for long-term recordings
in clinical environments and home-care scenario},
author = {Shi, Kilin and Steigleder, Tobias and Schellenberger, Sven and Michler, Fabian and Malessa, Anke and Lurz, Fabian and Rohleder, Nicolas and Ostgathe, Christoph and Weigel, Robert and Kölpin, Alexander},
doi = {10.1038/s41598-021-81101-1},
faupublication = {yes},
journal = {Scientific Reports},
keywords = {hrv, radar, vitalparameter, herztöne, berührungslos, herzratenvariabilität},
peerreviewed = {Yes},
title = {{Contactless} analysis of heart rate variability during cold pressor test using radar interferometry and bidirectional {LSTM} networks},
url = {https://www.nature.com/articles/s41598-021-81101-1},
volume = {11},
year = {2021}
}
@inproceedings{faucris.202749417,
abstract = {Cardiovascular diseases are one of the major causes of death. Regular
checkups and preventive actions can drastically help reducing fatal
incidences. This can be achieved by monitoring the carotid artery or
rather the carotid pulse signal. Commonly, ultrasound devices are used
for that purpose. However, these devices are costly, mostly stationary
and their usage requires training and experience. This paper
investigates the possible usage of radar systems as a contactless and
low-cost alternative for carotid pulse measurements. Theoretical
investigations reveal a linear relationship between the measurands of
both devices and synchronous recordings from three test persons further
confirm the feasibility of using radar systems as a potential device for
monitoring cardiovascular disease},
author = {Shi, Kilin and Schellenberger, Sven and Steigleder, Tobias and Michler, Fabian and Lurz, Fabian and Weigel, Robert and Kölpin, Alexander},
booktitle = {2018 Asia-Pacific Microwave Conference},
date = {2018-11-06/2018-08-09},
doi = {10.23919/apmc.2018.8617522},
faupublication = {yes},
peerreviewed = {unknown},
title = {{Contactless} {Carotid} {Pulse} {Measurement} {Using} {Continuous} {Wave} {Radar}},
venue = {Kyoto},
year = {2018}
}
@article{faucris.243643111,
author = {Schellenberger, Sven and Shi, Kilin and Michler, Fabian and Lurz, Fabian and Weigel, Robert and Kölpin, Alexander},
doi = {10.3390/s20205827},
faupublication = {yes},
journal = {Sensors},
peerreviewed = {Yes},
title = {{Continuous} {In}-{Bed} {Monitoring} of {Vital} {Signs} {Using} a {Multi} {Radar} {Setup} for {Freely} {Moving} {Patients}},
url = {https://www.mdpi.com/1424-8220/20/20/5827},
year = {2020}
}
@book{faucris.276088204,
address = {München},
author = {Michler, Fabian},
edition = {1},
faupublication = {yes},
isbn = {978-3-8439-5063-3},
peerreviewed = {Yes},
publisher = {Dr. Hut Verlag},
title = {{Dauerstrich}-{Radarverfahren} zur berührungslosen {Detektion} menschlicher {Vitalparameter} im 24-{GHz}-{ISM}-{Band}},
url = {https://www.dr.hut-verlag.de/978-3-8439-5063-3.html},
year = {2022}
}
@article{faucris.313090504,
author = {Scheiner, Benedict and Michler, Fabian},
faupublication = {no},
journal = {Elektronikpraxis - Profiline},
pages = {62-64},
peerreviewed = {No},
title = {{Den} {Herzschlag} berührungslos und präzise messen},
url = {https://www.elektronikpraxis.de/entwicklungen-anwendungen-radartechnologie-medizin-industrie-a-fa0417682975e07d05e07b9a63dedf4e/},
year = {2023}
}
@article{faucris.283411552,
author = {Probst, Florian and Scheiner, Benedict and Michler, Fabian and Weigel, Robert and Lurz, Fabian},
doi = {10.1109/TIM.2022.3218300},
faupublication = {yes},
journal = {IEEE Transactions on Instrumentation and Measurement},
pages = {1-9},
peerreviewed = {Yes},
title = {{Design} and {Evaluation} of a {Low}-{Cost} {SAW} {Resonator} {Read}-{Out} {System} at 2.4 {GHz}},
volume = {71},
year = {2022}
}
@inproceedings{faucris.204085644,
author = {Scheiner, Benedict and Lurz, Fabian and Michler, Fabian and Lau, Isabella and Lichtblau, Johann and Weigel, Robert and Kölpin, Alexander},
booktitle = {IEEE Radio and Wireless Symposium (RWS)},
date = {2019-01-20/2019-01-23},
doi = {10.1109/RWS.2019.8714480},
faupublication = {yes},
month = {Jan},
pages = {1-3},
peerreviewed = {unknown},
title = {{Design} of a {Rotary} {Coupler} for {Data} {Transmission} on {Fast} {Rotating} {Mechanical} {Shafts} and {Roboter} {Arms}},
venue = {Orlando, FL},
year = {2019}
}
@inproceedings{faucris.202229996,
abstract = {This paper presents a topology optimization approach to design planar
transitions between a microstrip line (MSL) and a rectangular waveguide
(RWG) in the K-band. The transition comprises two sub-transitions: one
from the MSL to a substrate integrated waveguide (SIW) and the second
from the SIW to the RWG. Both are on the same substrate and can be
manufactured with a standard printed circuit board process. This leads
to a very cost-effective solution compared with other approaches. A
WR-42 waveguide can easily be surface mounted to the transitions using a
standard flange. The transitions have been fabricated, and their
measured performance shows good agreement with the simulations. The
MSL-SIW transition has a broadband behavior and the SIW-RWG transition
still reaches a relative bandwidth of 10},
author = {Hassan, Emadeldeen and Berggren, Martin and Scheiner, Benedict and Michler, Fabian and Weigel, Robert and Lurz, Fabian},
booktitle = {IEEE Radio and Wireless Symposium (RWS)},
date = {2019-01-20/2019-01-23},
doi = {10.1109/RWS.2019.8714566},
faupublication = {yes},
month = {Jan},
pages = {1-3},
peerreviewed = {unknown},
title = {{Design} of {Planar} {Microstrip}-to-{Waveguide} {Transitions} using {Topology} {Optimization}},
venue = {Orlando, FL},
year = {2019}
}
@inproceedings{faucris.264471092,
author = {Michler, Fabian and Neugebauer, Marcel and Scheiner, Benedict and Weigel, Robert and Lurz, Fabian},
booktitle = {2022 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT)},
date = {2022-01-16/2022-01-19},
doi = {10.1109/WiSNet53095.2022.9721354},
faupublication = {yes},
isbn = {978-1-6654-3465-2},
month = {Jan},
pages = {18-21},
peerreviewed = {Yes},
title = {{Digital} {Frequency} {Control} {Loop} for {Continuous}-{Wave} and {Stepped}-{Frequency} {Radars}},
venue = {Las Vegas, NV},
year = {2022}
}
@inproceedings{faucris.301670574,
author = {Reese, Roland and Michler, Fabian and Scheiner, Benedict and Radermacher, Eva},
booktitle = {European Microwave Conference},
date = {2023-09-17/2023-09-22},
doi = {10.23919/EuMC58039.2023.10290605},
faupublication = {no},
isbn = {978-2-87487-072-9},
peerreviewed = {unknown},
title = {{EMF}-{Measurements} of {Rooftop} {Attenuation} of {Cellular} {Radio} {Base} {Stations} {Deployed} on {Gable} {Roofs}},
venue = {Berlin},
year = {2023}
}
@inproceedings{faucris.108238064,
abstract = {Highly precise sensor systems for contactless displacement measurements play an important role within the industrial application field. Various radar based measurement systems utilizing different techniques have been published for this purpose, but the influence of the ambient temperature on the measurement results has only rarely been investigated, yet. Whereas many publications deal with research on temperature compensation of single components, this paper describes the influence of the ambient temperature on the entire RF front end of the sensor system, a 61 GHz Six-Port interferometer. After presenting the measurement system, the temperature influences on the four output voltages and the consequences for the measurement results are analyzed. Finally, a compensation algorithm is proposed to decrease the temperature induced impairments of the systematic measurement error.},
author = {Will, Christoph and Mann, Sebastian and Michler, Fabian and Reißland, Torsten and Lurz, Fabian and Weigel, Robert and Kölpin, Alexander},
booktitle = {2017 IEEE Asia Pacific Microwave Conference (APMC)},
date = {2017-11-13/2017-11-16},
doi = {10.1109/APMC.2017.8251384},
faupublication = {yes},
pages = {89-92},
peerreviewed = {Yes},
publisher = {IEEE},
title = {{Error} {Compensation} of the {Temperature} {Influence} on {Radar} based {Displacement} {Measurements}},
venue = {Kuala Lumpur},
year = {2017}
}
@inproceedings{faucris.264199354,
author = {Scheiner, Benedict and Graef, Florian and Michler, Fabian and Weigel, Robert and Lurz, Fabian},
booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks 2022},
doi = {10.1109/WiSNet53095.2022.9721367},
faupublication = {yes},
peerreviewed = {unknown},
title = {{Evaluation} of {Embedded} {Algorithms} for a {Six}-{Port}-{Based} {Frequency} {Measurement} {System}},
venue = {Las Vegas, Nevada, USA},
year = {2022}
}
@inproceedings{faucris.106328904,
author = {Scheiner, Benedict and Lurz, Fabian and Michler, Fabian and Lindner, Stefan and Linz, Sarah and Weigel, Robert and Kölpin, Alexander},
booktitle = {German Microwave Conference},
date = {2018-03-12/2018-03-14},
doi = {10.23919/GEMIC.2018.8335070},
faupublication = {yes},
pages = {223-226},
peerreviewed = {unknown},
title = {{Fast} {Dual}-{Synthesizer} for {Six}-{Port} {In}-{Situ} {Linearization} in the 2,4 {GHz} {ISM}-{Band}},
venue = {Freiburg},
year = {2018}
}
@inproceedings{faucris.221503913,
author = {Scheiner, Benedict and Lurz, Fabian and Michler, Fabian and Weigel, Robert and Kölpin, Alexander},
booktitle = {Asia-Pacific Microwave Conference (APMC19)},
date = {2019-12-10/2019-09-13},
doi = {10.1109/APMC46564.2019.9038210},
faupublication = {yes},
peerreviewed = {Yes},
title = {{Frequency} {Readjustment} of {Excitation} {Signals} for {Resonant} {Surface} {Acoustic} {Wave} {Sensors} in the 2.45 {GHz} {ISM} {Band}},
url = {https://ieeexplore.ieee.org/document/9038210},
venue = {Singapore},
year = {2019}
}
@inproceedings{faucris.227012865,
author = {Scheiner, Benedict and Lurz, Fabian and Michler, Fabian and Weigel, Robert and Kölpin, Alexander},
booktitle = {Kleinheubacher Tagung},
date = {2019-09-23/2019-09-25},
editor = {IEEE},
faupublication = {yes},
isbn = {978-3-948571-00-9},
peerreviewed = {unknown},
title = {{Frequency} {Response} {Characterization} of {Surface} {Acoustic} {Wave} {Resonators} {Using} a {Six}-{Port} {Frequency} {Measurement} {System}},
url = {https://ieeexplore.ieee.org/document/8890082},
venue = {Miltenberg},
year = {2019}
}
@inproceedings{faucris.289662753,
author = {Michler, Fabian},
booktitle = {IEEE Radio and Wireless Symposium (RWS)},
date = {2023-01-22/2023-01-25},
faupublication = {yes},
month = {Jan},
peerreviewed = {No},
title = {{Fundamentals} and {System} {Design} {Challenges} in {Radar}-{Based} {Vital} {Sign} {Sensing}},
venue = {Las Vegas, NV},
year = {2023}
}
@inproceedings{faucris.280931804,
abstract = {This paper presents an approach for improving a previously presented velocity estimation system, dedicated for the application on trains. The systems operation is based on the correlation of the received signals from two radar receivers. So far, only the magnitudes of the signals in range domain were considered in the correlation, as including the phase leads to undesired complexities. These complexities and their handling are presented in this work. Furthermore, the improved approach is compared to the previous approach as well as to competing systems.},
author = {Reißland, Torsten and Michler, Fabian and Weigel, Robert and Koelpin, Alexander and Lurz, Fabian},
booktitle = {2021 18th European Radar Conference, EuRAD 2021},
date = {2022-04-05/2022-04-07},
doi = {10.23919/EuRAD50154.2022.9784560},
faupublication = {yes},
isbn = {9782874870651},
keywords = {correlation; radar; rail transportation; velocity measurement},
note = {Created from Fastlane, Scopus look-up},
pages = {185-188},
peerreviewed = {Yes},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
title = {{Implementation} and {Assessment} of a {Radar} {Based} {True}-{Speed}-{Over}-{Ground} {Estimation} {Approach} {Utilizing} {Complex}-{Valued} {Correlation}},
venue = {London},
year = {2022}
}
@inproceedings{faucris.273220842,
abstract = {In this paper we present an experimental examination on the influence of self-interference in a true-speed-overground measurement system. The setup is based on two antenna pairs, in which interference is to be expected if they transmit simultaneously. This work compares the estimation results for simultaneous and for time division multiplexed transmission. Furthermore, an approach for the decoupling of the receive channels is introduced and examined.},
author = {Reißland, Torsten and Michler, Fabian and Weigel, Robert and Koelpin, Alexander and Lurz, Fabian},
booktitle = {2022 IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNeT 2022},
date = {2022-01-16/2022-01-19},
doi = {10.1109/WiSNet53095.2022.9721361},
faupublication = {yes},
isbn = {9781665434652},
keywords = {correlation; interference; radar; rail transportation; velocity measurement},
note = {CRIS-Team Scopus Importer:2022-04-15},
pages = {8-10},
peerreviewed = {unknown},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
title = {{Influence} of {Self}-{Interference} in a {Radar} {System} for a {Correlation} {Based} {True}-{Speed}-{Over}-{Ground} {Estimation} {Approach}},
venue = {Las Vegas, NV, USA},
year = {2022}
}
@article{faucris.216484718,
abstract = {Accurate and precise knowledge of the relative permittivity of printed
circuit board (PCB) materials is essential for the reliable design of
high-frequency circuits. For simplicity reasons, planar, resonant
permittivity sensors, which are directly integrated on the unknown PCB
material, are widely used. However, the sensors are affected by the
nonidealities of the copper-clad laminate and PCB manufacturing process,
e.g., the difference in roughness between the top and bottom sides of
each metal layer. This paper analyzes the influence of these
nonidealities on the extracted relative permittivity values of different
sensor geometries in microstrip and substrate integrated waveguide
(SIW) technology up to 100 GHz. Microstrip resonators are very sensitive
against the investigated nonidealities. Additional roughness
measurements and more detailed simulation models cannot noticeably
reduce the uncertainties. SIW cavity sensors are more robust, and simple
modeling approaches lead to low uncertainties smaller than 0.05 for the
whole frequency range from 10 to 100 GH},
author = {Lau, Isabella and Hajian, Ali and Michler, Fabian and Gold, Gerald and Lurz, Fabian and Schmid, Ulrich and Helmreich, Klaus and Weigel, Robert and Kölpin, Alexander},
doi = {10.1109/TMTT.2019.2910114},
faupublication = {yes},
journal = {IEEE Transactions on Microwave Theory and Techniques},
keywords = {Accuracy;manufacturingn process; materials nondestructive testing; microwave measurements;permittivity; printed circuit boards (PCBs); surface roughness; uncertainty.},
pages = {2793-2804},
peerreviewed = {Yes},
title = {{Influence} of the {PCB} {Manufacturing} {Process} on the {Measurement} {Error} of {Planar} {Relative} {Permittivity} {Sensors} {Up} {To} 100 {GHz}},
url = {https://ieeexplore.ieee.org/document/8698275},
volume = {67},
year = {2019}
}
@article{faucris.281673359,
author = {Reese, Roland and Michler, Fabian and Scheiner, Benedict and Radermacher, Eva},
doi = {10.1109/ACCESS.2022.3204329},
faupublication = {no},
journal = {IEEE Access},
pages = {93971-93980},
peerreviewed = {Yes},
title = {{In}-{Situ} {EMF} {Measurements} of {Rooftop} {Attenuation} for {Assessment} of the {Compliance} {Boundary} of {Cellular} {Base} {Stations}},
volume = {10},
year = {2022}
}
@inproceedings{faucris.212606436,
author = {Scheiner, Benedict and Lurz, Fabian and Michler, Fabian and Weigel, Robert and Kölpin, Alexander},
booktitle = {European Microwave Week 2019},
date = {2019-09-30/2019-10-03},
doi = {10.23919/EuMC.2019.8910810},
faupublication = {yes},
pages = {539-542},
peerreviewed = {unknown},
title = {{In}-{Situ}-{Linearization} for {Instantaneous} {Frequency} {Measurement} {Systems}},
venue = {Paris},
year = {2019}
}
@article{faucris.203858370,
abstract = {Fokus der Palliativmedizin (PM) ist die persönliche Begegnung. Häufig
wird bei schwerer Krankheit auf apparative Therapie und Diagnostik
verzichtet. Dennoch könnten Biomarker (BM, zB Herz-und Atemfrequenz)
wichtige ergänzende Hinweise auf Symptomlast und zur individuellen
Anpassung der medikamentösen Behandlung geben. Wir erforschen den
innovativen Ansatz, BM mit Radartechnologie (RT) berührungs-und
belastungsfrei zu erfassen. Ziel soll es ua in sein, in Zukunft die
Symptomlinderung zu verbessern. RT, die auf einem interferometrischem
Verfahren beruht, erfasst Herzschläge und Atmung mittels Messung der
Distanzänderung zu der Radarantenne aus einigen Metern Entfernung und
durch Materialen wie Kleidung oder Bettdecke hindurch. Lernende
Algorithmen extrahieren die spezifischen Signale und werten sie
automatisiert au},
author = {Steigleder, Tobias and Malessa, Anke and Shi, Kilin and Michler, Fabian and Schellenberger, Sven and Heckel, Maria and Kölpin, Alexander and Ostgathe, Christoph},
doi = {10.1055/s-0038-1669350},
faupublication = {yes},
journal = {Zeitschrift für Palliativmedizin},
peerreviewed = {No},
title = {{Kontinuierliche} berührungslose {Erfassung} von {Herzschlag} und {Atmung} als {Surrogatparameter} für {Symptomlinderung}–eine {Pilotstudie}},
url = {https://www.thieme-connect.com/products/ejournals/abstract/10.1055/s-0038-1669350},
volume = {19},
year = {2018}
}
@article{faucris.123402224,
author = {Will, Christoph and Shi, Kilin and Schellenberger, Sven and Steigleder, Tobias and Michler, Fabian and Weigel, Robert and Ostgathe, Christoph and Kölpin, Alexander},
doi = {10.1109/JERM.2017.2766567},
faupublication = {yes},
journal = {IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology},
pages = {81-89},
peerreviewed = {Yes},
title = {{Local} {Pulse} {Wave} {Detection} using {Continuous} {Wave} {Radar} {Systems}},
volume = {1},
year = {2017}
}
@inproceedings{faucris.243538619,
author = {Scheiner, Benedict and Probst, Florian and Michler, Fabian and Weigel, Robert and Kölpin, Alexander and Lurz, Fabian},
booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks 2021},
date = {2021-01-17/2021-01-20},
doi = {10.1109/WiSNeT51848.2021.9413786},
faupublication = {yes},
peerreviewed = {Yes},
title = {{Low}-{Cost} {Six}-{Port} for {High}-{Volume} {Frequency} {Measurement} {Systems} in the 2.4 {GHz} {ISM}-{Band}},
venue = {San Diego, California},
year = {2021}
}
@article{faucris.208613711,
author = {Scheiner, Benedict and Schellenberger, Sven and Shi, Kilin and Heusinger, Elisabeth and Michler, Fabian and Lurz, Fabian and Weigel, Robert and Kölpin, Alexander},
doi = {10.1049/el.2018.7936},
faupublication = {yes},
journal = {Electronics Letters},
month = {Jan},
pages = {304-306},
peerreviewed = {Yes},
title = {{Low}-power contactless {LC}-tank based respiratory sensor},
year = {2019}
}
@inproceedings{faucris.120470944,
author = {Lurz, Fabian and Hofstetter, Patrick and Lindner, Stefan and Linz, Sarah and Michler, Fabian and Weigel, Robert and Kölpin, Alexander},
booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
date = {2018-01-14/2018-01-17},
doi = {10.1109/WISNET.2018.8311571},
faupublication = {yes},
month = {Jan},
pages = {84-87},
peerreviewed = {Yes},
publisher = {IEEE},
title = {{Low}-{Power} {Frequency} {Synthesizer} for {Multi}-{Tone} {Six}-{Port} {Radar}},
venue = {Anaheim, CA},
year = {2018}
}
@article{faucris.203795705,
author = {Michler, Fabian and Scheiner, Benedict and Lurz, Fabian and Weigel, Robert and Kölpin, Alexander},
doi = {10.1109/MMM.2018.2875612},
faupublication = {yes},
journal = {IEEE Microwave Magazine},
month = {Jan},
pages = {91-97},
peerreviewed = {Yes},
title = {({Micro})metering with {Microwaves}: {A} {Low}-{Cost} {Low}-{Power} {High}-{Precision} {Radar} {System}},
url = {https://ieeexplore.ieee.org/document/8575185},
volume = {20},
year = {2019}
}
@article{faucris.244557097,
author = {Michler, Fabian and Scheiner, Benedict and Reißland, Torsten and Weigel, Robert and Kölpin, Alexander},
doi = {10.1109/JMW.2020.3034988},
faupublication = {yes},
journal = {IEEE Journal of Microwaves},
month = {Jan},
pages = {202-217},
peerreviewed = {Yes},
title = {{Micrometer} sensing with microwaves: {Precise} radar systems for innovative measurement applications},
volume = {1},
year = {2021}
}
@inproceedings{faucris.110064284,
author = {Scheiner, Benedict and Mann, Sebastian and Lurz, Fabian and Michler, Fabian and Erhardt, Stefan and Lindner, Stefan and Weigel, Robert and Kölpin, Alexander},
booktitle = {Radio and Wireless Symposium (RWS), 2018 IEEE},
date = {2018-01-14/2018-01-17},
doi = {10.1109/RWS.2018.8304934},
faupublication = {yes},
month = {Jan},
pages = {18-20},
peerreviewed = {Yes},
publisher = {IEEE},
title = {{Microstrip}-to-{Waveguide} {Transition} in {Planar} {Form} {Using} a {Substrate} {Integrated} {Waveguide}},
venue = {Anaheim, CA},
year = {2018}
}
@article{faucris.120389104,
author = {Lurz, Fabian and Michler, Fabian and Scheiner, Benedict and Weigel, Robert and Kölpin, Alexander},
doi = {10.1109/MMM.2017.2759640},
faupublication = {yes},
journal = {IEEE Microwave Magazine},
month = {Jan},
pages = {91-98},
peerreviewed = {Yes},
title = {{Microw}(h)att?! {Ultralow}-{Power} {Six}-{Port} {Radar}},
volume = {19},
year = {2018}
}
@article{faucris.253041901,
author = {Scheiner, Benedict and Probst, Florian and Michler, Fabian and Weigel, Robert and Kölpin, Alexander and Lurz, Fabian},
doi = {10.3390/s21072367},
faupublication = {yes},
journal = {Sensors},
peerreviewed = {Yes},
title = {{Miniaturized} {Hybrid} {Frequency} {Reader} for {Contactless} {Measurement} {Scenarios} {Using} {Resonant} {Surface} {Acoustic} {Wave} {Sensors}},
url = {https://www.mdpi.com/1424-8220/21/7/2367},
year = {2021}
}
@article{faucris.225573836,
author = {Hassan, Emadeldeen and Scheiner, Benedict and Michler, Fabian and Berggren, Martin and Wadbro, Eddie and Röhrl, Franz Xaver and Zorn, Stefan and Weigel, Robert and Lurz, Fabian},
doi = {10.1109/TMTT.2019.2959759},
faupublication = {yes},
journal = {IEEE Transactions on Microwave Theory and Techniques},
pages = {1326 - 1339},
peerreviewed = {Yes},
title = {{Multilayer} {Topology} {Optimization} of {Wideband} {SIW}-to-{Waveguide} {Transitions}},
volume = {68},
year = {2020}
}
@inproceedings{faucris.107042364,
author = {Malessa, Anke and Steigleder, Tobias and Shi, Kilin and Will, Christoph and Michler, Fabian and Kölpin, Alexander and Ostgathe, Christoph},
booktitle = {Wissenschaftliche Arbeitstage der DGP},
date = {2018-03-09/2018-03-10},
faupublication = {yes},
peerreviewed = {Yes},
title = {{Neue} {Wege} in der {Palliativmedizin} – {Herausforderungen} bei der {Entwicklung} einer berührungslosen, nicht-belastenden {Messung} von {Vitalparametern}},
venue = {Göttingen},
year = {2018}
}
@inproceedings{faucris.268727314,
abstract = {Six-port-based continuous-wave radar systems have been used for vibration analysis in predictive maintenance and vital sign sensing applications. A core component of these systems are microwave power detectors used for for the down-conversion. This paper investigates a passive Schottky diode detector regarding its noise behavior. Therefore diode noise measurements are presented to estimate the unknown flicker noise parameters. Based on the derived detector noise behavior, the theoretical limit of the precision of the 24GHz continuous-wave radar system is derived and compared to measurements. A measurement precision of 1µm could be achieved at a baseband bandwidth of 100Hz and a target distance of 1m.
},
author = {Will, Christoph and Shi, Kilin and Schellenberger, Sven and Steigleder, Tobias and Michler, Fabian and Fuchs, Jonas and Weigel, Robert and Ostgathe, Christoph and Kölpin, Alexander},
doi = {10.1038/s41598-018-29984-5},
faupublication = {yes},
journal = {Scientific Reports},
peerreviewed = {Yes},
title = {{Radar}-{Based} {Heart} {Sound} {Detection}},
year = {2018}
}
@inproceedings{faucris.211576389,
abstract = {The continuous measurement of human vital parameters is an important diagnostic tool in human medicine. Conventional measurement devices, such as the electrocardiograph (ECG) or the photoplethysmograph (PPG), require a direct contact to the patients, limiting their independence and mobility. These drawbacks can be overcome by using high-precision radar systems for a contactless monitoring of the patients. In this talk, the physiological parameters of interest, respiration and heartbeat and related diagnostic parameters, such as heartsounds and pulse wave propagation will be introduced. In the next step, their impact on the movement of the body surface will be derived. A suitable concept for a highly precise radar system combined with state-of-the-art algorithms will be presented, which is able to measure the required relative displacements of the patient’s skin. As proof of concept, the measurement results of a medical proband study will be shown and discussed in detail. This also includes a possible medical evaluation of the sensed parameters and an outlook on potential areas of application for the proposed systems.
Using a 24 GHz bistatic radar, a fast presence detection based on a support vector machine (SVM) classifer is realized. Large body motions or even small distance deviations, such as movement of the chest induced by heartbeat or breathing, are distinguishable from the measured noise of an unoccupied bed. For classifcation two features are calculated based on windowed I and Q data. Performance is evaluated by varying window sizes from 0.2 ... 1.5 s for feature calculation and training of the SVM classifer. In the resting scenario an accuracy of 99.2% and F1-score of 99.1% with windows of 0.2 s is achieved.