Staff

M. Sc. Christoph Will

Contact

About Christoph Will

Curriculum Vitae

M. Sc. Christoph Will finished his studies with honors in information and communication technology (focus Realization of ICT Systems) at the FAU Erlangen-Nuremberg in April 2014. Since June 2014 he has been employed as a research assistant at the Institute for Electronics Engineering and is part of the Circuits, Systems & Hardware Test (CST) team. He is currently working towards his PhD in the field of signal processing for radar systems.

Fields of Activity

  • Analog and digital circuit design
  • Radar signal processing
  • Frequency estimation

Open Theses

Feel free to contact me via e-mail if you are interested in the topics mentioned above.

Awards

  • A. Koelpin, F. Lurz, S. Linz, S. Mann, C. Will, and S. Lindner, Preis der ITG 2017, Informationstechnische Gesellschaft im VDE (ITG), 2017. [Bibtex]
    @prize{koelpin_prize_2017,
    abstract = {Preis der ITG 2017 für die Publikation „Six-Port Based Interferometry for Precise Radar and Sensing Applications“},
    author = {Koelpin, Alexander and Lurz, Fabian and Linz, Sarah and Mann, Sebastian and Will, Christoph and Lindner, Stefan},
    booktitle = {Informationstechnische Gesellschaft im VDE (ITG)},
    cris = {koelpin_prize_2017},
    year = {2017},
    month = {11},
    day = {27},
    title = {Preis der ITG 2017},
    type = {20773-Kleiner Preis},
    }
  • C. Will, Förderung einer Kongressreise (APMC2017), Deutscher Akademischer Austauschdienst, 2017. [Bibtex]
    @prize{will_prize_2017,
    author = {Will, Christoph},
    booktitle = {Deutscher Akademischer Austauschdienst},
    cris = {will_prize_2017},
    year = {2017},
    month = {11},
    day = {13},
    title = {Förderung einer Kongressreise (APMC2017)},
    type = {20773-Kleiner Preis},
    }
  • C. Will, S. Linz, S. Mann, F. Lurz, S. Lindner, R. Weigel, and A. Koelpin, Second Prize Student Paper Competition, IEEE Radio and Wireless Week, 2017. [Bibtex]
    @prize{will_prize2017,
    abstract = {For the paper "Segmental Polynomial Approximation based phase error correction for precise near field displacement measurements using six-port microwave interferometers},
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE Radio and Wireless Week},
    cris = {will_prize2017},
    year = {2017},
    month = {01},
    day = {18},
    title = {Second Prize Student Paper Competition},
    type = {20773-Kleiner Preis},
    }
  • C. Will, F. Lurz, K. Shi, R. Weigel, and A. Koelpin, Excellent Demo Track Presentation, Radio and Wireless Week, 2016. [Bibtex]
    @prize{will_prize_2016,
    abstract = {For an exemplary demonstration of: Android-based Real Time Heartbeat Detection Using a Microwave Radar},
    author = {Will, Christoph and Lurz, Fabian and Shi, Kilin and Weigel, Robert and Koelpin, Alexander},
    booktitle = {Radio and Wireless Week},
    cris = {will_prize_2016},
    year = {2016},
    month = {01},
    day = {25},
    title = {Excellent Demo Track Presentation},
    type = {20773-Kleiner Preis},
    }
  • C. Will, Förderung einer Kongressreise (WiSNet2016), Deutscher Akademischer Austauschdienst, 2016. [Bibtex]
    @prize{will_prize_2016a,
    abstract = {Förderung einer Kongressreise anlässlich der Wisnet2016 in Austin, Texas, USA},
    author = {Will, Christoph},
    booktitle = {Deutscher Akademischer Austauschdienst},
    cris = {will_prize_2016a},
    year = {2016},
    month = {01},
    day = {24},
    title = {Förderung einer Kongressreise (WiSNet2016)},
    type = {20773-Kleiner Preis},
    }
  • C. Will, Master-Preis der Siemens Corporate Technology, Technische Fakultät der Friedrich-Alexander-Universität Erlangen-Nürnberg, 2014. [Bibtex]
    @prize{will_prize_2014,
    abstract = {Für hervorragende Prüfungsleistungen},
    author = {Will, Christoph},
    booktitle = {Technische Fakultät der Friedrich-Alexander-Universität Erlangen-Nürnberg},
    cris = {will_prize_2014},
    year = {2014},
    month = {07},
    day = {04},
    title = {Master-Preis der Siemens Corporate Technology},
    type = {20773-Kleiner Preis},
    }

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Publications

2018

  • C. Will, K. Shi, S. Schellenberger, T. Steigleder, F. Michler, J. Fuchs, R. Weigel, C. Ostgathe, and A. Koelpin, "Radar-Based Heart Sound Detection", Scientific Reports, 2018. [DOI] [Bibtex]
    @article{will2018,
    abstract = {This paper introduces heart sound detection by radar systems, which enables touch-free and continuous monitoring of heart sounds. The proposed measurement principle entails two enhancements in modern vital sign monitoring. First, common touch-based auscultation with a phonocardiograph can be simplified by using biomedical radar systems. Second, detecting heart sounds offers a further feasibility in radar-based heartbeat monitoring. To analyse the performance of the proposed measurement principle, 9930 seconds of eleven persons-under-tests' vital signs were acquired and stored in a database using multiple, synchronised sensors: a continuous wave radar system, a phonocardiograph (PCG), an electrocardiograph (ECG), and a temperature-based respiration sensor. A hidden semi-Markov model is utilised to detect the heart sounds in the phonocardiograph and radar data and additionally, an advanced template matching (ATM) algorithm is used for state-of-the-art radar-based heartbeat detection. The feasibility of the proposed measurement principle is shown by a morphology analysis between the data acquired by radar and PCG for the dominant heart sounds S1 and S2: The correlation is 82.97 ± 11.15% for 5274 used occurrences of S1 and 80.72 ± 12.16% for 5277 used occurrences of S2. The performance of the proposed detection method is evaluated by comparing the F-scores for radar and PCG-based heart sound detection with ECG as reference: Achieving an F1 value of 92.22 ± 2.07%, the radar system approximates the score of 94.15 ± 1.61% for the PCG. The accuracy regarding the detection timing of heartbeat occurrences is analysed by means of the root-mean-square error: In comparison to the ATM algorithm (144.9 ms) and the PCG-based variant (59.4 ms), the proposed method has the lowest error value (44.2 ms). Based on these results, utilising the detected heart sounds considerably improves radar-based heartbeat monitoring, while the achieved performance is also competitive to phonocardiography.
    }, 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 Koelpin, Alexander}, cris = {https://cris.fau.de/converis/publicweb/publication/202373734}, year = {2018}, month = {07}, day = {26}, doi = {10.1038/S41598-018-29984-5}, faupublication = {yes}, issn = {2045-2322}, journaltitle = {Scientific Reports}, peerreviewed = {Yes}, title = {Radar-Based Heart Sound Detection}, type = {Report}, url = {https://www.nature.com/articles/s41598-018-29984-5}, }
  • K. Shi, C. Will, R. Weigel, and A. Koelpin, "Contactless Person Identification Using Cardiac Radar Signals" in 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Houston, Texas, USA, 2018. [DOI] [Bibtex]
    @inproceedings{shi2018a,
    abstract = {Radar systems have been researched for the use of presence detection and contactless vital sign monitoring. However, there exists no established biometrics for remote and unique person identification during such monitoring. Conventional biometrics like fingerprint or iris scan yield the disadvantage that direct contact with the person is needed. This paper explores the possibility of using cardiac radar signals as new biometric parameter for unique person identification. Measurements on different persons are performed using a 24GHz continuous wave radar system which utilizes the Six-Port technology. An advanced signal processing and classification routine is presented to perform automatic person identification. Among several classifiers, quadratic support vector machines achieve the best performance and reach an overall accuracy of up to 94.6%.},
    author = {Shi, Kilin and Will, Christoph and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    booktitle = {2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/107873964},
    year = {2018},
    month = {05},
    day = {14},
    doi = {10.1109/I2MTC.2018.8409645},
    eventdate = {2018-05-14/2018-05-17},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Contactless Person Identification Using Cardiac Radar Signals},
    type = {Konferenzschrift},
    venue = {Houston, Texas, USA},
    }
  • K. Shi, C. Will, T. Steigleder, F. Michler, R. Weigel, C. Ostgathe, and A. Koelpin, "A Contactless System for Continuous Vital Sign Monitoring in Palliative and Intensive Care" in 2018 Annual IEEE International Systems Conference (SysCon), Vancouver, Kanada, Canada, 2018. [DOI] [Bibtex]
    @inproceedings{shi2018,
    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 achieved.},
    author = {Shi, Kilin and Will, Christoph and Steigleder, Tobias and Michler, Fabian and Weigel, Robert and Ostgathe, Christoph and Koelpin, Alexander},
    language = {English},
    booktitle = {2018 Annual IEEE International Systems Conference (SysCon)},
    cris = {https://cris.fau.de/converis/publicweb/publication/106234964},
    year = {2018},
    month = {04},
    day = {23},
    doi = {10.1109/SYSCON.2018.8369507},
    eventdate = {2018-04-23/2018-04-26},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {A Contactless System for Continuous Vital Sign Monitoring in Palliative and Intensive Care},
    type = {Konferenzschrift},
    venue = {Vancouver, Kanada, Canada},
    }
  • S. Mann, C. Will, T. Reißland, F. Lurz, S. Lindner, S. Linz, R. Weigel, and A. Koelpin, "High-Precision Interferometric Radar for Sheet Thickness Monitoring", IEEE Transactions on Microwave Theory and Techniques, vol. 66, iss. 6, pp. 3153-3166, 2018. [DOI] [Bibtex]
    @article{mann2018,
    abstract = {Contact-less sensing plays an important role in today’s highly automated industrial environment, as modern sensors allow for an increased product quality in high-speed manufacturing lines. Hereby, a measurement system for sheet thickness monitoring in aluminum and steel rolling mills is presented. The presented concept is based on a differential measurement principle using two cooperating six-port radar systems. The radio frequency front-ends are designed in a high density substrate integrated waveguide technology at a frequency of 61 GHz. Furthermore, a detailed analysis of non-ideal behavior of mono-static six-port radar front-ends is presented. Moreover, the measurement principle is evaluated in a simplified measurement setup and the results are compared to previously presented theory. Finally, an overview of modern sensing technology for steel rolling mills is presented and compared to the proposed measurement system considering the important aspects, i.e. update rate, precision, and thickness limit.},
    author = {Mann, Sebastian and Will, Christoph and Reißland, Torsten and Lurz, Fabian and Lindner, Stefan and Linz, Sarah and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    cris = {https://cris.fau.de/converis/publicweb/publication/118145544},
    year = {2018},
    month = {04},
    day = {20},
    doi = {10.1109/TMTT.2018.2825328},
    faupublication = {yes},
    issn = {0018-9480},
    journaltitle = {IEEE Transactions on Microwave Theory and Techniques},
    keywords = {radar systems,interferometry,six-port circuits,microwave circuits,substrate integrated waveguide (SIW),planar waveguides},
    number = {6},
    pages = {3153--3166},
    peerreviewed = {Yes},
    shortjournal = {IEEE T MICROW THEORY},
    title = {High-Precision Interferometric Radar for Sheet Thickness Monitoring},
    type = {Article in Journal},
    volume = {66},
    }
  • A. Malessa, T. Steigleder, K. Shi, C. Will, F. Michler, A. Koelpin, and C. Ostgathe, "Neue Wege in der Palliativmedizin – Herausforderungen bei der Entwicklung einer berührungslosen, nicht-belastenden Messung von Vitalparametern" in Wissenschaftliche Arbeitstage der DGP, Göttingen, Germany, 2018. [Bibtex]
    @inproceedings{malessa2018,
    author = {Malessa, Anke and Steigleder, Tobias and Shi, Kilin and Will, Christoph and Michler, Fabian and Koelpin, Alexander and Ostgathe, Christoph},
    language = {German},
    booktitle = {Wissenschaftliche Arbeitstage der DGP},
    cris = {https://cris.fau.de/converis/publicweb/publication/107042364},
    year = {2018},
    month = {03},
    day = {09},
    eventdate = {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},
    type = {Konferenzschrift},
    venue = {Göttingen, Germany},
    }

2017

  • C. Will, S. Mann, F. Michler, T. Reißland, F. Lurz, R. Weigel, and A. Koelpin, "Error Compensation of the Temperature Influence on Radar based Displacement Measurements" in 2017 IEEE Asia Pacific Microwave Conference (APMC), Kuala Lumpur, Malaysia, 2017, pp. 89-92. [DOI] [Bibtex]
    @inproceedings{will2017c,
    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 Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {2017 IEEE Asia Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/108238064},
    year = {2017},
    month = {11},
    day = {13},
    doi = {10.1109/APMC.2017.8251384},
    eventdate = {2017-11-13/2017-11-16},
    eventtitle = {IEEE Asia Pacific Microwave Conference (APMC)},
    faupublication = {yes},
    pages = {89--92},
    peerreviewed = {Yes},
    title = {Error Compensation of the Temperature Influence on Radar based Displacement Measurements},
    type = {Konferenzschrift},
    venue = {Kuala Lumpur, Malaysia},
    }
  • C. Will, S. Linz, S. Mann, F. Lurz, S. Lindner, R. Weigel, and A. Koelpin, "A 24 GHz Waveguide based Radar System using an Advanced Algorithm for I/Q Offset Cancelation", Advances in Radio Science, vol. Kleinheubacher Berichte 2016, iss. 15, 2017. [DOI] [Bibtex]
    @article{will2017d,
    abstract = {Precise position measurement with micrometer accuracy plays an important role in modern industrial applications. Herewith, a guided wave Six-Port interferometric radar system is presented. Due to limited matching and discontinuities in the radio frequency (RF) part of the system, the designers have to deal with DC offsets. The offset voltages in the baseband lead to worse relative modulation dynamics relating to the full scale range of the analog-to-digital converters and~ thus, considerably degrade the system performance. While common cancelation techniques try to estimate and extinguish the DC offsets directly, the proposed radar system is satisfied with equalizing both DC offsets for each of the two differential baseband signal pairs. Since the complex representation of the baseband signals is utilized for a subsequent arctangent demodulation, the proposed offset equalization implicates a centering of the in-phase and quadrature (I/Q) components of the received signal, which is sufficient to simplify the demodulation and improve the phase accuracy. Therefore, a standard Six-Port radar system is extended and a variable phase shifter plus variable attenuators are inserted at different positions. An intelligent algorithm adjusts these configurable components to achieve optimal I/Q offset cancelation.},
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    cris = {https://cris.fau.de/converis/publicweb/publication/108439584},
    year = {2017},
    month = {10},
    day = {25},
    doi = {10.5194/ARS-15-249-2017},
    faupublication = {yes},
    issn = {1684-9973},
    journaltitle = {Advances in Radio Science},
    number = {15},
    peerreviewed = {unknown},
    series = {Advances in Radio Science},
    title = {A 24 GHz Waveguide based Radar System using an Advanced Algorithm for I/Q Offset Cancelation},
    volume = {Kleinheubacher Berichte 2016},
    }
  • C. Will, K. Shi, S. Schellenberger, T. Steigleder, F. Michler, R. Weigel, C. Ostgathe, and A. Koelpin, "Local Pulse Wave Detection using Continuous Wave Radar Systems", IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology, vol. 1, iss. 2, pp. 81-89, 2017. [DOI] [Bibtex]
    @article{will2017e,
    author = {Will, Christoph and Shi, Kilin and Schellenberger, Sven and Steigleder, Tobias and Michler, Fabian and Weigel, Robert and Ostgathe, Christoph and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology},
    cris = {https://cris.fau.de/converis/publicweb/publication/123402224},
    year = {2017},
    month = {10},
    day = {27},
    doi = {10.1109/JERM.2017.2766567},
    faupublication = {yes},
    issn = {2469-7249},
    journaltitle = {IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology},
    number = {2},
    pages = {81--89},
    peerreviewed = {Yes},
    title = {Local Pulse Wave Detection using Continuous Wave Radar Systems},
    volume = {1},
    }
  • C. Will, M. Sporer, N. Sebald, J. Fuchs, R. Weigel, and A. Koelpin, "Radarbasiertes Structural Health Monitoring der Rotorblätter von Windkaftanlagen" in Kleinheubacher Tagung, Miltenberg, Germany, 2017. [Bibtex]
    @inproceedings{will2017b,
    author = {Will, Christoph and Sporer, Michael and Sebald, Nina and Fuchs, Jonas and Weigel, Robert and Koelpin, Alexander},
    publisher = {URSI},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/123490664},
    year = {2017},
    month = {09},
    day = {25},
    eventdate = {2017-09-25/2017-09-27},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Radarbasiertes Structural Health Monitoring der Rotorblätter von Windkaftanlagen},
    type = {Abstract zum Vortrag},
    venue = {Miltenberg, Germany},
    }
  • C. Will, K. Shi, R. Weigel, and A. Koelpin, "Advanced Template Matching Algorithm for Instantaneous Heartbeat Detection using Continuous Wave Radar Systems" in IEEE MTT-S International Microwave Bio Conference (IMBioC), Gothenburg, Sweden, 2017. [DOI] [Bibtex]
    @inproceedings{will2017a,
    abstract = {Instantaneous heartbeat detection is a key parameter in modern vital sign monitoring. Continuous wave (CW) radar systems enable contactless measurements of the vibrations on the human skin effected by heartbeats. Since a high accuracy as well as robustness of the measurement sensor is appreciated, the belonging signal processing routine has to deal with challenging requirements. In this paper, an advanced template matching (ATM) algorithm is proposed to enhance the performance regarding instantaneous heartbeat detection using CW radar systems. Compared to common template matching algorithms, multiple heterogeneous templates are utilized in this approach, at which the appropriate template type is determined by prior feature detection. A 24 Ghz Six-Port microwave interferometer is used for vital sign measurements of a person-under-test. The functionality of the proposed algorithm is verified by a synchronous reference electrocardiogram (ECG) and its enhancement is shown by reducing the root-mean-square error (RMSE) of the interbeat intervals (IBI) compared to an ordinary template matching algorithm.},
    author = {Will, Christoph and Shi, Kilin and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Microwave Bio Conference (IMBioC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/123056824},
    year = {2017},
    month = {05},
    day = {15},
    doi = {10.1109/IMBIOC.2017.7965797},
    eventdate = {2017-05-15/2017-05-17},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Advanced Template Matching Algorithm for Instantaneous Heartbeat Detection using Continuous Wave Radar Systems},
    type = {Konferenzschrift},
    venue = {Gothenburg, Sweden},
    }
  • S. Linz, C. Will, F. Lurz, S. Lindner, S. Mann, R. Schober, R. Weigel, and A. Koelpin, "Detector Nonlinearity in Six-Port Radar" in IEEE Topical Conference on Wireless Sensors and Sensor Networks, Phoenix, AZ, USA, 2017, pp. 19-22. [DOI] [Bibtex]
    @inproceedings{linz2017,
    abstract = {This paper presents an in-situ detector characterization and calibration method for differential I/Q Sixport radar systems. A separate calibration of the nonlinear detectors and the linear Six-port front-end enables an independent analysis of errors caused by detector nonlinearity and by the measurement scenario. A linearity analysis of various detectors in Six-port radar systems shows the necessity of a detector calibration for accurate displacement measurements. The calibration is evaluated with three different Six-port front-ends at 24 GHz in divers measurement scenarios. An error reduction of up to 50% has been achieved.},
    author = {Linz, Sarah and Will, Christoph and Lurz, Fabian and Lindner, Stefan and Mann, Sebastian and Schober, Robert and Weigel, Robert and Koelpin, Alexander},
    language = {English},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks},
    cris = {https://cris.fau.de/converis/publicweb/publication/120065044},
    year = {2017},
    month = {01},
    day = {15},
    doi = {10.1109/WISNET.2017.7878745},
    eventdate = {2017-01-15/2017-01-18},
    faupublication = {yes},
    pages = {19--22},
    peerreviewed = {Yes},
    title = {Detector Nonlinearity in Six-Port Radar},
    type = {Konferenzschrift},
    venue = {Phoenix, AZ, USA},
    }
  • C. Will, S. Linz, S. Mann, F. Lurz, S. Lindner, R. Weigel, and A. Koelpin, "Segmental Polynomial Approximation based Phase Error Correction for Precise Near Field Displacement Measurements using Six-Port Microwave Interferometers" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), Phoenix, AZ, USA, 2017. [DOI] [Bibtex]
    @inproceedings{will2017,
    abstract = {Six-Port microwave interferometers are a lowcost as well as low-power type of radar sensor with a high phase accuracy, which can be used for precise displacement measurements. Near field effects strongly influence the signal characteristics of a reflection of the electromagnetic wave near the antenna, especially if the target is low reflective. In this paper a calibration procedure based on phase error correction by segmental polynomial approximation is proposed that utilizes these effects. After validating the functionality of the calibration algorithm and its improvement by comparison to a comparable state-of-the-art procedure, two further near field measurements are presented. A cardboard as well as a plastic plate are used as low reflecting targets to show the applicability of the proposed calibration procedure for diverse measurement scenarios.},
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/108238504},
    year = {2017},
    month = {01},
    day = {15},
    doi = {10.1109/WISNET.2017.7878746},
    eventdate = {2017-01-15/2017-01-18},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Segmental Polynomial Approximation based Phase Error Correction for Precise Near Field Displacement Measurements using Six-Port Microwave Interferometers},
    type = {Konferenzschrift},
    venue = {Phoenix, AZ, USA},
    }

2016

  • A. Koelpin, F. Lurz, S. Linz, S. Mann, C. Will, and S. Lindner, "Six-Port Based Interferometry for Precise Radar and Sensing Application", Sensors, vol. 16, iss. 10, pp. 1-26, 2016. [DOI] [Bibtex]
    @article{koelpin2016,
    author = {Koelpin, Alexander and Lurz, Fabian and Linz, Sarah and Mann, Sebastian and Will, Christoph and Lindner, Stefan},
    publisher = {MDPI},
    cris = {https://cris.fau.de/converis/publicweb/publication/108125864},
    year = {2016},
    month = {09},
    doi = {10.3390/S16101556},
    faupublication = {yes},
    issn = {1424-8220},
    journaltitle = {Sensors},
    number = {10},
    pages = {1--26},
    peerreviewed = {Yes},
    shortjournal = {SENSORS-BASEL},
    title = {Six-Port Based Interferometry for Precise Radar and Sensing Application},
    volume = {16},
    }
  • C. Will, S. Linz, S. Mann, F. Lurz, S. Lindner, R. Weigel, and A. Koelpin, "A 24 GHz Waveguide based Radar System using an Advanced Algorithm for I/Q Offset Cancelation" in Kleinheubacher Tagung, Miltenberg, Germany, 2016. [Bibtex]
    @inproceedings{will2016a,
    author = {Will, Christoph and Linz, Sarah and Mann, Sebastian and Lurz, Fabian and Lindner, Stefan and Weigel, Robert and Koelpin, Alexander},
    publisher = {URSI},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/108121244},
    year = {2016},
    month = {09},
    day = {26},
    eventdate = {2016-09-26/2016-09-28},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {A 24 GHz Waveguide based Radar System using an Advanced Algorithm for I/Q Offset Cancelation},
    type = {Abstract zum Vortrag},
    venue = {Miltenberg, Germany},
    }
  • S. Mann, F. Lurz, S. Linz, S. Lindner, C. Will, S. Wibbing, R. Weigel, and A. Koelpin, "Substrate Integrated Waveguide Fed Antenna for 61 GHz Ultra-Short-Range Interferometric Radar Systems" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), Austin, TX, USA, 2016, pp. 64-66. [DOI] [Bibtex]
    @inproceedings{mann2016,
    abstract = {Radar sensors play a key role in today’s indus- trial automation. Being an alternative to frequency modulated continuous wave radar, Six-Port based radar sensors recently attracted the interest of the community as well as of the industry. This paper presents a 61 GHz Six-Port radar sensor for ultra-short range applications and a dedicated substrate integrate waveguide fed tapered slot antenna design. Due to an optimized design, the antenna allows for measurements in the direct near-zone of 0 mm to 10 mm without ambiguity effects. Making use of a spiral fitting operation, the presented measurement results show an absolute distance error of less than 100 µm.},
    author = {Mann, Sebastian and Lurz, Fabian and Linz, Sarah and Lindner, Stefan and Will, Christoph and Wibbing, Sascha and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/108672564},
    year = {2016},
    month = {01},
    day = {24},
    doi = {10.1109/WISNET.2016.7444323},
    eventdate = {2016-01-24/2016-01-27},
    faupublication = {yes},
    keywords = {Interferometer; Six-Port; RADAR; phase measurement; nearfield sensor; millimeter-wave},
    number = {66},
    pages = {64--66},
    peerreviewed = {Yes},
    title = {Substrate Integrated Waveguide Fed Antenna for 61 GHz Ultra-Short-Range Interferometric Radar Systems},
    venue = {Austin, TX, USA},
    volume = {64},
    }
  • C. Will, K. Shi, F. Lurz, R. Weigel, and A. Koelpin, "Instantaneous Heartbeat Detection using a Cross-Correlation based Template Matching for Continuous Wave Radar Systems" in IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet), Austin, TX, USA, 2016, pp. 31-34. [DOI] [Bibtex]
    @inproceedings{will2016,
    abstract = {Instantaneous heartbeat detection is necessary for an optimal patient monitoring in healthcare centers. Whereas electrocardiogram (ECG) and ballistocardiogram (BCG), for instance, are established methods for real time monitoring nowadays, contact-free systems are appreciated. Herewith, a 24 GHz continuous wave (CW) radar system with an intelligent signal processing is presented. Common heartbeat detection algorithms use the fast Fourier transform (FFT), and therefore require an adequate observation time window and rather detect an averaged heart rate. The proposed algorithm in contrast accomplishes the detection of single heart beats directly in the time domain with an insignificant delay. The core of that algorithm is a template matching using the cross-correlation method. In this paper, after describing the radar system with the novel signal processing, the presented system is compared to a commercial ECG product.},
    author = {Will, Christoph and Shi, Kilin and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNet)},
    cris = {https://cris.fau.de/converis/publicweb/publication/108087804},
    year = {2016},
    month = {01},
    day = {24},
    doi = {10.1109/WISNET.2016.7444314},
    eventdate = {2016-01-24/2016-01-27},
    faupublication = {yes},
    keywords = {Radar interferometry; Biomedical signal processing; Template matching},
    pages = {31--34},
    peerreviewed = {Yes},
    title = {Instantaneous Heartbeat Detection using a Cross-Correlation based Template Matching for Continuous Wave Radar Systems},
    venue = {Austin, TX, USA},
    }

2015

  • C. Will, K. Shi, F. Lurz, R. Weigel, and A. Koelpin, "Intelligent Signal Processing Routine for Instantaneous Heart Rate Detection using a Six-Port Microwave Interferometer" in IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), Nusa Dua, Bali, Indonesia, 2015, pp. 483-487. [DOI] [Bibtex]
    @inproceedings{will2015,
    abstract = {Instantaneous heart rate detection is one of the key parameters in medical vital parameter monitoring. In medical centers e.g., real time monitoring of the vital signs of a patient under surveillance is necessary. Nowadays, the dominant technologies are electrocardiogram (ECG) or ballistocardiogram (BCG), but the required direct contact to the person-under-surveillance is a common drawback of these sensors. In this paper, a Six-Port microwave interferometer is presented and used to detect the current heart rate of a person-under-test. An intelligent signal processing routing is proposed, that avoids the fast Fourier transform (FFT) due to the implicated longsome observation window and operates directly in the time domain instead. A commercial ECG product is used to proof the reliability of the presented signal processing routine to establish Six-Port microwave interferometers for instantaneous heart rate detection.},
    author = {Will, Christoph and Shi, Kilin and Lurz, Fabian and Weigel, Robert and Koelpin, Alexander},
    booktitle = {IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/124139884},
    year = {2015},
    month = {11},
    day = {09},
    doi = {10.1109/ISPACS.2015.7432820},
    eventdate = {2015-11-09/2015-11-12},
    faupublication = {yes},
    keywords = {Six-Port; Interferometers; Biomedical signal processing; Heartbeat monitoring},
    pages = {483--487},
    peerreviewed = {Yes},
    title = {Intelligent Signal Processing Routine for Instantaneous Heart Rate Detection using a Six-Port Microwave Interferometer},
    venue = {Nusa Dua, Bali, Indonesia},
    }
  • G. Vinci, T. Lenhard, C. Will, and A. Koelpin, "Microwave Interferometer Radar-Based Vital Sign Detection for Driver Monitoring Systems" in IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM), Heidelberg, Germany, 2015. [DOI] [Bibtex]
    @inproceedings{vinci2015,
    abstract = {Autonomous driving is a topic of great importance for our society and is expected to be introduced in the automotive market in a couple of decades. Today, vehicles can already autonomously brake and accelerate in order to avoid crashes with obstacles detected by camera and radar technology. The next step towards autonomous driving is the introduction of driver health monitoring systems. Intensive research is being conducted in this field with the goal of developing a ”biometric driver seat”. In this paper, an interferometric radar-based vital sign detection is presented. The aim is to investigate the applicability of radar technology for vital sign monitoring such as heartbeat and breath rate of the driver with sensors embedded in the seat. The proposed interferometric radar is based on the Six-Port receiver technique and shows excellent performance for the addressed application.},
    author = {Vinci, Gabor and Lenhard, Thilo and Will, Christoph and Koelpin, Alexander},
    publisher = {IEEE},
    booktitle = {IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM)},
    cris = {https://cris.fau.de/converis/publicweb/publication/108062064},
    year = {2015},
    month = {04},
    doi = {10.1109/ICMIM.2015.7117940},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Microwave Interferometer Radar-Based Vital Sign Detection for Driver Monitoring Systems},
    type = {Konferenzschrift},
    venue = {Heidelberg, Germany},
    }

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