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Christian Waldschmidt
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Academic Career Length
23Years (2004-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications11 January 2021 in IEEE Journal of Microwaves
Journal Article
CWChristian Waldschmidt
Christian WaldschmidtJHJuergen Hasch
Juergen HaschWMWolfgang Menzel
Wolfgang MenzelAlthough the beginning of research on automotive radar sensors goes back to the 1960s, automotive radar has remained one of the main drivers of innovation in millimeter wave technology over the past two decades. Today, millions of sensors are produced each year, which was made possible by inexpensive and mature millimeter wave technology. The technology maturity, in turn, enables research to be carried out on systems that are considerably more complex and powerful than was possible just a few years ago. The focus of research has thus shifted from purely hardware-oriented and device-level topics to sophisticated millimeter wave systems and RF signal processing topics. This opens up new research topics such as digital modulation schemes, radar networks, radar imaging, and machine learning. In this review paper, we sketch the path from the very beginning through the state of the art with sophisticated multiple-input multiple-output (MIMO) antenna arrays and mature assembly and interconnect concepts to today's key research topics of automotive radar.
23 September 2022 in IEEE Journal of Microwaves
Journal Article
TCTobias Chaloun
Tobias ChalounLBLuigi Boccia
Luigi Boccia
emilio arnieriMFMichael Fischer
Michael FischerVVVaclav Valenta
Vaclav Valenta
CWChristian Waldschmidt
Christian Waldschmidt +1
Satellite, fifth generation (5G), and sixth generation (6G) mobile communication systems operating at micro- and millimeter wave frequencies are an essential pillar in advanced network architectures for high-throughput low latency services. The decisive factors for this current development were the significant technological advances accomplished over the last two decades, which meanwhile enable highly integrated, feature-rich, and cost-effective realizations of complete phased array transceiver topologies. Motivated through the today's trend for heterogeneous constellation types to provide truly global coverage, this contribution reviews the current state-of-the-art of electronically steerable antennas for terrestrial and non-terrestrial communication systems up to 100 GHz. First, the potential benefits and limitations of the most relevant technologies are contrasted and put into context with recent system architectures for adaptive beamforming. Their operating principles along with various experimental implementation and achievements providing advanced capabilities such as multi-band/multi-beam operation, polarization agility, and wide-angle scanning are thoroughly presented. Particular emphasis is laid on the review of direct radiating arrays, quasi-optical antenna configurations, and metasurface-based antennas.
12 October 2018 in IEEE Microwave Magazine
Journal Article
PHPhilipp Hugler
Philipp Hugler
FRFabian Roos
Fabian RoosMSMarkus Schartel
Markus Schartel
MGMartin Geiger
Martin GeigerCWChristian Waldschmidt
Christian WaldschmidtModern consumer and industrial unmanned aerial vehicles (UAVs) are easy-to-use flying sensor platforms. They offer stable flight, good maneuverability, hovering, and even waypoint flights in autopilot mode. For stabilization and localization, sensors such as inertial measurement units (IMUs)-including gyroscopes and accelerometers-barometric sensors, and the Global Navigation Satellite System (GNSS) are used. To sense the UAV?s direct environment, e.g., for collision avoidance or fully automated flight, additional sensors are needed. State-of-the-art combinations of infrared, ultrasonic, and vision-based sensors (monocular and/or stereo vision) capture the close vicinity. Using radar sensors is advantageous, as they are able to directly sense range and velocity and are not affected by lighting conditions and contrast. With the help of a multichannel radar, the angular information may also be extracted.
1 October 2017
Conference Paper
JBJonathan Bechter
Jonathan Bechter
FRFabian Roos
Fabian Roos
MRMahfuzur Rahman
Mahfuzur Rahman
CWChristian Waldschmidt
Christian Waldschmidt25 May 2020 in IEEE Antennas and Propagation Magazine
Journal Article
CVClaudia Vasanelli
Claudia Vasanelli
FRFabian Roos
Fabian RoosADAndre Durr
Andre DurrJSJohannes Schlichenmaier
Johannes SchlichenmaierPHPhilipp Hugler
Philipp HuglerCWChristian Waldschmidt
Christian Waldschmidt +2
4 March 2020 in IEEE Transactions on Antennas and Propagation
Journal Article
ASAdolfo Di Serio
Adolfo Di SerioPHPhilipp Hugler
Philipp HuglerFRFabian Roos
Fabian RoosCWChristian Waldschmidt
Christian WaldschmidtIn this paper, a method for the assessment of the performance and for the design of a 2D-array for Multiple Input Multiple Output (MIMO) radar applications is presented. The proposed approach is based on the analysis of the ambiguity function associated to the array. Such analysis leads to the definition of an area in the 2D-angular field-of-view of the radar, denoted as ambiguity-free region, characterized by a low probability to obtain ambiguities in direction of arrival estimation. Simulations of a basic 2D-MIMO array are used to explain the proposed method, which is then employed as main criterion for the optimization of a 2D-MIMO sparse array composed of four transmitters and eight receivers. The optimization is performed through a genetic algorithm. The resulted element positions guarantee an ambiguity-free region span in the azimuth and elevation angles greater than 120° and angular resolutions of 8° and 5.9° on the azimuth and elevation angles, respectively. The optimized positions are then used to realize a 2D-MIMO sparse array that is integrated in a radar system operating at a center frequency of 76.5. Such an array is calibrated, and comparisons between the simulated and measured ambiguity functions show the effectiveness of the proposed method.
About Me
Christian Waldschmidt received the Dipl.-Ing. (M.S.E.E.) and the Dr.-Ing. (Ph.D.E.E.) degrees from the University Karlsruhe (TH), Karlsruhe, Germany, in 2001 and 2004, respectively. From 2001 to 2004 he was a Research Assistant at the Institut für Höchstfrequenztechnik and Elektronik (IHE), Universität Karlsruhe (TH), Germany. Since 2004 he has been with Robert Bosch GmbH, in the business units Corporate Research and Chassis Systems. He was heading different research and development teams in microwave engineering, rf-sensing, and automotive radar.
In 2013 Christian Waldschmidt returned to academia. He was appointed as the Director of the Institute of Microwave Engineering at University Ulm, Germany, as full professor. The research topics focus on radar and rf-sensing, mm-wave and submillimeter-wave engineering, antennas and antenna arrays, rf and array signal processing. He authored or coauthored over 200 scientific publications and more than 20 patents.
He is member of the executive committee board of the German IEEE MTT/AP joint chapter, and member of the German Information Technology Society (ITG). He is chair of the IEEE MTT-29 Technical Committee on Microwave Aerospace Systems and served as chair of MTT-27 Technical Committee on Wireless Enabled Automotive and Vehicular Applications. Since 2018, he serves as associate editor for IEEE MTT Microwave Wireless Components Letters (MWCL). Christian Waldschmidt was co-recipient of 11 best paper awards since 2014.