Matthias Hein

• Professor Dr. rer. nat. habil.
• Professor (Full) at Technische Universität Ilmenau

The increasing angular resolution of modern automotive radar sensors enables a more detailed and more accurate perception of the environment. This has implications for the measured target detections of extended objects such as vehicles, which cause complex backscatter signatures. Simulation-based approaches strive to enable efficient testing concep...

Usual traffic flow assessment suffers from fixed sensor positions and the related data aggregation. The object tracking of Intelligent Transport Systems (ITS) along their trajectories can overcome these limitations by providing precise positioning data from vehicles in real time. Within this context, we investigate the content of vehicle-to-everyth...

Connected and automated driving technologies enable a safer and more efficient road traffic. An important aspect is the precise perception of the environment, including vulnerable road users, which is particularly necessary for safety purposes. Imaging radars, based on the inverse synthetic aperture radar (ISAR) can offer advantages over convention...

Ensuring that virtual sensor models are capable of generating realistic data is a major challenge. It is of particular importance to investigate the properties of real-world sensor data, in order to incorporate them into a consistent simulation tool chain. Radar sensors are influenced by a variety of physical effects which lead to strong fluctuatio...

The upcoming 6G mobile communication standard will offer a revolutionary new feature: Integrated sensing and communication (ISAC) reuses mobile communication signals to realize multi-static radar for various applications including localization. Consequently, applied ISAC propagation research necessitates to evolve from classical monostatic radar cr...

Intelligent transportation moves towards automated and connected driving, which requires detailed environmental perception, with automotive radar as one key sensor modality. Conventional radar systems are challenged by the need for high resolution in azimuth, elevation, range, and velocity. To meet the requirements of high angular resolution, the a...

Elastic, bendable and stretchable electronics establish a new and promising area of multi-physics engineering for a variety of applications, e.g. on wearables or in complex-shaped machine parts. While the area of metamorphic electronics has been investigated comprehensively, the behavior at radio frequencies (RFs), especially in the GHz range, is m...

This paper provides an approach for controlling the level of risk when operating highly automated transportation systems like cars, trains and similar. Such systems replace human perception and decision-making by employing highly sophisticated solutions based on electronics, IT, and AI. Such systems have demonstrated the potential for building high...

This documents outlines the shared approach and joint achievements of the German-Japanese research cooperation VIVID - German Japan joint virtual validation methodology for intelligent driving systems -, which combines the two sister projects VIVALDI (German partners) "Virtual validation toolchain for automated and connected driving" and DIVP (Japa...

This Roadmap overviews present challenges and opportunities for the development of antenna measurement techniques and technologies to support the all-pervasive and ever-increasing demand for radio-frequency wireless systems in modern society. The Roadmap comprises 19 inspiring contributions by 34 leading experts in antenna measurements. Modern soci...

Currently, 5G low-earth orbit satellite communications offer enhanced wireless coverage beyond the reach of 5G terrestrial networks, with important implications, particularly for automated and connected vehicles. Such wireless automotive mass-market applications demand well-designed compact user equipment antenna terminals offering non-terrestrial...

5G low-earth orbit satellite communications offer enhanced wireless coverage beyond the reach of 5G terrestrial networks, with important implications, particularly for automated and connected vehicles. Such wireless automotive mass-market applications demand well-designed compact user equipment antenna terminals offering non-terrestrial jointly wit...

The extension of low-earth orbit (LEO) services to non-terrestrial mobile communications has huge potential for eliminating network white spots and providing high-speed, low-latency links with worldwide geographic coverage. State-of-the-art user terminals for mobile platforms are too large for integration into a passenger vehicle. Antenna elements...

Virtual validation methods strive to reduce the testing efforts of automated driving functions significantly. However, assuring the fidelity of deployed sensor models based on objective criteria remains an unsolved challenge, especially for radar target detection point clouds, since they are subject to major stochastic fluctuations.This work focuse...

The radar scattering characteristics of extended objects are an important parameter for perception and tracking algorithms in automated driving tasks. Therefore, high-fidelity sensor models are required to simulate and evaluate typical driving scenarios in virtual testing applications. While the general analysis of typical scattering centers of pas...

Specific human RF exposure is either hardly or even impossibly assessed by conventional field probe measurement. Limited location access, limited availability of suitable measurement equipment and challenging accuracy requirements necessitate new evaluation methods. We propose a hybrid exposure assessment based on the combination of experimental an...

In the present investigation (2002) the current-voltage characteristics (CVCs) of break junctions in polycrystalline $MgB_2$ samples have been studied in the temperature range $4.2 K < T < T_c$. An inelastic Cooper pair tunneling accompanied by the emission of Leggett plasmons has been found for the first time in $MgB_2$ Josephson contacts. A fine...

In the era of automated and connected driving, more and more cars will be equipped with wireless transmission technologies such as mobile communications 4G (LTE) and 5G, WiFi, Bluetooth, and V2X. For the technical implementation of V2X-communications, different standards like cellular-V2X from the cooperation 3rd Generation Partnership Project and...

Radar sensors play an important role in automated driving technologies. However, the rising number of sensors deployed to enable autonomous driving functions leads to enormous validation efforts. While simulations are a possible approach to accelerate the validation process, the development effort for realistic sensor models increases significantly...

The employment of passive reflectors enables the millimeter-wave automotive radars to detect an approaching vehicle in non-line-of-sight conditions. In this paper, the installation of such reflectors above the sidewalk at an intersection is proposed and studied, avoiding pedestrians' blockage and road dust effect at ground level. Through the analys...

The 5 th generation new radio (5G NR) standards create both enormous challenges and potential to address the spatio-spectral-temporal agility of wireless transmission. In the framework of a research unit at TU Ilmenau, various concepts were studied, including both approaches toward integrated circuits and distributed receiver front-ends (FEs). We r...

Today, most traffic systems depend on Global Satellite Navigation System (GNSS) based positioning. The occurrence of Radio Frequency Interference (RFI) at GNSS receiver is a pressing issue which occurs due to low-power level of satellite signals. Although the current state-of-the-art antenna arrays can cope with certain interference, they require l...

Interference signals are a severe threat to any GNSS receiver. Due to the low reception power of satellite signals, even comparably weak interferences can significantly decrease the positioning accuracy of the receiver or lead to a complete signal loss. Therefore, any active interference signal has to be mitigated to ensure a continuous and safe op...

Automotive radar systems in automobiles are key for automated and connected driving. Conventionally, functional tests and safety validation of automotive radar systems are carried out in field-operational tests, but are very resource-expensive and they offer neither reproducibility nor reliability. To improve efficiency and reliability, though at t...

Automotive millimeter-wave radar systems are key to automated and connected driving technologies. It is necessary to validate their functional performance in the installed state thoroughly, reliably, and efficiently under realistic conditions before deploying them in real-world traffic. Field-operational tests are the ultimate phase of verification...

Automotive radar systems are indispensable for advanced driver assistance systems and traffic safety. Besides existing monostatic radar techniques, bi-static radar sensing like passive coherent location offers additional options to improve the radar visibility of vulnerable road users. Regarding the testing and evaluation of signal processing algor...

Radio frequency interference (RFI) poses a severe problem for conventional GNSS receivers. Even low powered RFI can block the reception of satellite signals and prevent a position determination. Antenna array systems have been proven suitable to counteract RFI by incorporating spatial processing techniques. The large size of uniform rectangular arr...

Optical microdisk cavities with certain asymmetric shapes are known to possess unidirectional far-field emission properties. Here, we investigate arrays of these dielectric microresonators with respect to their emission properties resulting from the coherent behavior of the coupled constituents. This approach is inspired by electronic mesoscopic ph...

Ambiguous direction-of-arrival estimation is a key problem for uniformly distributed antenna arrays with inter-element spacing exceeding half of the carrier wavelength. The primary reason behind such ambiguity are the grating lobes generated in the radiation patterns due to insufficient spatial sampling. An L-shaped orthogonal arrangement of radiat...

The continuous development of faster and more efficient wireless communication standards challenges the design of RF transceivers with stringent requirements. The compatibility with deployed standards, such as the universal mobile telecommunications system, long-term evolution (LTE), and 5G, further tasks RF front-end design. The coexistence of mor...

A steady attempt to introduce new, more complex and demanding wireless transmission standards in various market segments is unfolding. In the communication market, a rising number of frequency bands of operation with increasingly complex modulation schemes is being proposed to satisfy the steady demand for higher channel capacities and data rates....