21 research outputs found
Measuring vertical jump height using a smartphone camera with simultaneous gravity-based calibration
Vertical jump height is an important tool to measure athletes' lower body power in sports science and medicine. Several different methods exist to measure jump height, but each has its own limitations. This work proposes a novel way to measure jump height directly, using optical tracking with a single smartphone camera. A parabolic fall trajectory is obtained from this video by tracking a single feature. The parabolic trajectory is then used to partially calibrate the camera and convert pixel measurements into real-world units, allowing the calculation of the achieved height. Comparison to an optical motion capture system yields promising results.© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
Optimized Minimum-Search for SAR Backprojection Autofocus on GPUs Using CUDA
Autofocus techniques for synthetic aperture radar (SAR) can improve the image quality substantially. Their high computational complexity imposes a challenge when employing them in runtime-critical implementations. This paper presents an autofocus implementation for stripmap SAR specially optimized for parallel architectures like GPUs. Thorough evaluation using real SAR data shows that the tunable parameters of the algorithm allow to counterbalance runtime and achieved image quality.© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
A Case Study on Multi-Softcore Aided Hardware Architectures for Powerline MAC-Layer
Powerline communication is a promising technology
for connecting Internet of Things (IoT) applications, where
devices have strict limitations regarding available installation
space and power dissipation. Especially the wiring of these devices
benefits from not having additional cables for network connection.
Thus, saving costs and additional installation effort. In this paper
a very resource-efficient implementation of a HomePlug 1.0.1
[5] compatible powerline MAC layer, which is used to control
the data flow and link status of a powerline connection, is
presented. The MAC layer is implemented in two variants, using
state machines and softcore processors. A comparison of the
two approaches shows that the softcore design used up to 78 %
less FPGA ressources and is superior in terms of flexibility and
maintainability
Synthetic Aperture Radar Algorithms on Transport Triggered Architecture Processors using OpenCL
Live SAR imaging from small UAVs is an emerging field. On-board processing of the radar data requires high-performance and energy-efficient platforms. One candidate for this are Transport Triggered Architecture (TTA) processors. We implement Backprojection and Backprojection Autofocus on a TTA processor specially adapted for this task using OpenCL. The resulting implementation is compared to other platforms in terms of energy efficiency. We find that the TTA is on-par with embedded GPUs and surpasses other OpenCL-based platforms. It is outperformed only by a dedicated FPGA implementation.
© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
Implementing Synthetic Aperture Radar Backprojection in Chisel – A Field Report
Chisel is an emerging hardware description language which is especially popular in the RISC-V community. In this report, we evaluate its application in the field of general digital hardware design. A dedicated hardware implementation of a Synthetic Aperture Radar (SAR) processing algorithm is used as an example case for a real-world application. It is targeting a modern high performance FPGA platform. We analyze the difference in code size compared to a VHDL implementation. In contrast to related publications, we classify the code lines into several categories, providing a more detailed view. Overall, the number of lines was reduced by 74% while the amount of boilerplate code was reduced by 83%. Additionally, we report on our experience using Chisel in this practical application. We found the generative concept and the flexibility introduced by modern software paradigms superior to traditional hardware description languages. This increased productivity, especially during timing closure. However, additional programming skills not associated with classic hardware design are required to fully leverage its advantages. We recommend Chisel as a language for all hardware design tasks and expect its popularity to increase in the future
Efficient implementation of code-based identification/signatures schemes
International audienceIn this paper we present efficient implementations of several code-based identification schemes, namely the Stern scheme, the Véron scheme and the Cayrel-Véron-El Yousfi scheme. For a security of 80 bits, we obtain a signature in respectively 1.048 ms, 0.987 ms and 0.594 ms
Powerline Communication System-on-Chip in 180 nm Harsh Environment SOI Technology
Broadband powerline communication systems using Orthogonal Frequency Division Multiplexing (OFDM) can utilize existing power lines to transmit data packets alongside power distribution. Recent standards focus towards high speed multi-media in-house streaming. With improvements towards robustness and throughput new standards increase the speed and reliability of in-house powerline systems. A very different approach is the use of powerline communication systems in a deep drilling environment where temperatures of more than 150°C and pressure levels up to 30 000 psi are present. Typical applications in this environment usually do not require more than several kbit/ys per node and are more reliant on a stable and continuous connection. Here, a powerline communication system can reduce the amount of wiring needed and increase communication robustness significantly. This work provides a harsh environment suitable, reliable and standard compliant communication ASIC that is manufactured in XFAB 180 nm Silicon-On-Insulator (SOI) technology allowing operating temperatures of up to 175°C. The die size is 5.25 mm x 5.25 mm and contains a complete Homeplug 1.0 communication stack with an environment for boot, interfacing and debugging. The data rate is as high as 6.1 Mbit/s using the fastest transmission mode and reaches the theoretical maximum of 0.55 Mbit/s in the robust OFDM (ROBO) mode which is of particular interest for harsh environment applications. To the best of the authors knowledge, this is the first OFDM-based powerline communication ASIC which is particularly designed for harsh environment.© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
Verwendung von Intertialsensoren zur automatisierten Auswertung sensomotorischer Tests
Um die sensomotorische Leistungsfähigkeit von Sportlern zu evaluieren, gibt es verschiedene sportwissenschaftliche Standardtests, wie zum Beispiel den Y-Balance-Test (YBT). Allerdings ist bei vielen dieser Verfahren ein Tester nötig, der die Durchführung leitet und das Ergebnis bestimmt. In dieser Arbeit wird der Ansatz für ein System auf Basis von Inertialsensoren (IMUs) vorgestellt, durch das die Auswertung verschiedener im Bereich der Sportwissenschaften gängiger Tests automatisiert werden kann. Implementiert wurde der YBT und die aktive Winkelreproduktion. Durch die Automatisierung muss während des Tests kein Tester mehr anwesend sein, wodurch beispielsweise Freizeitsportler, Leistungssportler, Trainer, Vereine, aber auch Forschungseinrichtungen in die Lage versetzt werden, diese Tests jederzeit durchzuführen. Durch die Verwendung von IMUs, die ihre eigene Ausrichtung als Quaternion schätzen, wird im vorgestellten System die aktuelle Pose der Knochen im Skelett des Nutzers berechnet. Aus diesen werden dann die verschiedenen Testergebnisse, wie Gelenkwinkel oder die Position einzelner Extremitäten, bestimmt. Als Plattform kommt ein mobiles Gerät zum Einsatz, auf dem die Berechnung und die Visualisierung in Echtzeit erfolgen