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Item type:Publication, Access status: without files , A wireless lightweight system node for energy efficient beehive sensingThis paper discusses a novel ultra low power sensor system for monitoring a beehives' health condition, which can be determined by measuring internal temperature and humidity variations. It comprises an autonomous battery powered sensor node which transmits the measured data over a 868 MHz wireless radio link. Expected runtime is greater than 2.1 years.Publicationtype: Conference Paper55 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Theoretical Limits and Interpolation based Improvements of a Correlation Based True-Speed-Over-Ground Estimation(2023-01); ; ; For a radar based True-Speed-Over-Ground measurement system an interpolation based precision improvement is presented. The system is based on the cross-correlation of two radar receive signals. The theoretical basics of the interpolation are thoroughly introduced and its limits are determined for the general case and for a specific hardware. Measurement results including the interpolation are presented and compared to the former implementation.Publicationtype: Conference Paper43 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Low-cost Software-Defined Radio System with Deterministic RX to TX Delay Using Timestamps(2023-01); ; ; Systems that rely on high-level software share the same disadvantage. Their execution time is unknown and thus the result of the processing is not available after a deterministic delay. The same is valid for software-defined radios. When only in receive (RX) mode the impact of the varying delay is negligible most of the time. However, in the case that the SDR needs to transmit (TX) this delay prevents from synchronizing the TX to the RX. This is crucial for many applications in communication and sensing though. This publication proposes and implements a method on a low-cost SDR transceiver, that provides the possibility to TX at a given time related to the RX with an error of ±l sample.Publicationtype: Conference Paper43 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A novel method for determining the degree of hydrogen loading of LOHC using cavity based permittivity measurements(2023-01); ; ; Liquid organic hydrogen carriers are a promising candidate to reduce the risk of handling hydrogen. However, the determination of their hydrogenation is still the subject of research. In this paper, a novel method for measuring hydrogen loading based on the permittivity of the hydrogen carriers used is presented. The cavity resonator developed for this application is shown and the design decisions made as well as the processing required are explained. Finally, the results of the test measurements are presented and discussed.Publicationtype: Conference Paper67 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A Simple Low Jitter Wireless Triggering and Unidirectional Communication System(2023-01); ; ; This paper presents a simple, low-cost synchronization system based on a Sub-GHz of-the-shelf transceiver. It is intended for synchronization between a base station and mobile measurement system for search and rescue applications. Time critical scheduling information can be transmitted together with triggering pulses. Additionally, during off time bulk data can be transmitted. The system allows for triggering with a known latency and with a standard deviation below 200 ns.Publicationtype: Conference Paper73