Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
The layer of protection analysis (LOPA) is a well‐established and valuable tool to assess process risk in a plant. Due to the complexity of the method, the composition of the team evaluating a safety scenario bears the inherent risk of subjective judgment and may influence the outcome significantly. Factors influencing the results of the analysis are the experience and knowledge of team members, but...
Wave propagation over terrain topologies and surface wave propagation relate to several practical applications the simulations of which often become very complex and reach their limits due to the size of objects. Exemplarily, one application is the illumination issue of wind turbines located on different terrains, such as hills in the context of potential bearing errors of the VHF omnidirectional...
In this contribution a vectorial channel sounding system for narrowband MISO applications is presented. The channel is measured using a continuous wave signal allowing the characterization of time-variant channels and Doppler shifts within changing multipath propagation environments. The channel sounder's architecture with an analog-digital converter writing the measured data to a SD-card enables...
Typically, the investigations of electromagnetic interference (EMI) refer to single limit values that may not be exceeded at a receiver's input stage. In that manner the actual quality of a navigation signal is not assessed at all, neither related to individual disturbance levels that are not continuous wave. This contribution discusses test setups and configurations of how to measure the navigation...
This contribution proposes a concept for specifying properties of time-variant propagation channels and their impact on modulated signals. The basic idea is to measure the modulating properties of the channel in an intermediate frequency band where necessary numerical calculations can effectively be performed with drastically reduced demands on calculation time and memory. A typical scenario for scatterers...
A measurement setup is presented in a geometrically up-scaled environment to investigate intra device communication scenarios where an in-situ parameter variation at real scale is hardly feasible. Moreover, due to expected high frequencies and the electrical size of involved geometries numerical simulations are still demanding for such scenarios.
In this contribution a vectorial channel sounder with multiple transmitting antennas and one receiving antenna is presented. This channel sounder characterizes time variant propagation channels providing a measure of how wave propagation deviates from ideal free space propagation. In particular, it quantifies additional amplitude modulation characteristics in a multipath environment as well as a frequency...
The key aspect of reverberation chambers (RC) is the statistic behavior of the field inside including the influence of the moving, respectively rotating mode stirrer. By means of a vectorial channel sounder presented in this contribution the dynamic influences of the stirrer are investigated with respect to its mechanical relaxation time and its efficiency. Additionally, the ability of vectorial channel...
This contribution presents a sophisticated compliance study, whether emissions of transient sparks occurring between pantographs of rails and overhead lines can interfere with receivers of the instrument-landing-systems (ILS) onboard aircraft. Though the investigated interference scenario actually is quite specific and arose in the context of the enhancement of the airport Frankfurt in Germany it...
This contribution discusses probable influences of rotating wind turbines on the bearing error of the VHF omnidirectional radio range which is an important navigation system. Such disturbances are as old as this navigation system itself, but has become a timely topic in Germany in the frame of its new renewable energy strategy. As this is a very complicated scattering scenario which is not fully understood...
As an important scatterer in Vehicle-to-X (V2X) communication scenarios, traffic signs frequently appear along the roads and highly influence the radio channel. This paper presents a set of simulations and measurements for the bistatic radar cross section (RCS) of various realistic traffic signs. The simulations are performed by using full-wave analysis, whereas measurements are conducted at an open...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.