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DTSTART;TZID=Europe/Berlin:20220602T131500
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UID:3964-1654175700-1654179300@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Patrick Gröschel
DESCRIPTION:Multi-path tolerant beacon localization using a high antenna-count receiver\nIn classic radar localization scenarios the transmitter and the receiver are in the same spot localizing a passive target by illuminating it with EM waves. However\, more and more localization applications arise\, where there is an active beacon/transmitter which is to be localized by some multiple-antenna base station\, e.g. a forklift in a warehouse\, a car in an urban scene\, and many more. For those localization applications\, electromagnetic waves in the microwave spectrum are well suited\, especially when exploiting the knowledge about the phase relations of the receive signal at different antennas of the receiver. The applied localization algorithms generally consider the EM wave to travel directly from the beacon to the base station\, which is not true in a reflective environment (warehouse\, city\, etc.). In such environments the wave also travels along non-direct paths from the beacon to the receiver due to reflections causing the so called “multi-path propagation”\, which causes heavy degradation of the localization accuracy especially in phase-based localization algorithms.\nIn this talk an algorithm is presented which uses compressed sensing and a high antenna count and physically large multi-channel receiver in order to estimate and subtract the impact of the non-direct propagation paths from the receive signal. Based on measurements in a 5.8 GHz radio setup\, it will be shown that this algorithm is well-suited to improve the position estimations in such scenarios.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2022-06-02-patrick-groschel/
LOCATION:Zoom
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20220623T130000
DTEND;TZID=Europe/Berlin:20220623T140000
DTSTAMP:20260420T065652
CREATED:20220620T093007Z
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UID:3981-1655989200-1655992800@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Prasenjit Saha
DESCRIPTION:Next-generation optical interferometry\, or the return of Hanbury Brown and Twiss\nHanbury Brown and Twiss are rightly famous as the pioneers of quantum optics in the 1950s\, but their real goal was astronomical imaging to the sub-milliarcsecond scale and beyond\, enough to resolve stars. This talk will explain how their counter-intuitive technique of intensity interferometry works\, and why it has become topical in the 2020s. Four science cases will be briefly discussed: the mass-radius relation in stars\, astrometric planet searching\, transient fireballs such as novae\, and finally\, a novel test for LISA.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2022-06-23-prasenjit-saha/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20220630T130000
DTEND;TZID=Europe/Berlin:20220630T140000
DTSTAMP:20260420T065652
CREATED:20220627T112634Z
LAST-MODIFIED:20220627T112634Z
UID:3987-1656594000-1656597600@ecap.nat.fau.de
SUMMARY:ECAP Seminar: Juergen Schmitt
DESCRIPTION:The stellar content of the eROSITA all-sky survey\nThe eROSITA instrument onboard the Russian-German SRG mission has so far completed more than four all-sky surveys and detected millions of new X-ray sources. Coronal X-ray sources\, i.e. X-ray emitters similar to our Sun\, constitute a significant fraction of the overall eROSITA source count\, yet these X-ray detected stars have properties quite different from those found for the Sun. X-ray emission is the most important proxy indicator for “stellar magnetic activity”\, hence an X-ray survey like that of eROSITA provides insights into the youth of the Sun\, when it was as “magnetically active” as the vast majority of the eROSITA detected stellar X-ray sources. The availability of precise astrometry from the Gaia satellite allows the complete identification of the stellar X-ray sky including an age assessment of the underlying sources. \nI will discuss and highlight these new research opportunities by providing recent eROSITA results on the Sco-Cen star forming region and very energetic eruptions from young stars.
URL:https://ecap.nat.fau.de/index.php/event/ecap-seminar-2022-06-30-juergen-schmitt/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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