{"guid":"f738088c-f2cf-54ab-a6cd-f3f5c5cc8481","title":"gr-iridium: Unter der Haube","subtitle":null,"slug":"gpn18-89-gr-iridium-unter-der-haube","link":"https://c3voc.de","description":"gr-iridium ist freie Software welche Signale des Iridium-Satellitennetzwerks empfangen und demodulieren kann. Dieser Vortrag schaut unter die Haube von gr-iridium und zeigt wie es 1000 Frames pro Sekunde auf einem 8 Jahre alten quad-core Rechner demodulieren kann.\n\nIridium wurde Ende der 90er gestartet. Damals wurde es als sehr schwer angesehen seine Signale aufgrund der hohen Bandbreite und staendig aenderndem Doppelerversatz abzufangen. Mit dem Aufkommen von Software Defined Radio und schnelleren Rechnern ist dies jedoch nicht mehr der Fall.\n\nDieser Vortrag schaut genauer auf die Struktur von gr-iridium und zeigt wie GNURadio benutzt werden kann um sehr \"burstige\" und sich schnell aendernde Signale zu empfangen, etwas worin es traditionell nicht besonders gut ist. Er wird euch auch eine grundsaetzliche Einfuehrung in das Demodulieren von (Q)PSK Signalen geben.\n\nNicht behandelt werden die \"hoeheren\" Schichten von Iridium. Da koennt ihr euch die Vortrage vom 33C3 (https://media.ccc.de/v/32c3-7154-iridium_update) und der HOPE (https://www.youtube.com/watch?v=cvKaC4pNvck) anschauen.","original_language":"deu","persons":["schneider"],"tags":["gpn18","89"],"view_count":551,"promoted":false,"date":"2018-05-11T00:00:00.000+02:00","release_date":"2018-05-11T02:00:00.000+02:00","updated_at":"2026-03-03T01:30:03.126+01:00","length":3406,"duration":3406,"thumb_url":"https://static.media.ccc.de/media/events/gpn/gpn18/89-hd.jpg","poster_url":"https://static.media.ccc.de/media/events/gpn/gpn18/89-hd_preview.jpg","timeline_url":"https://static.media.ccc.de/media/events/gpn/gpn18/f738088c-f2cf-54ab-a6cd-f3f5c5cc8481-timeline.jpg","thumbnails_url":"https://static.media.ccc.de/media/events/gpn/gpn18/f738088c-f2cf-54ab-a6cd-f3f5c5cc8481-thumbnails.vtt","frontend_link":"https://media.ccc.de/v/gpn18-89-gr-iridium-unter-der-haube","url":"https://api.media.ccc.de/public/events/f738088c-f2cf-54ab-a6cd-f3f5c5cc8481","conference_title":"Gulaschprogrammiernacht 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