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laforge, 12/12/2016 08:30 AM

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h1. GEO Mobile Radio
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This is the homepage of the Osmocom sub-project _GEO Mobile Radio_.
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It is collecting information and software related to the ETSI GEO Mobile Radio specification and its practical implementations like the [[Thuraya]] satellite phone network
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GEO Mobile Radio is a set of specifications describing a satellite based mobile phone network.
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[[BlogList(format=float,recent=5,max_size=350)]]
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h2. Radio aspects
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It uses the L-band frequencies  1634 to 1656 MHz (earth to space) and 1532.5 to 1554.5 MHz (space to earth) for communication
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between mobile phones and the respective satellites.  The polarization is circular (left) and the modulation is pi/4 QPSK, using
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a channel spacing of 31.25 kHz
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h2. Index
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* [[GMR_Specifications]] -- An Introduction and Overview into the GMR specifications
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** [[SpeechCodec]] -- The voice codec
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** [[A5-GMR-1]] -- The cipher
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* Devices:
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** [[Thuraya_SO2510]] -- A popular handset for use in the [[Thuraya]] system.
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** [[Thuraya_SG2520]] -- A dual-mode GSM/ [[Thuraya]] handset running WindowsCE.
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* [[Thuraya_Beams]] -- Information about the Thuraya beams
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** http://bit.ly//nInTOi -- Google Maps view of the Thuraya beams that we have found so far
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* [[OsmoGMR_Software]] -- Software that we wrote for GMR analysis
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** [[GettingStarted]] -- A small guide to get you going
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** "Browse code":http://cgit.osmocom.org/cgit/osmo-gmr/ -- Browse the [[gmr:]] source code
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* [[Receiver_Setup]] -- How to receive GMR signals coming down from a satellite
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h2. Presentations
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* 28C3 talk by Sylvain
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** Description: https://events.ccc.de/congress/2011/Fahrplan/events/4688.en.html
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** Video: http://media.ccc.de/browse/congress/2011/28c3-4688-en-introducing_osmo_gmr.html
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** Slides: http://events.ccc.de/congress/2011/Fahrplan/attachments/2027_28c3_introducing_osmocom_gmr.pdf
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* Recording of a "Wireless Hacking: GMR-1 / Thuraya" talk by Sylvain Munaut in the Moscow hackerspace Neuron.
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** Video: http://www.youtube.com/watch?v=IpZPamI2vTk
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* 31C3 talk by Sylvain
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** Description: https://events.ccc.de/congress/2014/Fahrplan/events/6267.html
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** Video: http://media.ccc.de/browse/congress/2014/31c3_-_6267_-_en_-_saal_g_-_201412271600_-_osmo-gmr_what_s_up_with_sat-phones_-_sylvain_munaut.html
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** Slides: https://events.ccc.de/congress/2014/Fahrplan/system/attachments/2496/original/31c3_gmr.pdf
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h2. Community
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* IRC: #osmocom on FreeNode
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* Mailing list : http://lists.osmocom.org/mailman/listinfo/gmr (Please make sure you read the [[cellular-infrastructure:MailingListRules]] before you start posting)
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