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    "message_id": "CAAJiE8Ngu2yh3Co55Y12bO3iqtftNEfBgFb-3BTknt2Kj9xikg@mail.gmail.com",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RDYKJ34MZNKFXFSLCRB727TTMI7ETA3L/?format=api",
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        "address": "kb2ysi (a) gmail.com",
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    "sender_name": "Don KB2YSI",
    "subject": "[AMSAT-BB] Re: Question",
    "date": "2022-03-04T00:39:41Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RDYKJ34MZNKFXFSLCRB727TTMI7ETA3L/?format=api",
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    "content": "I am going to take a guest on this, and likely stick my foot in my mouth.\n\nOptions:\n- Beat doppler by always having a satellite roughly at the same place in\nthe sky at \"all times\"; thus the need for #0,000's of satellites.  With the\nspacing as small as they are, doppler would not change enough to make too\nmuch of a difference.\n- They are tracking the available signals with multiple SDR slices and\npicking the best one\n\nThis might provide better information than my guesses:\nhttp://kassas.eng.uci.edu/papers/Kassas_Acquisition_Doppler_tracking_and_positioning_with_Starlink_LEO_satellites_first_results.pdf\n\nOn Tue, Mar 1, 2022 at 7:36 PM Dave Marthouse <[email protected]> wrote:\n\n> In view of the problems experienced by the StarLink satellites I have a\n> question.\n>\n>\n> I know the StarLink birds are in LEO.  That means there is lots of\n> Doppler shift involved.  How do the StarLink terminals keep locked on to\n> the signals on the downlink and compensate for the Doppler.\n>\n>\n>\n>\n>\n> --\n> Dave Marthouse N2AAM\n> [email protected]\n>\n>\n> -----------------------------------------------------------\n>\n> Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> AMSAT-NA.\n> Acceptable Use and Privacy Policies available at\n> https://www.amsat.org/about-amsat/\n>\n> View archives of this mailing list at\n> https://mailman.amsat.org/hyperkitty/list/[email protected]\n> To unsubscribe send an email to amsat-bb-leave(a)amsat.org\n> Manage all of your AMSAT-NA mailing list preferences at\n> https://mailman.amsat.org\n\n\n\n-- \n​--... ...--\nDon KB2YSI\nhttps://www.hamqth.com/kb2ysi\n\n\n",
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