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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BBHHEJIPQTZ4JXUVKRKAMQDMCOB7E6IU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "BBHHEJIPQTZ4JXUVKRKAMQDMCOB7E6IU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YUKH4DQ77SUSHNVLE4ZNNW6R2PFZPWJD/?format=api",
    "sender": {
        "address": "daniel (a) destevez.net",
        "mailman_id": "c2eac82b839b45f5a7d3b923c1721007",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/c2eac82b839b45f5a7d3b923c1721007/emails/?format=api"
    },
    "sender_name": "Daniel Estévez",
    "subject": "Re: [amsat-bb] FM signal on FO-29?",
    "date": "2015-11-09T20:29:12Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QSDTIMF6GD7KRJ7GXM4UZOJXEWYNM36Y/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/523JBV36IEI3ZQKADVC4DMLTLVRC4SSD/?format=api"
    ],
    "votes": {
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        "status": "neutral"
    },
    "content": "Dear Bob and Zach,\n\nThis paper might be worth looking at:\nhttp://www.dtic.mil/dtic/tr/fulltext/u2/409103.pdf\n\nAs far as I know, it started the whole business of location by\nmeasurement of Doppler shift.\n\nApparently, according to the success of project Transit, it is possible to:\n\na) Compute the TLEs of a satellite by using just a few minutes of the\nDoppler curve of the beacon of a satellite, as received on a ground\nstation with known location.\n\nb) Compute the location of a ground station, by using just a few minutes\nof the Doppler curve of the beacon of a satellite with known TLEs, as\nreceived on said ground station.\n\nOf course, several variation on this are possible, such as the one which\nis discussed here:\n\nCompute the location of a ground station by using the Doppler curve of\nits transmissions during a pass, as received on a satellite with known TLEs.\n\nIt seems that the key point in all this is that the Doopler curve\ndepends independently on all the parameters in question (so not a cubic\npolynomial, which depends on fewer parameters).\n\n73,\n\nDani M0HXM/EA4GPZ.\n\nEl 09/11/15 a las 17:59, Zach Leffke escribió:\n> No worries, I thought on it a bit more and I think a cubic polynomial is\n> the right fit.  I also found some python tools for regression\n> calculations that I think will be useful for this.  Also, I think this\n> is pretty similar to how the COSPAS/SARSAT system used to locate lost\n> ships (EPIRBs) and downed Aircraft (ELTs) before the proliferation of\n> GPS and its inclusion in the locator beacons.\n\n",
    "attachments": []
}