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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3EC2BMXFKJ2BRC55FMVXTXPMKIVPHMMC/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "9B967BD03A8642D28215E74E7E323738@hppav",
    "message_id_hash": "3EC2BMXFKJ2BRC55FMVXTXPMKIVPHMMC",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3EC2BMXFKJ2BRC55FMVXTXPMKIVPHMMC/",
    "sender": {
        "address": "am25544 (a) triton.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Armando Mercado",
    "subject": "[amsat-bb] Re: Satellite Tracking?",
    "date": "2011-11-03T16:04:33Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Geoff,\n\nThe doppler method was used in the early days\nof the space age, (and maybe still is).  It's a\nneat bit of detective work.  Monitor the frequency\nof the satellite, and determine the time of closest\napproach.  From that you can determine the\nspeed and altitude.  Build up enough data points\nand you can figure out the orbit.  Like you said,\nthe target doesn't need to cooperate, just transmit.\n\nAs with the latest cubesat launch, when there are\nmany objects, it takes several weeks to figure out\nwho's who.  This could be way around that problem.\n\n73 Armando  N8IGJ\n\n\n\n\n>Hi Armando et al,\n\n>I don't know about the methods written up by Karl & James. For a long time \n>I've had a project using Doppler shift curves in the back of my mind \n>(the \"target\" doesn't need to cooperate). I have most of the hardware based \n>around my HPSDR box and a t'bolt frequency reference. The software hasn't \n>even progressed beyond ideas and algorithms. I haven't even picked a language \n>or development environment (one day).\n\n>I can see a very accurate Doppler shift curve being useful in the early days \n>after a multiple cubesat launch. How accurate would you need to be to \n>pick \"your\" cubesat from the crowd? One pass? multiple passes?\n\n>Anyway that's this morning's breakfast coffee ideas from me. Have fun \n>y'all :-).\n\n>73 de Geoff vk2tfg (/3). \n\n",
    "attachments": []
}