Re: Satellite observations to track clock drift

From: Bjoern Gimle (b_gimle@algonet.se)
Date: Sun Mar 25 2001 - 05:43:21 PST

  • Next message: Alan Pickup: "Decay watch: 2001 Mar 25"

    No scientific study, but three randomly picked circular orbits at MM ~12,
    for which OIG "latest 5" show constant decay rates <0.00000038 and B* =
    +10000-3 give a spread of about 0.2 sec. within +/- 2 days.
    
    Two weeks later, one elset of 12328U 81022J is 1.5 seconds off, the other
    four still within 0.2 s.
    All five of 01314U 65027A are within 0.3 s, and  22079U 92052D within 0.6 s
    
    -- bjorn.gimle@tietotech.se (office)                         --
    -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
    -- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --
    -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
    
    ----- Original Message -----
    From: "Tony Beresford" <starman@camtech.net.au>
    To: <SeeSat-L@blackadder.lmsal.com>
    Sent: Wednesday, March 07, 2001 3:31 AM
    Subject: Satellite observations to track clock drift
    
    
    > The PC clock drifts rather badly. I recently checked out a satellite which
    > triggered the system ( ISS! ). It set me to wondering how accurately
    > one could get a clock correcton by doing a satellite observation
    > with such a system on something in a stable orbit. I rather think
    > the limitation might be the SGP4/SGD4 system TLE's are based on.
    
    
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