TLE and SGP4 accuracies

From: Katherine Kline (
Date: Thu Feb 19 2004 - 10:08:17 EST

  • Next message: Ted Molczan: "RE: TLE and SGP4 accuracies"

    I know Dr. Kelso's website says NORAD updates its elsets only when the 
    current sets differs from the prediction by 5 km with a 90% confidence 
    interval.  Does anyone know of any data on how often specific 
    constellations are updated and the accuracy of NORAD's models (i.e., do 
    they also use special perturbation models for higher fidelity)?
    Also, I am trying to quantify the accuracy of SGP4 models... Is it largely 
    dependent on the atmospheric density model used, or are there also errors 
    from the propagation?
    Thank you in advance for your help,
    MIT Lincoln Laboratory
    phone: 781.981.1763 
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