Re: how to create a TLE?

From: Frank@reednavigation.com
Date: Thu Dec 26 2013 - 00:16:50 UTC

  • Next message: wkitty42@gmail.com: "Re: how to create a TLE?"

    WK, you wrote:
    "if one has the apogee, perigee, inclination and period of an orbit, how can they create a TLE based on that information?"
    
    For an approximate TLE, it's not that difficult, but in order to be minimally useful, you'll also need an estimate of the longitude of the ascending node and the longitude of perigee (or apogee) on some date.  As I'm sure you know, satellite orbits precess rather quickly in both the line of apsides and the orbital plane thanks to the oblateness of the Earth (primarily). If we don't have that orientation information, especially the longitude of the ascending node, a satellite could be practically anywhere between the latitude limits implied by its inclination. Naturally a longitude (mean or otherwise) of the satellite in the orbit at some date would be even more useful but since that information goes stale first, it's probably best to treat that as an unknown. 
    
    Frank Reed
    Centennia Sotware / ReedNavigation.com
    Conanicut Island USA
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