New Program

From: Scott Campbell (campbel7@the-i.net)
Date: Mon Nov 21 2005 - 23:50:35 EST

  • Next message: Russell Eberst: "2005NOV21.OBS"

    Been having a little trouble getting this message to post, so after several
    tries, I hope it only goes through once.
    
    I just put the finishing touches on an algorithm to produce SGP4 / SDP4 mean
    orbital elements from a position and velocity vector at epoch.  The
    algorithm essentially reverses the process of SGP4 which takes mean elements
    and produces a position and velocity vector.
    
    I needed the ability to advance a TLE to another epoch for SATFIT and
    SATID.  Up until today, I had been using a numerical method that converged
    to the mean elements most of the time...but this one gets exact results
    every time.
    
    If anyone would like this capability for their programs, I have posted the
    algorithm in C++ at
    
    http://www.coastalbend.edu/acdem/math/sats/rv2el.txt
    
    Both SATFIT and SATID have been updated.  A demonstrator program, RV2TLE,
    can also be found on the site
    
    http://www.coastalbend.edu/acdem/math/sats/
    
    RV2TLE does essentially the same thing that VEC2TLE does, but the interface
    is easier for me to work with.
    
    Scott Campbell
    Beeville, Texas
    Cospar 6226 28.4861N 97.8194W 107m
    campbel7@the-i.net
    
    
    
    
    
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