RE: Satellite Programs

From: Ted Molczan (
Date: Wed Nov 01 2006 - 14:25:26 EST

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    I am forwarding the following message on behalf of Rob Matson. --Ted M.
    Hi All,
    A quick chime-in on SGP4/SDP4 -- I've done a quick peruse of the "latest" source
    code, and I'll be surprised if it produces results that are any more accurate
    than what is currently reported by SkyMap. Indeed, I found bugs in both T.S.
    Kelso's and Goddard's implementations of SGP/SDP4 in the past, and went to great
    trouble to correct them, so I'm frankly hesitant to make any new code changes
    when neither Goddard nor U.S. Space Command has a very good track record of
    "getting it right".  Nevertheless, I may one day try running the new code with
    its test cases as is and comparing it to SkyMap to see how much they differ.  If
    the results are very similar, that would add confidence that both models are
    accurate implementations of the intended algorithm(s).  --Rob
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