Re: [amsat-bb] SGP4 vs PLAN13

["Michael R.Owen" <nlsa@xxxxxxxx>]

Juan -

SGP4/SDP4 is the complete system for using NORAD TLEs to determine 
satellite position.  Plan-13 is a subset of SGP4, using fewer terms.  
For short-term predictions (two or three weeks), both algorithms provide 
very good results.  Beyond a few weeks, SGP4 maintains accuracy for much 
farther into the future than Plan-13.  Plan-13 is significantly smaller 
and therefore faster.

73,
W9IP

Juan Machuca EA7FNJ wrote:

> Hi guys...
>
> Can anybody tell me the differences of SGP4 and PLAN13?
> I'm so lost on them... can anyone explain?
>
> Thanks
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-- 
Michael R. Owen, Ph.D.                      Dept. of Geology
Northern Lights Software Associates         St. Lawrence University
http://www.nlsa.com                         mowen@stlawu.edu
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