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RE: G3RUH Plan13



It is good enough, ... I ran tests comparing PLAN13 vs SGP4 (LEO), and SDP4
(orbits over 225 minutes), and very little difference if the keps are less
than 3 weeks old, ... if the keps are old the PLAN13 starts to fail. For
keps under 3 weeks you'd see no difference in Az, El, AOS, LOS, range-rate
etc, ... which is all that counts really. PLAN13 is much faster, and easier
to understand if you are into coding.

Paul, VP9MU

-----Original Message-----
From: Edson Pereira
To: amsat-bb@AMSAT.Org
Sent: 1/8/01 7:53 AM
Subject: [amsat-bb] G3RUH Plan13


Does anyone know how accurate is G3RUH's Plan13 algorithm for low earth
and AO-40-type orbits?

73,

-- Edson N1VTN


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