Re: [amsat-bb] AO-40: transponder off!!

[Margaret Leber <maggie@xxxxxxxxxxxx>]

Alan K. Adamson wrote:

 > The squint angle calc in SatTrack is *way* off compared to something
 >  that has a real geometry model for deep space satellites.  If you
 > notice, SatTrack uses the TLE mode for deep space objects (ao-40
 > counts as one).  It will only use the LEO model for the LEO sats.
 >
 > Because of this, there is an error of up to 20 degrees that I've seen 
between SatTrack and Nova with the exact same alon/alat settings.

Ouch.

Well, the SatTrack docs do offer that it's inaccurate for highly
eccentric orbits. I thought I was getting away with it because the az/el
tracking seemed to be pretty much bang-on. What I'm hearing is it's the
squint angle calc that's not to be trusted at high eccentricities.

Bummer.

73 de Maggie K3XS

-- 
-----/___.   _)   Margaret Stephanie Leber    / "The art of progress  /
----/(, /|  /| http://voicenet.com/~maggie   / consists of preserving/
---/   / | / |  _   _   _    `  _AOPA 925383/ order amid change and /
--/ ) /  |/  |_(_(_(_/_(_/__(__(/_  FN20hd / change amid order."   /
-/ (_/   '  K3XS  .-/ .-/    ARRL 39280   /___ --A.N.Whitehead ___/
/____ICQ 7161096_(_/_(_/__AMSAT 32844____/ <maggie@voicenet.com>


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