From: Riley Williams (terhi.victor@logonet.com)
Date: Sat Mar 02 2002 - 12:02:32 EET
Hi Chuck.
I've to head out in a minute, so I'm just dealing with one aspect of
your email and will do a fuller reply later...
> With the discussion of TLE servers, one other thing I was thinking
> would be nice is the ability to have multiple keps for a satellite
> with a range of valid time for each.
> If you go to the NASA spaceflight page to get the keps for the ISS
> or the shuttle, they have multiple sets of keps with a range of time
> that they're valid. That way you can do predictions after maneuvers
> and such.
There is one obvious problem with that idea - those "future keplers"
are based on the INTENDED manoeuvres, and those aren't necessarily the
ACTUAL manoeuvres that took place. Another problem is that the TLE
format only specifies a start time from which the keplers can be used,
and not a finish time at which they should stop being used.
The intent behind your suggestion could, however, be realised fairly
easily by simply ignoring any keplers that quote a start time in the
future. This would result in the "current" kepler from such a multiset
being selected automatically, since the older ones would be marked as
superceded (this happens already) and the future ones would be ignored
(which probably doesn't happen at the moment). I'll have a look at this
when I get back from child-minding this afternoon/evening.
Best wishes from Riley.
PS: I use British English, you use American English, hence the
difference in spelling of "maneuvers" and "manoeuvres" above.
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