mailing list bounced my pedantic response due to attached image size ...
here’s a link to a parallel thread that has the image of ISS altitude over time.
http://forums.qrz.com/index.php?threads/need-help-with-ascending-node.549308...
Sent from my iPhone
On May 19, 2018, at 6:43 AM, Todd W Deckard [email protected] wrote:
As an aside, the ISS makes an adjustment approximately once a month. They operate at a higher altitude now that the shuttle is no longer used for resupply. Here is a plot from heavens-above.
<image1.png>
I have observed that if you are using an Arduino or another processor with single precision math, the computed results age very quickly for any LEO and practically I must update every few days.
if you are using a more respectable math engine and are only concerned about the orbital elements; the error in the satellite position is approximately a kilometer at the epoch of the TLE. Then the simplified perturbation model (SPG4) used by the common software we use loses about 1-2km a day.
all of this is a bit pedantic if you are hand pointing an antenna in the noble tradition ...
best Todd Sent from my iPhone
On May 18, 2018, at 9:51 PM, [email protected] wrote:
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