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Wrong Geostationary satellites Az El computation #322

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f6bvp opened this issue Feb 13, 2023 · 5 comments
Open

Wrong Geostationary satellites Az El computation #322

f6bvp opened this issue Feb 13, 2023 · 5 comments

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@f6bvp
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f6bvp commented Feb 13, 2023

While Windows 2.3.37 version performs correct Az El coordinates for geostationary satellites such as METEOSAT-10 (MSG-3) and METEOSAT-11 (MSG-4)
it is not the case on Linux Ubuntu 2.3.72 Gpredict version.
Computation of Az El coordinates are wrong.

However after updating METEOSAT TLE after downloading TLE from
http://celestrak.org/NORAD/elements/weather.txt

and updating from local filet
Az El coordinates are then correctly displayed !

Conclusion : TLE updating from Internet is failing to read correctly weather.txt file.

However QO100 geostationary satellite Az El coordinates are correctly computed on Linux as well as on Windows version !
Az : 150.02° El : 29.51°
as compared to Windows :
Az : 150.12° El : 29.54°

73 deBernard, f6bvp

@f6bvp
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f6bvp commented Feb 14, 2023

This may be also related to Celestrak URL change.
If so, forget the issue report.

By the way, could you add two references for 'new' Galileo satellites into galileo.cat ?

49809
49810

73 de Bernard, f6bvp

@f6bvp
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f6bvp commented Feb 16, 2023

Of course new Galileo satellite may be added by editing file ~/data/sat data/galileo.cat
Completing the file with :

49809
49810

@f6bvp
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f6bvp commented Feb 16, 2023

By the way is there any objection about updating .cat satellite catalogs by automatically collecting new object reference while reading TLE .txt files ?
I treated a similar question in the 90's in an application I wrote to update F6FBB bbs satellite data base.
Bernard, f6bvp / ai7bg

@f6bvp
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f6bvp commented Feb 16, 2023

While debugging I found that new satellite files are actually created but corresponding satellite numbers are not appended at the end of corresponding .cat file.

@f6bvp
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f6bvp commented Feb 20, 2023

After a new Gpredict source download, compilation and install I found that satellite .cat files where correctly updated for galileo satellites I am interested in.
This time I updated TLE before configuring ground station.
I will check again in order to verify if .cat file update depends on Gpredict initial configuration, selecting update with new satellite.

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