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dss91 / omgps

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GPS Sky View #11

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
I think the transformation from GPS NMEA data to position in the sky is not 
correct. 

As far as I understand this, the azimugh gives the position relative to 
north, so a satellite with an azimuth of 168 should be close to south of 
the viewer. However, this is not the case. 
I additionally compared your output with my Garmin GPS and Garmin displays 
this differently from yours. I think Garmin is correct. 
(In some ways it is easy for me to tell: my window faces south with heavy 
concrete walls to all other sides, so I can usually only get satellites in 
the south, however, your display shows them all in the east.)

I have not looked into your source in detail, but I think there is a simple 
bug in the geometric calculations that transform azimuth and elevation into 
x and y positions on the screen.

For Android I had written (and open-sourced) something very similar. I have 
attached the relevant code file, but you can find the whole thing at 
http://www.yunnanexplorer.com/download/androidapps/

Very nice work, otherwise.

Ludwig

Original issue reported on code.google.com by LudwigBr...@gmail.com on 17 Jul 2009 at 12:45

Attachments:

GoogleCodeExporter commented 9 years ago 
LudwigBrinckmann:

Thanks a lot for the report, it's a bug. That should be same as speed heading 
in main
view :)
ALL google services sucks today from China. This comment is send through tor,
but svn to google code suffers, gmail sufers, and even google.cn. It took me 
nearly
half a hour to 
submit a single file! God! 
I'm thinking about switch to another code hosting site. Even drop my gmail 
account.

BTW, I'm doubting if Google WebOS can be used here. 

I like Yunnan but haven't travel there.

Original comment by meng.qin...@gmail.com on 17 Jul 2009 at 7:11