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hbaidu / open-phd-guiding

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Request to display directions N/S/E/W on Target #347

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
Post from Pascal:

some months ago I suggested to Andy to add  the cardinal directions (N S E W) 
on the PHD graphs in order to quickly help to identify guiding problems (polar 
alignment,  drifting, balancing etc). If I remember the problem was the 
knowledge of the pier side to properly identify the north and south, but now 
with the 'aux mount' function (great think, thanks!) may be this is no more a 
problem. May be you can reconsider the possibility to add the four useful 
letters in the PHD graphs? 

thread: 
https://groups.google.com/forum/?fromgroups=#!topic/open-phd-guiding/qOqLkmHnWno

Original issue reported on code.google.com by andy.gal...@gmail.com on 19 Oct 2014 at 4:57

GoogleCodeExporter commented 8 years ago

Original comment by andy.gal...@gmail.com on 19 Oct 2014 at 5:57

GoogleCodeExporter commented 8 years ago

Original comment by andy.gal...@gmail.com on 19 Oct 2014 at 5:58

GoogleCodeExporter commented 8 years ago 
We do not always know if the GuideNorth command is actually moving the scope 
North. For example with an ST-4 connection, GuideNorth will move the scope 
South after a pier flip. Also, some ASCOM mounts behave differently after a 
pier flip. Some will move North, others will move South.

Konstantin had the idea for ASCOM mounts to check the declination before and 
after the North guide pulse moves during calibration. The change in reported 
declination gives us a value for true North vs Guider North.

After a pier flip the orientation of true North vs Guider North can change. 
However, in that case we can use the value of the setting "reverse dec output 
after meridian flip" to update the polarity if necessary.

Once we implement this scheme (dec polarity: N/S/unknown) we can display 
N/S/E/W labels on:
  - the RA/Dec overlay
  - the target display
  - the history graph

Original comment by andy.gal...@gmail.com on 1 Apr 2015 at 4:33