[time-nuts] Slightly OT - GPS-Based Accurate Direction Finding

[Brooke Clarke]

Hi David:

The military used to use a gyro compass to determine true north for 
artillery.  This need to be on the order of a mil.  Now they use the Gun 
Laying System that's part of the later PLGR GPS receivers and all of the 
DAGR GPS receivers.  There's two versions of this:
1) uses a single GPS receiver and the other
2) uses two GPS receivers.  I have some data at:
http://www.prc68.com/I/DAGR.shtml#ZBL

The method is based on doing carrier phase post processing.   Note you 
don't need to tie into reference station data since only the distance 
and bearing between two points is being determined.

Have Fun,

Brooke Clarke
http://www.PRC68.com


David Smith wrote:
> As a fair percentage of the discussion amongst the learned gentlemen 
> on this group involves GPS-based timing systems, I'd like to ask a 
> non-time related, but GPS-related question.
>
> As part of microwave radio experimentation, often on windy hilltops, I 
> have a need to find direction very accurately.  I have seen advertised 
> GPS-based Azimuth Pointing Systems such as this:
> http://www.ascscientific.com/APS.html
> However they are a little (lot) out of my budget range.
>
> The system seems to work by taking the raw satellite phase information 
> from two separate GPS systems and crunching the data to come up with 
> an azimuth figure.  Has anyone heard of a (Open Source?) program that 
> could be used to do these calculations?
>
> Regards,
> David Smith
>
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-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com