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

Neville Michie namichie at gmail.com
Thu Aug 26 01:42:41 UTC 2010

The nominal accuracy is no better than using the sun as a compass.
Two GPS systems (say TBolts) have to be an amazingly great distance  
apart to give a decent azimuth.
Apart from star observations, a gyrocompass is the tool of choice if  
you want to add an azimuth to a GPS position.
Does anyone know how laser gyroscopes are developing?
Neville Michie

On 26/08/2010, at 11:04 AM, 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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