[time-nuts] OT - GPS and North

Gary Chatters gcarlistaa at garychatters.com
Sat Nov 21 23:03:05 UTC 2009


Gary Chatters wrote:
> Mark Spencer wrote:
>> Would Time Difference of Arrival techniques combined with an array of 
>> four closely spaced antennas work with Gps signals as a means of 
>> determing the orentation of the antenna array vs the gps satellites ? 
>> (I'm thinking traditional TDOA techniques may not work with gps 
>> signals.)
>>
> 
> There are commercial products available: 
> http://www.hemispheregps.com/Default.aspx?tabid=379
> http://www.hemispheregps.com/Default.aspx?tabid=412
> 
> 
> These devices claim less than 1 degree RMS heading accuracy.
> 
> Here the antennas are integrated and a fixed 0.5 meter apart.  They do 
> (or did) make a board that could be used with separate antennas, but I 
> can not find it right now.

I think this is the one: 
http://www.hemispheregps.com/Products/PrecisionProductsGroup/PrecisionProducts/CrescentOEMModules/tabid/136/Default.aspx



> 
> I have no idea of how the math works for computing heading.
> 



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