[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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