[time-nuts] OT - GPS and North

[Mark Spencer]

Interesting thanks !



----- Original Message ----
From: Gary Chatters <gcarlistaa at garychatters.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sat, November 21, 2009 2:57:15 PM
Subject: Re: [time-nuts] OT - GPS and North

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

Gary



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