[time-nuts] Ashtech 3DF GPS

[Azelio Boriani]

According to this:
cedb.asce.org/cgi/WWWdisplay.cgi?80010
it seems that this GPS uses carrier phase tracking... it seems interesting.

On Tue, May 1, 2012 at 3:08 PM, Stan <swperk at earthlink.net> wrote:

> On more or less of a whim, I found and bought an Ashtech 3DF GPS. The
> interesting thing about this particular GPS is that it uses four separate
> GPS antennas mounted in a diamond pattern about 1 meter on a side and can
> compute not only the "usual" stuff, but also heading, roll, and pitch
> angles. I had heard of this being possible, but never actually seen it
> done.
> There are no accessories included with this unit, other than the power
> cord.
>
> Does anyone know where I can find a manual for it?
> Will this GPS work with just four ordinary active antennas or are the
> antennas special?
> Given the complexity of the additional data massaging it does to extract
> the
> angular data, does this also mean that it will have more accurate position
> and or timing performance?
> Does it need all four antennas to be able to do anything at all, or can it
> compute position and time with just one antenna connected?
>
> Thanks,
> Stan
>
>
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