Hi, sorry I'm coming into this conversation late, but I have something that
may apply.  I have no personal experience with these, other than doing a
PCB layout for one, but an associate has used them with success.  These are
complete RF Time-of-Flight geolocation modules from Decawave.
https://www.decawave.com/

These operate in the 3-6GHz range and claim a resolution down to 10cm.  The
DWM1000 module and an associated processor can be implemented on a 2"x2"
board easy.  The DWM1000 is available at DigiKey ~$25.  They also have
development boards and evaluation kits.  My friend that has used them has
said that the software application utilities were extensive and easy to
use.  They claim ranges of 70 to 250 meters, but I'm sure that is highly
dependent upon the antennas and other factors.

Gary

On Tue, Oct 8, 2019 at 7:59 PM RussellMc <apptechnz@gmail.com> wrote:

> On Wed, 9 Oct 2019 at 02:26, Allen Mulvey <allen@amulvey.com> wrote:
>
> > I've never done anything like this but I wonder if you could
> > avoid the rotating direction finder and have a non-moving
> > solution. Perhaps with a couple of stations along the
> > perimeter of the field with two directional antennae
> > pointing in somewhat different directions you could
> > interpolate the difference in signal strength to get a
> > bearing from each?
> >
> > I mentioned the POSSIBLE use of rotating tx or rx as it adds a degree o=
f
> information input not easily available with static solutions.
> Rotation could be using phased arry but that seems vanishingly unlikely t=
o
> be attractive here.
> A mechanical scanner adds time domain (OK, time) variation and a
> periodicity to the signal and a signal which has a shaped "lobe"  as the
> tx-rx path aligns and the dealigns once per rotation.
> Watching that by eye on eg an oscilloscope would make it very clear in mo=
st
> cases which was the real desired path and which the varying spurious path=
s.
> Analysis 'programmatically is far harder but the cyclical peaks are liabl=
e
> to help heaps [tm].
>
>
>            Russell
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