Re: [Paparazzi-devel] Tracker for antennas

[address@hidden]

Even the highest gain antennas of 18dB or so have around a 15 degree field of view, which will cover 0-500m altitudes at a distance of 2km.  A 24dB antenna will have half the beam width but would certainly be used for longer distances anyway.

If you're looking for a practical solution, it's far easier to eliminate the complicated pitch axis mechanism and accelerometer feedback loop and simply use a cheap 2-axis magneto to point the antenna toward the plane with a simple 1-axis mechanism.  You could also combine the single axis high-gain antenna with an upward facing c-pol low gain antenna and a diversity receiver to have optimal coverage in nearly all conditions.

But maybe not as interesting :)

Jeremy

-- address@hidden wrote:
Hi Gwen

The antenna has a GPS, a magnetometer and a pair of accelerometers to know its
position and where it's aiming at - It's also connected on the paparazzi bus
(serial or wireless xbee) to receive aircrafts position messages - Most of the
code running in the antenna is the same than the one running in the regular
autopilot.

HTH

Antoine

Quoting gwen hastings <address@hidden>:

> Hi Antoine,
>        First question, how does the tracker antenna perform its magic?
> GPS Telemetry?
> fascinated list members want to know.
>
>
>         regards,
>         guardrail
> ps took your advice.. twinstar II has arrived.. now to order/deal with
> united hobbies...
>
>
>
> address@hidden wrote:
> > Hello Rui
> >
> > Jeremy has finished his work at ENAC for a long time now - I have tutored
> his
> > work and can answer your questions
> >
> > Best Regards
> >
> > Antoine
> >
> > Quoting Rui Costa <address@hidden>:
> >
> >
> >>  Where can I find the contact of Jeremie Vacher, a student at ENAC? I need
> >> informations about his tracker for antennas. I would like to develop one.
> >>
> >>
> >
> >
> >
> >
> > _______________________________________________
> > Paparazzi-devel mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> >
> >
>
>
> --
>    "Arguing with an engineer is like wrestling with a pig in the mud;
>     after a while you realize you are muddy and the pig is enjoying it."
>
>
>
>
> _______________________________________________
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> address@hidden
> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>




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