[time-nuts] "The GPS navigation is the weakest point,"

Azelio Boriani azelio.boriani at screen.it
Thu Dec 15 18:56:38 EST 2011


Yes, agree. An OCXO is enough (but my opinion is the same: only jammed not
steered).

On Fri, Dec 16, 2011 at 12:52 AM, Pieter ten Pierick <
time-nuts-mail at tenpierick.com> wrote:

> Hi,
>
> > Of course, but then when you switch on your transmitter you are on your
> > own. Considering the speed of a drone (700Km/h?) you need a great
> > coverage, so much RF power out.
>
> Easy: Use a dish antenna on the transmitter.
> Very directional with large ampification.
> If using a 'moderate' opening angle, just pointing the dish at the drone
> by hand will work.
> After starting the system locked to the gps time, once the signal is on
> the drone,
> I don't think it matters anymore. (It might not even matter at the start?)
> The drone will follow the timing of the jammer.
> As the drone will receive all signals from the single transmitter, the
> relative timing will be fixed.
> Just using a OCXO will have a good enough short time stability to allow
> the system to work, I would think.
> As the plan is to land or jam the drone within say 10 minutes, long term
> stability is not that important...
>
> Greetings,
> Pieter.
> >
> > On Fri, Dec 16, 2011 at 12:22 AM, J. Forster <jfor at quikus.com> wrote:
> >
> >>
> >>
> >> You could just have a GPS receiver and use that to sync up the jammer.
> >>
> >> -John
> >>
> >> ==============
> >>
> >>
> >> >
> >> > To transmit a GPS cluster signal you need a GPS simulator to generate
> >> > the cluster so even a single transmitter can do this, the relative
> >> > timing and not the different positions of the transmitters is what the
> >> > receiver sees.
> >> >
> >> > When over-powering the real birds you just needs to be close enough in
> >> > timing, and it is the location of the target which is of interest.
> >> >
> >> > If this scenario is true... then they have not done their home-work. I
> >> > would ask a number of critical questions already from my civilian
> >> > background.
> >> >
> >> > Cheers,
> >> > Magnus
> >> >
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> >> >
> >>
> >>
> >>
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>
>
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