[time-nuts] "The GPS navigation is the weakest point,"
Pieter ten Pierick
time-nuts-mail at tenpierick.com
Thu Dec 15 18:52:40 EST 2011
> 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
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...
> 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.
>> > 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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