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

J. Forster jfor at quikus.com
Thu Dec 15 19:00:19 EST 2011


KISS guys.

Suppose the Iranians had one of their buddies watching the drone base.
When they saw a drone take off, the guy just called a contact by cell and
the Iranians turned on a wide coverage jammer somewhere along the flight
path.

>From previous incidents and observations, if the drone came into the
jammed area, it'd lose GPS lock, orbit, and run out of gas and crash. They
could easily select a jammer site that was good for recovery.

FWIW,

-John

================



> 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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