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

Chris Albertson albertson.chris at gmail.com
Thu Dec 15 19:15:37 EST 2011


All I can say is that the sheet metal on that drone looks really good.
 I doubt it ran out of fuel.

They either landed it which would require very high level spoofing
ability or like I said use something like a butterfly net on it.   The
metal is just to straight for a crash.


On Thu, Dec 15, 2011 at 3:44 PM, gary <lists at lazygranch.com> wrote:
> I've talked to the GPS jammers at Nellis and have seen their gear. They
> don't spoof but just jam. The gear is totally COTS. Some Marconi signal
> generator that can generate white noise at the two GPS frequencies. They
> have omni or directional antennas. They have an old Russian jammer on hand,
> but the Marconi works a lot better.
>
> I've been jammed by them. It is interesting in that the GPS just suddenly
> dies. That is, it seems to track given some noise, but you hit a point where
> it suddenly gives up. It is the only time I've seen no satellites shown on
> the display.
>
> It wouldn't surprise me if a Growler could spoof a GPS, but I have no hard
> evidence that it can.
>
> I'm in agreement with they just jammed everything and the thing ran out of
> fuel. I have a FOIA somewhere on a Predator crash. With LOS, it just orbits.
> In the case of this Predator, it orbited into a mountain near Creech AFB.
>
>
> On 12/15/2011 3:18 PM, Chris Albertson wrote:
>>
>> I bet this drone contains no technology that is not exportable.  Of
>> course they had to think about a crash.
>>
>> I also bet it had an inertial nav system as backup to the GPS.   But
>> and this is the key to all backups.  You have to know the primary is
>> failed.   When you jam GPS the smart way is not to over power it with
>> white noise but to first transmit an IDENTICAL signal.  Then very
>> slowly move your stronger signal away from "truth" until it is sending
>> a false signal.   This way the receiver does not know it is being
>> jammed.  No I did not just think of this, it's what "everyone" does.
>>  But why then if the INS and GPS disagree was there not an alarm?   It
>> was likely a low-cost INS that needed periodic updates from a GPS
>>
>> I would not rule out that they simply made the drone fly into a big
>> fishing net and dropped it with a parachute in a kind of controlled
>> mid air collision.   Heck the US used to capture film cam falling from
>> space with big nets
>>
>> Chris Albertson
>> Redondo Beach, California
>>
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-- 

Chris Albertson
Redondo Beach, California




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