[time-nuts] Spoofing GPS

[J. Forster]

Whether it's spoofing or jamming, domestic drones are becoming ubiquitous,
because they are just so tempting, and sooner or later one is gonna crash
onto a populated area, either by accident or deliberate mischief.

A piloted aircraft may be able to avoid hitting a school; a drone may not.

-John

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


> On 6/25/12 7:11 PM, Chris Albertson wrote:
>> On Mon, Jun 25, 2012 at 6:43 PM,<lists at lazygranch.com>  wrote:
>>
>>> Yeah, I read it. Typical Fox. The headline isn't accurate since they
>>> spoofed the civilian GPS system, not the military GPS.
>>>
>>
>> I think it is.  Currently the military uses GPS guided drones put the
>> article says they will see more and more used, even by companies like
>> Fed
>> Ex.  I don't think I deliver this will happen soon but it might.   The
>> article says that these new drones will be susceptible to GPS spoofing.
>>
>> But there is a simple "fix" that to me seem obvious.   When you design a
>> nab system for a drone they should use inertial nav.  You can't spoof an
>> IMU.   But the cheap IMUs drift and need GPS updates.  So each time you
>> update the INU to do a sanity check on the GPS and see if it is within
>> the
>> drift range of the IMU.  If not you assume the GPS is being spoofed and
>> continue using the INU data.
>>
>
>
>
> And of course, this *is* the way almost every autopilot/nav system out
> there works..
>
> You use IMU+GPS... GPS is long term, but crummy in the short term; IMU
> is good short term (e.g. to stabilize flight path), but crummy long term.
>
>
> Not to mention that spoofing GPS is actually fairly hard to do,
> reliably.. you have to have an internally consistent set of signals and
> observables that seamlessly connects to the original natural set and
> then walks off.
>
>
> jamming is easy, spoofing is hard.
>
>
> I would also expect that these things will very quickly go to L1/L5 for
> "safety of life" applications, and spoofing 2 frequencies is just that
> much harder.
>>
>
>
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