[time-nuts] Ships fooled in GPS spoofing attack suggest Russian cyberweapon

[Magnus Danielson]

Hi,

Sure, some have started to work on it, but far from it. Traditional 
navigation helps a lot. While you have signal you can trim continously.

Cheers,
Magnus

On 08/14/2017 07:43 PM, paul swed wrote:
> Sextent, compass, and clock.
> Amazingly as posted on time nuts some time ago the Navy and Coast Guard
> have re-introduced that training.
> 
> On Mon, Aug 14, 2017 at 1:24 PM, Magnus Danielson <
> magnus at rubidium.dyndns.org> wrote:
> 
>> Hi Jim,
>>
>> On 08/14/2017 06:03 PM, jimlux wrote:
>>
>>> And GPS users who care about spoofing tend to use antenna systems that
>>> will reject signals coming from the "wrong" direction.  It's pretty easy to
>>> set up 3 antenna separated by 30 cm or so and tell what direction the
>>> signal from each S/V is coming from.
>>>
>>> I would expect that as spoofing/jamming becomes more of a problem (e.g.
>>> all those Amazon delivery drones operating in a RF dense environment) this
>>> will become sort of standard practice.
>>>
>>> So now your spoofing becomes much more complex, because the sources have
>>> to appear to come from the right place in the sky.  (fleets of UAVs?)
>>>
>>
>> You gain maybe 10 to 20 dB, but not much more.
>> A real protection scheme needs much more tolerance to handle severe
>> problems.
>>
>> There is an overbeliefe in such approaches, rather than trying to look at
>> the system analysis, since when you loose the GPS signal, what do you do. I
>> get blank stares all too often when I ask that trick question.
>>
>> Cheers,
>> Magnus
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