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 <
[email protected]> 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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