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Mr. Luddite[_4_]

On 5/5/2020 6:15 PM, wrote:
On Tue, 5 May 2020 17:09:31 -0400, "Mr. Luddite"
wrote:

On 5/5/2020 3:19 PM, Bill wrote:
wrote:

https://rntfnd.org/2020/04/27/norway-powerless-against-gps-interference-nrk/

This issue is not confined to northern Norway. There is a stretch of
the East River in New York Harbor near UN Headquarters where there
have been many well documented instances of GPS jamming. We've
experienced it ourselves.

Apparently jammers are easy to buy:

https://gizmodo.com/jamming-gps-signals-is-illegal-dangerous-cheap-and-e-1796778955

It looks like we're going to need some new form of electronic
navigation some time in the future, something more difficult to jam.

The power output of GPS stats is very low. So easy to jam, spoof is
harder, but easy to override a very low power signal. Sats transmit at
less than 50 watts. Even with a decent gain antenna, the receivers get a
very low power signal. How many square miles does that 50 watts cover?

Fortunately for military purposes our navigation systems are not 100%
reliant on GPS. Inertial Navigation Systems (INS) are highly accurate
(in some cases *more* accurate than GPS alone) and when hardened can
be used without benefit of GPS updates.

In normal applications both INS and GPS are used together but if
GPS was disabled due to jamming, the INS system can operate solo.

This company announced a miniature, low cost INS system in 2017 that has
applications in commercial and consumer items like drones.

The future may see GPS going the way of LPs and CDs as newer
technology takes it place. INS isn't new ... it's been used
in the military and commercial airplanes for years ... but as
the cost comes down it could take the place of GPS even in our
private vehicles.

https://insideunmannedsystems.com/worlds-smallest-better-gps-inertial-navigation-system-now-available/

===

A combination of GPS and INS constantly checking each other would be
close to ideal. Other than cost and size, the biggest historical
problem with INS is the tendency of position accuracy to drift as
errors accumulate over time. You'd need some artificial intelligence
in the loop to arbitrate the inevitable position disagreements and
determine when to reset the INS starting point.

I know the commercial pilots reset it every time just before takeoff.

The military versions (which would never be affordable for commercial
or consumer use) are highly accurate. Think nuke subs.

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