[time-nuts] The Demise of LORAN (was Re: Reference oscillatoraccuracy)

Robert Atkinson robert8rpi at yahoo.co.uk
Sun Nov 15 21:14:23 UTC 2009


There is also the use of directional antennas. Difficult to put your jammer between the Rx and the sat. 

--- On Sun, 15/11/09, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:


From: Magnus Danielson <magnus at rubidium.dyndns.org>
Subject: Re: [time-nuts] The Demise of LORAN (was Re: Reference oscillatoraccuracy)
To: didier at cox.net, "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Sunday, 15 November, 2009, 20:48


Didier Juges wrote:
> Enough for what? To bug the heck out of a citizen suddenly unable to find his way to the movie theater?
> 
> Weapon systems and aircraft navigation  are unlikely to be affected by such a simple device on the ground, even if deployed in large quantity. Most of the stuff that really needs GPS has decent antennas that look up, not down.

They are affected, it is well covered, but the difference is the distance from the jammer until affected. It's a fairly well-understood problem and the difference between civilian and military receivers lies in signals, keying for access, bootstrapping and testing and counter-measures such as IMU.

Cheers,
Magnus

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