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

[J. Forster]

Signal strength.

LORAN transmitters put out multi-hundred KW to MegaWatt class pulses. Wiki
has a list. I would think a GPS bird puts out less than 100 Watts CW.
Also, GPS birds are a LOT farther away, especially measured in wavelengths
(much higher path loss)

Those factors combine to make a huge difference in received power. It
could well be over 100 dB.

>From what I've heard a GPS jammer smaller than a deck of playing cards can
easily wipe out GPS w/in a mile or more for a week or longer.

-John

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


> I've read and heard from this forum as well as a number of other sources
> that GPS can be easily jammed.  What makes GPS so vulnerable?  How can it
> be
> jammed?
>
>  --
> David
> masondg44 at comcast dot net
>
>
> From: Francesco Ledda <frledda at verizon.net>
> Subject: Re: [time-nuts] The Demise of LORAN (was Re: Reference
> oscillator accuracy)
> To: Discussion of precise time and frequency measurement
> <time-nuts at febo.com>
> Cc: "time-nuts at febo.com" <time-nuts at febo.com>
> Message-ID: <E3E7BC70-4087-4E64-A713-61E8524B5EFA at verizon.net>
> Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes
>
> AOPA is pushing congress to repristinate funding for LORAN. General
> aviation is probably the heaviest user on this Nav system. The
> aviation user community would love to see Nav systems with integrated
> LORAN and GPS capabilty, but the industry has done little in this
> area, due to lack of government commitment to LORAN. The FAA knows the
> GPS can be easily jammed, but has done nothing do push LORAN as the
> GPS backup system.
>
> Sent from my iPhone
>
>
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