[time-nuts] Story in the Economist about GPS jamming

[Lester Veenstra]

What does that have to do with "... based in LEO has a relatively high 
> risk profile from the Universe/hostile activity/spoofing and jamming..."?

I note the previous correction  to your statement, that it is MEO not LEO.


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: Scott McGrath [mailto:scmcgrath at gmail.com] 
Sent: Tuesday, July 30, 2013 12:11 PM
To: lester at veenstras.com; Discussion of precise time and frequency measurement
Cc: <jfor at quikus.com>; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Story in the Economist about GPS jamming

The atmosphere protects the earth from a lot of stuff the universe throws at us 

Solar flares , space junk , micrometeors just the usual hazards the space at large has.  Inability to service satellites when transmitters or RCS fuel exhausted

Sent from my iPhone

On Jul 30, 2013, at 9:31 AM, "Lester Veenstra" <lester at veenstras.com> wrote:

> Exactly what do you mean by "... based in LEO has a relatively high 
> risk profile from the Universe/hostile activity/spoofing and jamming..."?
> 
> Other than a LOS, in a jammers immediate area, GPS is not subject to 
> jamming, and for the critical users, ie, the DOD, very difficult to 
> jam, even in a LOS.
> 
> The LEO makes it harder to jam since the received signal strength is 
> higher than would be practical from GeoSync orbit, not easier,  as is 
> implied my Mr. McGraths comment.
> 
> Lester B Veenstra  M YCM K1YCM W8YCM
> lester at veenstras.com
> 
> US Postal Address:
> 5 Shrine Club Drive
> HC84 Box 89C
> Keyser WV 26726
> GPS: 39.33675 N  78.9823527 W (Google)
> GPS: 39.33682 N  78.9023741 W (GPSDO)
> 
> 
> Telephones:
> Home:                     +1-304-289-6057
> US cell                    +1-304-790-9192 
> UK cell                    +44-(0)7849-248-749 
> Guam Cell:              +1-671-929-8141
> Jamaica:                 +1-876-456-8898 
>  
> This e-mail and any documents attached hereto contain confidential or 
> privileged information. The information is intended to be for use only 
> by the individual or entity to whom they are addressed. If you are not 
> the intended recipient or the person responsible for delivering the 
> e-mail to the intended recipient, be aware that any disclosure, 
> copying, distribution or use of the contents of this e-mail or any 
> documents attached hereto is prohibited.
> 
> 
> 
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