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

[Scott McGrath]

It doesn't    It simply increases the risk that GPS will be made unavailable due to events outside the operators control    Hence system risk profile is high    

Was not so high when LORAN was available as aviation, maritime and timing applications could gracefully degrade to LORAN in the event GPS was unavailable

Now if GPS availability is denied we are back to maps bowdoins sextants and chronometers for navigation except for the vanishingly small number of ships and planes equipped with INS

Scott 


Sent from my iPhone

On Jul 30, 2013, at 1:28 PM, "Lester Veenstra" <lester at veenstras.com> wrote:

> Yes. LOS jamming of the civilian code is easy; However whey do you think the
> use of LEO aids this?
> 
>>> Any competent engineer could have told the powers that be that a 
>>> satellite system based in LEO has a relatively high risk profile from 
>>> the Universe/hostile activity/spoofing and jamming
> 
> 
> Lester B Veenstra  MØYCM 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.
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.