SA was turned off in May 2000, and has stayed off since. The US Mil have other ways of denying access to C/A on a local basis, rather than the global degradation that S/A gave. The main reason for this is that US MIL have mandated that all future procurement of GPS will be using SAASM Direct P/Y hardware. This equipment has enhanced black key security features to the existing P/Y hardware, plus the ability to acquire without the need for C/A (C/A was designed originally as purely the coarse clock to enable P code). Now, in times of conflict, all they need do is deny C/A in that area. The new hardware can run without C/A, come up cold without C/A, but the enemy and anyone in that geographic area is denied service.
This info is in the public domain. FEI-Zyfer (formerly Odetics) www.fei-zyfer.com whom I used to work for manufacture SAASM GPS timing products. Rob K -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Magnus Danielson Sent: 12 March 2006 18:58 To: [email protected]; [EMAIL PROTECTED] Subject: Re: [time-nuts] GPS Selective Availability. Is it On or Off? From: Rex <[EMAIL PROTECTED]> Subject: Re: [time-nuts] GPS Selective Availability. Is it On or Off? Date: Sun, 12 Mar 2006 09:58:25 -0800 Message-ID: <[EMAIL PROTECTED]> > On Sun, 12 Mar 2006 12:36:12 -0500, Chuck Harris <[EMAIL PROTECTED]> > wrote: > > >SA was turned off to allow the troops in Desert Storm to use civilian > >GPS units (there was a critical shortage of military P-band units) > > > >It has never been turned on since. > > > >-Chuck Harris > > Where did you get that notion? Desert Stom was 1991, wasn't it? What > happened in 2000, like this web page mentions? > http://www.cycc.org.uk/news/gpssa.htm The SA was enabled again after Desert Storm, and it was not until the presidential order that it was turned off again for a longer period of time. See this page if you don't beleive me: http://www.leapsecond.com/pages/saoff/ Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
