[time-nuts] GPS-III

Chris Albertson albertson.chris at gmail.com
Thu Jul 24 12:32:06 EDT 2014


"GPS-III" is the wrong term.   You mean "block three spacecraft".
The Air Force is buying 8 new satellites they are calling "block III"
and they don't launch until at least 2016.  If the current satellites
are in good health they could delay the launch.   If the past is a
guide to the future the AirForce will eventually buy more advanced
block III called "IIIa" or something.    As a GPS users you'd never
really know.  Those numbers are contracting terms, not signal terms.
The signals in question are already being transmitted by a few of the
latter block II satellites.

I think you can buy multi-frequency receivers.  Remember GPS is not
longer the only system.  There are stelites from the US, Europe,
Russia, China and Japan.    Adding more more frequencies allows the
receiver to detect multi path and makes it harder to jam but the
timing is not greatly improved over say the M12.

On Thu, Jul 24, 2014 at 12:14 AM, John C. Westmoreland, P.E.
<john at westmorelandengineering.com> wrote:
> Hello All,
>
> Does anyone know yet of any companies that are making GPS-III receiver
> chip-sets/modules yet?
>
> Some web-sites on GPS-III:
>
> http://www.gps.gov/systems/gps/modernization/
> http://www.gps.gov/systems/gps/modernization/civilsignals/
> http://www.losangeles.af.mil/library/factsheets/factsheet.asp?id=18830
>
> Regards,
> John W.
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-- 

Chris Albertson
Redondo Beach, California



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