[time-nuts] Carrier phase tracking

Rob Kimberley time.bandit at btinternet.com
Mon Feb 19 22:04:10 UTC 2007


If you take a look at the link I posted earlier, the advantages can be
summed up as follows:-

* More robust in noisy environments using a low-cost commercial DBS dish
antenna
* More accurate timing signal
* An alternate timing signal in case of GPS C/A loss

The paper was written by Hugo Fruehauf, who is CTO at FEI-Zyfer, and in the
'70s was Chief Engineer for the design and development of the initial
Block-I Navstar-GPS satellite at Rockwell. Later he became President of
Efratom.

I agree that we are not talking about carrier phase tracking in this
instance, and was simply trying to point out that WAAS/EGNOS equipped
hardware allows some useful advantages for timing.

Rob K
 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Dr Bruce Griffiths
Sent: 19 February 2007 21:33
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Carrier phase tracking

Rob Kimberley wrote:
> Interestingly, no one has mentioned the Augmentation systems like WAAS 
> or EGNOS where wide area correction data is transmitted down from 
> INMARSAT to improve nav accuracy. Primarily aimed at improved aircraft 
> navigation systems, it has a benefit for timing users. Zyfer have done 
> some work in this area, and I'll dig out a copy of the info and put it 
> on my web site, and post the link.
>
> Rob Kimberley
>   
Rob

The improvement in timing available with WAAS would appear to be a little
better than that available from a good timing receiver but far short of that
possible with carrier phase tracking.

Bruce

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