[time-nuts] WAAS for Time and Frequency Sync Applications

[Rob Kimberley]

Hi Brooke

Maybe I'll drop a line to Hugo to get his comments.

Rob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooke Clarke
Sent: 20 February 2007 00:45
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WAAS for Time and Frequency Sync Applications

Hi Rob:

I'm concerned about using an 18 inch Ku band satellite dish for GPS. 

At Ku band a wavelength is about 1 inch so the dish is 18 wavelengths
across.

But at GPS a wavelength is about 8 inches and so the dish is a little over 2
wavelengths across, a much broader (if any at all) pattern.
Also I thought the signal from the satellites was circularly polarized, so
bouncing it off a dish reverses the sense of the polarization.
So I can't see how they are getting the huge signal strength improvement
that's in the paper.

Have Fun,

Brooke Clarke

w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com



Rob Kimberley wrote:

>Rather than put it on my site, here is the link direct to Zyfer's site.
>
>http://www.zyfer.com/briefings/gps/waas%20for%20t-f%20aps%2010-04.pdf
>
>Rob Kimberley
>
>
>
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>time-nuts mailing list
>time-nuts at febo.com
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