[time-nuts] GPS Antenna on Tower.

[Bryan _]

I have wondered how geologists are able to measure tectonic plate movements in the earths surface to a couple cm's when the sensors from what I see/read they are nothing more than sensors in concrete boxes?. I believe they use various technologies such as Very Long Baseline Interferometry<http://www.see.leeds.ac.uk/structure/dynamicearth/plates_move/active_tectonics/vlbi.htm> (VLBI) and Satellite Laser Ranging<http://www.see.leeds.ac.uk/structure/dynamicearth/plates_move/active_tectonics/slr1.htm> (SLR)


All fascinating stuff....




-=Bryan=-


________________________________
From: time-nuts <time-nuts-bounces at febo.com> on behalf of Thorbjørn Pedersen <Thorbjorn.Pedersen at ikm.no>
Sent: June 19, 2017 9:42 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] GPS Antenna on Tower.

http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
[http://www.sp.se/sv/index/resources/GNSS/PublishingImages/pelare.jpg]<http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx>

GNSS-equipment - SP<http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx>
www.sp.se
GNSS-equipment RISE has equipment for GNSS (Global Navigation Satellite Systems) for applications in Time and Frequency, Positioning and Atmospheric Studies.



Have a look at the best receiving antenna I know about.

The tower must have cooling tubes coiled around it because of the sun heating one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.

Best Regards

Thorbjørn W. Pedersen


_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
time-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
www.febo.com
time-nuts is a low volume, high SNR list for the discussion of precise time and frequency measurement and related topics. To see the collection of prior postings to ...



and follow the instructions there.