[time-nuts] GPS Antenna on Tower.
bpl521 at outlook.com
Tue Jun 20 01:59:20 EDT 2017
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....
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.
GNSS-equipment - SP<http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx>
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.
Thorbjørn W. Pedersen
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