[time-nuts] Looking for information regarding Trimble 33429-00 microcentered GPS antenna.
Tom Van Baak
tvb at LeapSecond.com
Fri Jan 19 16:44:34 EST 2018
> What's in the antenna that makes North interesting? and/or how would a
> receiver take advantage of it?
The people that work at the mm level get very picky about details; antenna reception is not perfectly symmetrical or centered or equal at every frequency or angle. There is a massive database of antenna calibrations here:
Click on "Browse Antenna Information by Manufacturer and Model", pick some vendor, and hover over Drawing, Label, Side, Top. Then see the raw data for the calibration. Here's a random example:
Or view a 10 MB database: https://www.ngs.noaa.gov/ANTCAL/LoadFile?file=ngs14.atx
See also: https://www.ngs.noaa.gov/ANTCAL/FAQ.xhtml
Here's a couple of random links to give you an idea what this is all about:
"How to Use IGS Antenna Phase Center Corrections"
"ANTENNA PHASE CENTER VARIATIONS CORRECTIONS IN PROCESSING OF GPS OBSERVATIONS WITH USE OF COMMERCIAL SOFTWARE"
"Influence of GPS antenna phase center variation on precise positioning"
"Satellite Antenna Phase Center Offsets and the Terrestrial Scale"
That will keep you busy for a while.
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