[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?
Hal,
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:
https://www.ngs.noaa.gov/ANTCAL/
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:
https://www.ngs.noaa.gov/ANTCAL/LoadFile?file=TRM105000.10_NONE.atx
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"
http://acc.igs.org/antennas/igs-pcvs_gpsworld10.pdf
"ANTENNA PHASE CENTER VARIATIONS CORRECTIONS IN PROCESSING OF GPS OBSERVATIONS WITH USE OF COMMERCIAL SOFTWARE"
http://www.uwm.edu.pl/wnt/technicalsc/tech_13/B12.PDF
"Influence of GPS antenna phase center variation on precise positioning"
https://www.sciencedirect.com/science/article/pii/S2090997713000515
"Satellite Antenna Phase Center Offsets and the Terrestrial Scale"
http://www.igs.org/assets/pdf/W2016%20-%20PY0703%20-%20Rothacher.pdf
That will keep you busy for a while.
/tvb
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