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Working RTK Base Station for less than $1,000
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Phainein7
Posted 5/5/2024 10:15 (#10729344 - in reply to #10728472)
Subject: RE: Working RTK Base Station for less than $1,000


Tipton, KS		Footnote

5) What is a NRP?

The north reference point (NRP) is a physical antenna feature which must be oriented toward the true north direction. Antenna calibration values assume that the NRP is properly oriented to true north. Please consult the antenna diagram for precise information on the NRP for your antenna model.

1) What is an "antenna calibration"?
An antenna calibration is the act of determining the point of reception of the Global Navigation Satellite System (GNSS) carrier phase signals. Antenna hardware such as the antenna elements and pre-amplifiers create signal phase advance and delay before passing the signal to the receiver. The phase advance/delay changes the range measurement, and will introduce error to position solutions. The point of signal reception of an antenna is not a physically measurable location, and varies depending upon the direction of the satellite signal being received. Therefore antenna calibrations create a map of phase advance and delay which depends on the satellite position in an antenna-centric frame (based on a specific ARP and NRP).

https://geodesy.noaa.gov/ANTCAL/FAQ.xhtml
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