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What is the difference between the ARP position and the L1 phase position in the NGS pos file?

April 26, 2017ARP difference file L1 ngs phase pos position

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What is the difference between the ARP position and the L1 phase position in the NGS pos file?

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The ARP (Antenna Reference Position) position is the position of the part of the antenna from which the phase center offsets are calculated. This is the position that should be used to properly apply the phase center offsets in the processing. If you do not have phase center information for the antenna and the offsets are set to zero, then you should use the L1 phase center position. However, you will get the best results by using the ARP and the phase center offsets. (See CORS FAQ #1 for information on how to obtain phase center offsets for most antennas.