Systematic differences in GPS antennas
I am testing elevation results on 2 different GPS antennas one being a Topcon PGA and the other a Topcon Hiper. There seems to be a consistent difference of 15mm between the 2 antennas on the same points. This is is with days of static data on each, different locations, correct antenna models in Magnet tools, correct height measurements etc.
Is it normal for there to be a systematic difference in antennas like this? The PGA is meant to be better for static so I will probably rely on that more.
I recall that being a persistent problem with certain Topcon antennae from several years ago. Do a search to see if there ever was a correction established.
Paul in PA
The thread I am thinking about may have been on another board in another place. Do not know if it is still accessible in some way.
As I recall a suggestion was to first test the receivers/antennas in the manner of a peg test. Observe, swap positions and reobserve to check the differences.
Paul in PA
Run the elevation checks through alternative software if possible. I've caught two major releases that applied the vertical offset twice. One was an early version of topcon office software.