Could you let me know the height of antenna from bottom?
We have two sparkfun RTK surveyor units and the model of antennas is TOP106
There is a figure in the antenna below.
Please let me know which number is the height of this antenna from bottom, 43.50mm or 39.50mm?
I’m conducting topgraphic survey and using this RTK GPS to check ellipsoidal height. The Reduced Level of ground service equals to = surveyed height - pole height - antenna height. Thanks heaps.
Thanks for you quick reply.
could you let me know whether the band I am using is L1 or L2?
I’m in Australia and when I use this RTK GPS, I pair the GPS to app SW Maps via bluetooth, then collect the app to Allday RTK to get an accuarate GNSS height.
For general RTK work, it’s hard to get everyone to agree on which offset to apply, and in reality it doesn’t matter all that much due to the actual precision & accuracy of typical RTK solutions. But you are introducing ~1cm of systematic error (Mechanical vs Actual) by not using the Actual Phase Center for the TOP106 per the NGS Calibration.
For Static Sessions, the calibration becomes very important.
But to answer your question for RTK work, I personally use the actual L2 phase center at 48mm above ARP per the NGS calibration file.
When using a different antenna without NGS calibration, you are forced to stick with the Mechanical Phase Center, per it’s dwg.
Thanks heaps rftop. It looks like that this question is more complicated than I though
Could you check which number I could use in Melbourne Vicotoria Australia if possible? Thanks for supplying these data but I cannot interprete them.