I’m having a bit of a brain fade and just need some input for confidence.
I am doing a PPK of topo collected on foot. The data collection incorporates a couple of established geodetic marks. The base is a CORS station about 20 km away.
I have used both RTKLIB and the new Emlid Studio for this, but the latter brought to my attention the vertical offset of the base in the Rinex header info - not something i have really considered before. In this case it its 0.055 m. See screen shots below. Base position from .pos output file: % ref pos :-37.806755409 175.109198252 69.4554
I have PPK’d using a full range of settings/combinations, some provide fix from start to finish, it but never really get as close as I would have thought to a match with the geodetic marks. The difference is always around 0.06 m +/- 0.005-0.010.
if I switch off this antenna height in the Emlid Studio then the offset to the geodetic mark flicks the other way (positive to negative) but not in an entirely equally way - nor in the desired effect.
I don’t believe i should be switching it off but the effect was quite odd.
Any advice would be appreciated.