Closed elidana closed 10 months ago
Some basic plots for cycleslip and mp1/mp2 from the 1st April 2021 until 1st June 2021, initial testing, can test with a longer duration
Mp1 (0.21 --> 0.25) and Mp2 (0.48 --> 0.54) looks like values are slowly increasing, cycle slip fairly consistant and fluctuating
Data for Mp1, Mp2, Cycleslip from gloria @elidana
Drop in mp2 in September 2019 likely related to netr9 being swapped to an alloy (https://github.com/GeoNet/tickets/issues/5232)
We have removed the antenna and installed a new one today. No water damage was found in either antenna cable ends, or the TRM57971.00 that was installed at the site. We have also performed a tie in survey to have a better control on the offset introduced by the antenna swap.
Will revisit time series data in 2 weeks time to (hopefully) verify an improvement in data quality
The RAWK time series has already improved, with the apparent offset on the vertical component is now reverted and noise now back to standard data scattering.
Horizontal components might also have been affected, and it does look like the antenna might have cracked and water then seeped in to it, but there are no visible cracks in the antenna, apart the normal build up of gren scum etc. no obvious cracking or external damage
period with bad data is from 2021-04-22
to 2021-10-20
(UTC), that was when the antenna was swapped.
The GNSS site RAKW is showing a degradation of time series data after 22 April 2021 (Sigrun picked this up and notified us).
@megankortink confirmed that there are no equipment change that can explain that or issues with the site recorded in the ticketing system, and that the antenna at the site is +10years old.
Land ownership changed around the same period, so we will investigate if the vertical offset and poor quality of data after April 22 might have been caused by a change in the antenna surroundings. Another possible options is that the antenna is degrading, as it was installed in 2011
A link to the vertical time series plot: https://fits.geonet.org.nz/plot?type=scatter&sites=RAKW&typeID=u&start=2020-01-01T00:00:00Z&days=700