Accurate Long Term Height Determination at SLR Stations

Recent advances in SLR data analysis are described in The ILRS contribution to ITRF2020, Pavlis and Luceri (2022). Improved vertical resolution can now complement the more easily resolved horizontal motion.We examine the emerging results from ITRF2020 and prioritize the most accurate geodetic products.Height variations at SLR stations in tectonically stable regions of Australia and North America exhibit steady and consistent height rates. Robust long-term vertical motion models also enable precise monitoring of behavior at higher frequencies: annual, tidal, and diurnal. Tracking operation procedures have been implemented to reduce and monitor ranging measurement accuracy. Comparisons of the vertical signals in SLR, VLBI, DORIS and GNSS systems allow robust accuracy monitoring at co-located stations.Data handling techniques are outlined to enhance the isolation of the geodetic signals and enable their application to Earth and Ocean Model development