GNSS refractometry/reflectometry (GNSS-RR) raw data (RINEX 3.02) including GPS, GLONASS, and GALILEO phase, code, and SNR observations. Measured automatically from a high-end GNSS system above (base) and one high-end and one low-cost antenna (rover) below the snow surface. Intended to retrieve surface mass balances from automated, simultaneous, and continuous estimation of snow deposition/ablation, SWE, and density. Measurements are taken in 1s (above snow, needed interval for GNSS reflectometry) and 30s (below snow) intervals. Rinex 3.02 files are stored every 24h and pushed via FTP to a Neumayer III server. Data is available since 26. November 2021.