Processing and validation of FORMOSAT-7/COSMIC-2 GLONASS Total Electron Content observations

Space-based TEC observations have historically relied on GPS signals, and the processing methodologies and data quality of GLONASS absolute TEC observations are thus less well established.

We present a description of the differences in the processing for the F7/C2 GLONASS absolute TEC observations. This primarily entails estimation of a paired receiver-transmitter differential code bias, which is needed due to the GLONASS usage of frequency-division multiple access. We additionally perform a validation of the F7/C2 GLONASS absolute TEC observations through comparison with colocated F7/C2 GPS absolute TEC observations.