In some implementations, one or more devices may obtain measurement information for an epoch, the measurement information indicative of a pseudorange measurement, a carrier phase measurement, and a doppler measurement performed by a reference global navigation satellite system (GNSS) receiver of radio frequency (RF) signals transmitted by a plurality of GNSS satellites. The device(s) may obtain initial state-space representation (SSR) data comprising orbit correction, clock correction, and code bias information for the epoch. The device(s) may determine ionospheric correction data for the epoch based on the measurement information and the initial SSR data. The device(s) may determine tropospheric correction data for the epoch based on the determined ionospheric correction data, the measurement information, and the initial SSR data. The device(s) may provide the expanded SSR data, wherein the expanded SSR data includes the ionospheric correction data and the tropospheric correction data.