Purpose: To understand the different GNSS correction services that can be used to enhance the performance and precision of the INS-DU.

Last Updated: October 2020

There are 2 different categories of GNSS correction services. These categories are based on either the State Space Representation (SSR) or Observation State Representations (OSR) of the errors. Both categories solve the same problem, but each use different techniques, delivery mechanisms, and core technologies to do so. Both SSR and OSR correction services are used to mitigate key GNSS errors (i.e. orbits, biases, clocks, etc.) in order to enable high precision GNSS performance.