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What does RTK, PPK, and SBAS mean?

What does RTK, PPK, and SBAS mean?

Real Time Kinematic (RTK) uses real  time information from a reference base station to obtain cm level accuracy in the HGuide Navigation System.  A real time connection such as a cellular modem is needed.

Post Processing Kinematic (PPK) provides similar performance improvement but does so with the recorded GNSS and HGuide data.  Satellite correction information is obtained after recording from a dedicated data repository.  

Satellite Based Augmentation Systems (SBAS) provides improved position via a regional correction system; but the corrections are inherent to the provided GNSS signals.  No user action is needed and much of the world is covered by SBAS.