Overall Summary
Use Precise Ephemeris (Final, Rapid, Ultra-Rapid) for processing carrier phase data.
To position a point at the few cm level, at least 4 hours of carrier phase data are required when the associated baseline exceeds 26 km in length.
Most National CORS data are available within one hour.
Sub-meter positioning is achievable when using 1 minute of code data in a differential, post-processed mode.