Everything You Never Knew You Needed to Know About Differential and Precise Point Positioning
RTK delivers centimeter-level accuracy in real time when the base is within 10–20 km, while PPP provides similar accuracy globally but requires minutes to converge. John Deere’s StarFire system improved from 10 cm to 5 cm accuracy using dual-frequency GPS+GLONASS. Galileo HAS began global decimeter-level PPP corrections in 2023. The u-blox ZED-F9P module enables centimeter-level positioning for drones and robots at low cost.
