GLOBAL PRECISE GNSS
Precise Point
Positioning
Precise Point Positioning combines carrier-phase and code observations with precise satellite orbit and clock products to produce a precise position without relying on a nearby user-operated base station.
Precision without
a nearby field base.
PPP uses undifferenced GNSS observations, precise satellite orbit and clock information, detailed error models, and estimation over time. The precise products are generated from wider reference-station and analysis infrastructure.
Unlike conventional RTK, the user does not need simultaneous observations from a nearby surveyed base. That does not mean PPP is infrastructure-free: correction products, reference frames, communications for real-time use, and processing services remain essential.
Global observations
become user corrections.
The IGS Real-Time Service is one public example of infrastructure distributing precise orbit, clock, code-bias, and phase-bias products for PPP and related uses.
Two paths to
precise positioning.
This comparison describes architectural tendencies, not a performance guarantee for commercial services. Modern services can combine concepts from several approaches.
Wide-area does not mean
instant or unconditional.
Convergence is operationally important.Standard PPP may require a material initialization period; service design and augmentation influence that time.
A correction stream still needs delivery.Real-time PPP depends on communication of precise products to the receiver.
Labels hide implementation differences.PPP, PPP-AR, PPP-RTK, and regional augmentation services should not be treated as interchangeable without technical evidence.
Primary sources.
This briefing uses ESA Navipedia for the positioning method and the International GNSS Service for an operational real-time precise-products example. Commercial service performance and terminology require provider-specific verification.