PPP and RTK Fusion for High-Precision Trajectory and Positioning
2025-07-16
The integration of Precise Point Positioning (PPP) and Real-Time Kinematic (RTK) technologies marks a significant advancement in GNSS-based positioning. By combining both methods, users benefit from continuous, high-precision positioning, regardless of network availability or environmental conditions.
What is PPP and How Does It Complement RTK?
Precise Point Positioning (PPP) enables GNSS receivers to achieve high-accuracy positioning without relying on nearby reference stations. Instead, PPP utilizes satellite-based correction data, such as that broadcast by BeiDou and Galileo systems. In contrast, RTK depends on real-time corrections from base stations or GNSS networks to deliver centimeter accuracy.
Unlike RTK positioning which relies on local differential corrections methods, PPP use a “remote correction” + “terminal processing” model, making it particularly suitable for wide-area and long-distance operations. Satellite orbit and clock correction data are processed within the receiver to deliver near-centimeter-level accuracy.
Comparison Factor
NRTK Service
PPP Service
Positioning Accuracy
Centimeter-level (dependent on base station proximity)
Decimeter-level (approx. 20 cm)
Convergence Time
Seconds
10–30 minutes
Coverage Area
Limited to areas with dense base station networks
Global
Communication Method
Network-based
Satellite-based
Best Use Cases
Regions with stable network and base station access
Areas without base stations or network access
When Should You Use PPP?
PPP is not designed to replace NRTK but serves as a reliable backup offering global coverage and greater flexibility in areas lacking cellular connectivity or local GNSS base stations. It is especially beneficial in the following scenarios:
Remote Agricultural Fields: Ideal for areas without NRTK coverage, enabling automated navigation and machine guidance.
Open-Pit Mines: Effective in environments with unreliable radio signals, where continuous RTK positioning is disrupted.
Cross-Border Transport: Suitable for routes where frequent network switching affects RTK consistency.
Maritime Operations: Global PPP availability supports both offshore and coastal applications.
In these situations, PPP enhances operational stability and ensures consistent positioning performance without relying on traditional GNSS network infrastructure.
PPP Services Supported by CHCNAV CGI Series Receivers
CHCNAV’s CGI-610 and CGI-830 receivers support two main PPP correction services: PPP-B2b and E6-HAS.
PPP-B2b : Broadcast via the BeiDou B2b signal from three GEO satellites, this service provides orbit and clock corrections for GPS and BDS constellations. Coverage extends across China and surrounding regions.
E6-HAS : Transmitted via the Galileo E6-B signal, this global service provides corrections for both GPS and Galileo. It enables users to achieve decimeter-level accuracy without internet connectivity.
Activating PPP corrections on the CGI-610 and CGI-830 receivers is quick and easy. Users can connect to the device via Wi-Fi, access the relevant configuration menu and select PPP-B2b, E6-HAS or PPP/RTK adaptive mode, depending on their location and operational needs.
When using PPP-B2b or E6-HAS, it is recommended to remain stationary or in open terrain for 10–20 minutes to allow for positioning convergence. Successful convergence will be indicated in the PPP positioning status window of the receiver.
The PPP/RTK adaptive mode is especially useful in areas with unreliable differential signals, such as open-pit mines. It works by:
Defaulting to RTK positioning when network corrections are available, delivering centimeter-level accuracy within seconds.
Concurrently initializing PPP convergence in the background.
Comparing PPP and RTK results to ensure alignment and enable seamless switching.
Automatically switching to PPP when differential signals are lost for uninterrupted positioning.
The Future of PPP and Network RTK Integration
The next generation of GNSS positioning systems will further refine the fusion of PPP and RTK technologies through optimized algorithms and more sophisticated onboard intelligence in receivers.The CGI-610 and CGI-830 receivers already support adaptive PPP/RTK modes, providing continuous centimeter-level positioning based on the availability of real-time correction data.
In the future, space-ground fusion technologies such as CHCNAV's PointX correction services will further improve positioning accuracy. Dynamic selection of the most accurate correction source (NRTK or PPP) will enable smarter and more robust positioning solutions for industries such as transportation, surveying, mining, and agriculture.
For more information on PPP capabilities, evaluation opportunities, or tailored solutions, please visit the CHCNAV Inquiry page.
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About CHC Navigation
CHC Navigation (CHCNAV) develops advanced mapping, navigation and positioning solutions designed to increase productivity and efficiency. Serving industries such as geospatial, agriculture, construction and autonomy, CHCNAV delivers innovative technologies that empower professionals and drive industry advancement. With a global presence spanning over 140 countries and a team of more than 2,000 professionals, CHC Navigation is recognized as a leader in the geospatial industry and beyond. For more information about CHC Navigation [Huace:300627.SZ], please visit: www.chcnav.com
