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Multi-GNSS PPP-RTK: From Large- to Small-Scale Networks.

Nandakumaran Nadarajah¹, Amir Khodabandeh², Kan Wang³

¹GNSS Research Centre, Department of Spatial Sciences, Curtin University, Perth, WA 6845, Australia. N.Nadarajah@curtin.edu.au.

Sensors (Basel, Switzerland)

|April 4, 2018

Summary

This summary is machine-generated.

Integrating multiple Global Navigation Satellite Systems (GNSS) significantly speeds up Precise Point Positioning-Real-Time Kinematic (PPP-RTK) convergence. Multi-GNSS PPP-RTK achieves centimeter-level accuracy faster than single-GNSS, especially with integer ambiguity resolution.

Keywords:

Global Navigation Satellite Systems (GNSS)PPP-RTK network and user carrier phase ambiguity resolution ionosphere weighted model network in-loop

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Area of Science:

Geodesy
Satellite Navigation
Geophysics

Background:

Precise Point Positioning (PPP) and PPP-Real-Time Kinematic (PPP-RTK) are advanced GNSS positioning techniques.
Integrating multiple GNSS constellations (e.g., GPS, BeiDou, Galileo) offers potential improvements in positioning accuracy and convergence time.

Purpose of the Study:

To numerically investigate the impact of multi-GNSS integration on fast, high-precision PPP-RTK positioning.
To quantify the reduction in convergence time using combined GNSS data compared to single-GNSS.

Main Methods:

Utilized the Curtin PPP-RTK software to process datasets from GPS, BeiDou Navigation Satellite System (BDS), and Galileo.
Processed data from both large-scale (Australia-wide) and small-scale (inter-station distances < 30 km) networks.
Compared positioning performance using stand-alone and combined multi-GNSS configurations, including ambiguity-float and single-receiver ambiguity resolution.

Main Results:

For an Australia-wide GPS-only ambiguity-float setup, 90% of horizontal positioning errors (kinematic mode) reached < 5 cm after 103 minutes.
Integrating GPS + BDS + Galileo reduced this convergence time to 66 minutes.
Applying single-receiver ambiguity resolution further decreased the convergence time to 15 minutes.

Conclusions:

Multi-GNSS integration substantially accelerates convergence time for high-precision PPP-RTK positioning.
The benefits of multi-GNSS are evident across different network scales and receiver types.
Single-receiver ambiguity resolution is a key factor in achieving rapid centimeter-level positioning with PPP-RTK.