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Deployment and Retrieval of Mineral Samplers

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Satellite- and epoch differenced precise point positioning based on a regional augmentation network.

Haojun Li¹, Junping Chen, Jiexian Wang

¹Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China. yanlhjch@126.com

Sensors (Basel, Switzerland)

|September 13, 2012

Summary

This summary is machine-generated.

This study introduces a new differential Precise Point Positioning (PPP) method using satellite and epoch differencing. This approach significantly reduces convergence time to centimeter-level accuracy in just two epochs.

Keywords:

SDED correction information differential precise point positioning regional augmentation

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Area of Science:

Geodesy and Geomatics
Satellite Navigation Systems

Background:

Precise Point Positioning (PPP) offers user positioning but faces challenges in convergence time.
Traditional PPP methods (NORM-PPP) rely on resolving ambiguities, often taking 15-20 minutes.
Receiver type dependency and complex modeling affect NORM-PPP efficiency.

Purpose of the Study:

To develop a faster and more efficient PPP approach by minimizing convergence time.
To overcome the limitations of traditional ambiguity resolution in PPP.
To achieve centimeter-level positioning accuracy with minimal data epochs.

Main Methods:

Implemented a satellite- and epoch-differenced (SDED) approach for differential PPP.
Eliminated receiver clocks and ambiguity parameters to simplify modeling.
Utilized a regional augmentation network for tropospheric delay and un-modeled error corrections.
Applied Robust estimation to enhance mathematical properties of the differenced data.

Main Results:

Achieved centimeter-level PPP positioning accuracy using only two epochs of data.
Demonstrated a 100% success rate for 10 cm accuracy with a 15-minute epoch interval.
Observed improved positioning Root Mean Square (RMS) with longer intervals (e.g., 15 min vs. 10 min).
RTK PPP achieved standard deviations of 0.80, 1.34, and 0.97 cm in North, East, and Up directions.

Conclusions:

The developed SDED-based PPP approach significantly reduces convergence time compared to NORM-PPP.
Regional augmentation and robust estimation enhance the reliability and accuracy of the differential PPP method.
This technique offers a highly efficient solution for real-time, high-accuracy positioning applications.