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GPS/BDS triple-frequency cycle slip detection and repair based on moving window global search method
1School of Engineering, Yunnan College of Business Management, Kunming, 650500, China.
Scientific Reports
|March 20, 2024
Summary
This study introduces an effective method for detecting and repairing Global Navigation Satellite System (GNSS) cycle slips using triple-frequency data from GPS and BDS satellites. The new approach significantly improves accuracy and reliability in satellite navigation positioning.
Area of Science:
- Geodesy and Geomatics
- Satellite Navigation Systems
Background:
- Accurate Global Navigation Satellite System (GNSS) data processing relies on precise cycle slip detection and repair.
- Triple-frequency observations from Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS) offer enhanced capabilities over dual-frequency systems.
Purpose of the Study:
- To develop and validate a novel moving window global search method for detecting and repairing triple-frequency cycle slips in GNSS data.
- To enhance the accuracy and reliability of GNSS positioning by addressing cycle slip ambiguities.
Main Methods:
- A moving window global search algorithm utilizing geometry-free (GF) models with combined coefficients to mitigate ionospheric effects.
- Employing a "3 sigma" criterion for range constraint and updating standard deviation within the moving window for cycle slip estimation.
- Global search strategy to identify and correct triple-frequency cycle slips, avoiding multi-value issues.
Main Results:
- The proposed method successfully determined the position and magnitude of triple-frequency cycle slips across five experimental datasets.
- Achieved high detection success rates: 98.0-100.0% for GPS and 92.0-100.0% for BDS.
- Demonstrated average detection rates of 99.2% for GPS and 96.7% for BDS, surpassing the direct rounding method and effective for slips within 2 cycles.
Conclusions:
- The moving window global search method provides a robust and accurate solution for triple-frequency GNSS cycle slip detection and repair.
- This technique offers significant improvements in reliability and accuracy compared to existing methods, particularly for small cycle slips.
- The study validates the effectiveness of triple-frequency observations in advancing GNSS data processing precision.
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