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Reduction of Multipath Effect in GNSS Positioning by Applying Pseudorange Acceleration as Weight
Kwan-Dong Park1,2, Woong-Jun Yoon1, Jong-Sung Lee1
1Department of Geoinformatic Engineering, Inha University, 100 Inha-ro, Incheon 22212, Republic of Korea.
Sensors (Basel, Switzerland)
|November 9, 2024
Summary
This study introduces a new method using code pseudorange acceleration to improve Global Navigation Satellite System (GNSS) positioning accuracy in urban areas, significantly reducing multipath errors.
Area of Science:
- Geomatics Engineering
- Satellite Navigation Systems
- Signal Processing
Background:
- Multipath effect is a primary error source in urban Global Navigation Satellite System (GNSS) positioning.
- Reflected GNSS signals cause significant variations in pseudorange measurements, impacting accuracy.
Purpose of the Study:
- To propose and evaluate a novel approach for mitigating GNSS multipath errors in urban environments.
- To enhance positioning accuracy by utilizing code pseudorange acceleration measurements.
Main Methods:
- Code pseudorange acceleration measurements were used as weights in a least squares estimation process.
- Range acceleration (RA) and signal-to-noise ratio (SNR) thresholds were applied to filter multipath-affected signals.
Main Results:
- Positioning accuracy improved by 75% horizontally and 79% vertically using the proposed weighting method.
- Applying both RA and SNR thresholds further enhanced accuracy by over 80% in both directions at test sites, including deep urban areas.
Conclusions:
- Code pseudorange acceleration is an effective metric for mitigating GNSS multipath errors.
- Combining RA with SNR thresholding offers a robust solution for high-accuracy GNSS positioning in challenging urban environments.
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