A Multipath Error Mitigation Method for GNSS Kinematic Single Epoch Positioning by Fusing Track Inspection Information

ZHANG Rui; XIONG Yongliang; LEI Fei

doi:10.13203/j.whugis20190268

Volume 46 Issue 6

Jun. 2021

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Geomatics and Information Science of Wuhan University > 2021 > 46(6): 905-912. > DOI: 10.13203/j.whugis20190268

ZHANG Rui, XIONG Yongliang, LEI Fei. A Multipath Error Mitigation Method for GNSS Kinematic Single Epoch Positioning by Fusing Track Inspection Information[J]. Geomatics and Information Science of Wuhan University, 2021, 46(6): 905-912. DOI: 10.13203/j.whugis20190268

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A Multipath Error Mitigation Method for GNSS Kinematic Single Epoch Positioning by Fusing Track Inspection Information

1.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
2.
China Electronics Technology Group Corporation No.10 Research Institude, Chengdu 610036, China

Funds:

The National Natural Science Foundation of China 41674028

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Author Bio:
ZHANG Rui, PhD candidate, specializes in the theories and applications of high precision GNSS data processing. E-mail: zhangry@my.swjtu.edu.cn
Corresponding author:
XIONG Yongliang, PhD, professor. E-mail: ylxiong@sina.com
Received Date: July 02, 2020
Published Date: June 04, 2021

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Abstract

Abstract

Objectives With the rapid development of China's high-speed rail technology, the external geometric parameters rapid extraction of high-speed railway is a new research topic. GNSS kinematic positioning has broad application prospects, but its accuracy is difficult to meet the requirements of track detection. Multipath effect is one of the main factors affecting the accuracy of GNSS kinematic positioning. At present, most of the existing multipath error reduction methods are suitable for static measurement, but there is no effective method to reduce the kinematic multipath error.
Methods The GNSS observation data are solved by using the traditional algorithm and the geometric information of track inspection as constraints, and then compared the measurement results affected by multipath with the accurate information of track inspection. Meanwhile, wavelet multi-scale analytical method is applied to separating the multipath error from the noise in the coordinate residual sequence, and the clean coordinate series is obtained.
Results The accuracy of the double difference model can be improved by about 19% in the east-west direction, 20% in the south-north direction and 18% in the elevation direction based on the constrained adjustment with the track longitudinal level. Reducing and eliminating the multipath effect and noise in the coordinate domain by wavelet multi-scale decomposition algorithm, the accuracy is improved about 19%-21% in the east-west direction, 15%-18% in the south-north direction, and 9%-20% in the elevation direction. The combination of track longitudinal level constraint adjustment and wavelet filtering can improve the positioning accuracy by 35% in the east-west direction, 31% in the south-north direction and 25% in the elevation direction.
Conclusions The multipath error and observation noise can be effectively extracted by combining track inspection information with GNSS data, the multipath error in coordinate domain can be further weakened by wavelet correlation analysis, and the accuracy of GNSS kinematic positioning can be improved to meet the requirements of high-speed track measurement.
- track inspection information,
- GNSS kinematic positioning,
- multipath error,
- coordinate domain,
- wavelet

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References

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A Multipath Error Mitigation Method for GNSS Kinematic Single Epoch Positioning by Fusing Track Inspection Information

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