Author(s)

Wei Wu^*, Jiwei Ma

Affiliation(s)

School of Engineering, Qinghai Institute of Technology, Xining 810016, Qinghai, China.

Corresponding Author

Wei Wu

ABSTRACT

This study analyzes 1,611 days of GNSS data from the LHAZ IGS station on the Qinghai–Tibet Plateau (2018–2022). Daily coordinate time series were derived using GAMIT, followed by outlier removal and spline interpolation. Multi-resolution denoising was performed with DWT, CWT, and MODWT. Results show westward X displacement, minor Y fluctuations, and ~3 mm/year Z uplift with periodic variations. MODWT achieved the best denoising, outperforming DWT and CWT. MODWT is recommended for full 3D time series, while DWT suffices for horizontal-only applications. This study provides robust technical support for GNSS time series analysis on the Qinghai–Tibet Plateau.

KEYWORDS

Wavelet transform; CORS station; GNSS processing; Coordinate time series; Noise analysis

CITE THIS PAPER

Wei Wu, Jiwei Ma. Comparative study of different wavelet transform methods for GNSS coordinate time series on the Qinghai–Tibet Plateau. Frontiers in Environmental Research. 2025, 3(3): 38-43. DOI: https://doi.org/10.61784/fer3037.

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