Investigation of background noise in the GNSS position time series using spectral analysis – A case study of Nepal Himalaya

• Autorzy: Ray Jagat Dwipendra , Vijayan M. Sithartha Muthu , Godah Walyeldeen , Kumar Ashok

Identyfikatory

DOI

10.24425/gac.2019.128468

• Języki publikacji: EN

Abstrakty

EN

Position time series from permanent Global Navigation Satellite System (GNSS) stations are commonly used for estimating secular velocities of discrete points on the Earth’s surface. An understanding of background noise in the GNSS position time series is essential to obtain realistic estimates of velocity uncertainties. The current study focuses on the investigation of background noise in position time series obtained from thirteen permanent GNSS stations located in Nepal Himalaya using the spectral analysis method. The power spectrum of the GNSS position time series has been estimated using the Lomb–Scargle method. The iterative nonlinear Levenberg–Marquardt (LM) algorithm has been applied to estimate the spectral index of the power spectrum. The power spectrum can be described by white noise in the high frequency zone and power law noise in the lower frequency zone. The mean and the standard deviation of the estimated spectral indices are […] for north, east and vertical components, respectively. On average, the power law noise extends up to a period of ca. 21 days. For a shorter period, i.e. less than ca. 21 days, the spectra are white. The spectral index corresponding to random walk noise (ca. –2) is obtained for a site located above the base of a seismogenic zone which can be due to the combined effect of tectonic and nontectonic factors rather than a spurious monumental motion. Overall, the usefulness of investigating the background noise in the GNSS position time series is discussed.

Słowa kluczowe

EN

GNSS; background noise; position time series; spectral analysis

PL

GNSS; szereg czasowy; analiza spektralna

• Wydawca: Komitet Geodezji PAN
• Czasopismo: Geodesy and Cartography
• Rocznik: 2019
• Tom: Vol. 68, no. 2
• Strony: 375--388
• Opis fizyczny: Bibliogr. 42 poz., rys., tab., wykr.

Twórcy

autor

Ray Jagat Dwipendra

• Institute of Geodesy and Cartography, 27 Modzelewskiego St., 02-679, Warsaw, Poland

autor

Vijayan M. Sithartha Muthu

• CSIR -Fourth Paradigm Institute, NAL Belur campus, Wind Tunnel Road, 560 037, Bangalore, Karnataka, India

autor

Godah Walyeldeen

• Institute of Geodesy and Cartography, 27 Modzelewskiego St., 02-679, Warsaw, Poland

autor

Kumar Ashok

• Department of Physics, Tezpur University, 784028, Napaam, Assam, India

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020)