Coordinate Analysis of Latvian CORS Stadions

Balodis, Jānis; Varna, Inese; Haritonova, Diāna; Morozova, Katerīna

doi:10.22364/bjmc.2019.7.4.05

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…The Global Navigation Satellite System-Continuously Operating Reference Station (GNSS -CORS) network stations that are designed with excellent spatial density and distribution are used for various geodetic and non-geodetic applications [1][2][3][4][5]. The estimation of seasonal changes of CORS positions plays an extremely important role, since it can impact the final estimates, particularly the site velocity [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Implication between Geophysical Events and the Variation of Seasonal Signal Determined in GNSS Position Time Series

et al. 2021

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The seasonal signal determined by the Global Navigation Satellite System (GNSS), which is captured in the coordinate time series, exhibits annual and semi-annual periods. This signal is frequently modelled by two periodic signals with constant amplitude and phase-lag. The purpose of this study is to explore the implication of different types of geophysical events on the seasonal signal in three stages—in the time span that contains the geophysical events, before and after the geophysical event, but also the stationarity phenomena, which is analysed on approximately 200 reference stations from the EPN network since 1995. The novelty of the article is demonstrated by correlating three different types of geophysical events, such as earthquakes with a magnitude greater than 6° on the Richter scale, landslides, and volcanic activity, and analysing the variation in amplitude of the seasonal signal. The geophysical events situated within a radius of 30 km from the epicentre showed a higher seasonal value than when the timespan did not contain a geophysical event. The presence of flicker and random walk noise was computed using overlapping Hadamard variance (OHVAR) and the non-stationary behaviour of the time series of the CORS coordinates in the time frequency analysis was done using continuous wavelet transform (CWT).

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Section: Introductionmentioning

confidence: 99%

Implication between Geophysical Events and the Variation of Seasonal Signal Determined in GNSS Position Time Series

et al. 2021

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“…Attempts to characterise land uplift effect in Latvia by analysing precise levelling data have been made earlier [13,14]. Latvian continuously operating reference station (CORS) rates (or velocities) has been previously analysed [15,16] and have shown that GIA effect rates up to about 2 mm/yr in the vertical direction in the north-western part of Latvia. However, no detailed analysis of seasonal variations and noise characteristics of the Latvian CORS have been performed up till now.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of seasonal variations and noises of the daily double-difference and PPP solutions

Maciuk

Varna

2020

Journal of Applied Geodesy

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Long term GNSS observations provided by networks of the continuously operating reference stations (CORS) allow for determination of the global and local tectonic plate movements and seasonal variations. In recent years, PPP (Precise Point Positioning) technique has become increasingly popular and most likely in the future will replace relative positioning with CORS stations. In this paper, we discuss the difference of the velocity and seasonal component estimates of 25 Latvian CORS stations on the basis of daily PPP solutions from the Nevada Geodetic Laboratory and double-difference solutions from the Institute of Geodesy and Geoinformatics of the University of Latvia. Time series of each coordinate component for 9-year time period were determined by the usage of the Tsview software and seasonal existence of linear, annual, semi-annual factors and their uncertainties were determined. Breaks (e. g., antenna and receiver changes) were also taken into account. We then assessed the noise characteristics of these time series with the use of overlapping Hadamard variance (OHVAR). The result shows that OHVAR is computationally cheap, and the dominating power-law noise, including flicker and random walk. However Hadamard deviation of the PPP and double-difference solutions scatters differently for a whole year averaging time due to the different GNSS data strategies.

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Coordinate Analysis of Latvian CORS Stadions

Cited by 2 publications

References 2 publications

Implication between Geophysical Events and the Variation of Seasonal Signal Determined in GNSS Position Time Series

Implication between Geophysical Events and the Variation of Seasonal Signal Determined in GNSS Position Time Series

Characteristics of seasonal variations and noises of the daily double-difference and PPP solutions

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