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Abstract

The effect of datum definition changes on the estimated station horizontal velocity vectors by using Bernese software, version 5.0 have been studied for the case of a Bulgarian GNSS station network. The least squares method with minimum constraint conditions as a method for GNSS data processing has been briefly presented. Five slightly more or less different datums defined by different combinations of involved IGS reference stations have been applied in the combined solutions of GPS data processing. The magnitude of the obtained BULiPOS horizontal station velocities varies from 0,2mm/yr up to 3,8mm/yr. Comparison of the horizontal station velocities shows differences between all five cases almost the same magnitude of 0,4÷0,6mm/yr for the majority of the stations. For the stations with slow movements (0,2÷0,6mm/yr) these differences are comparable with the size of velocities themselves and the effect is significant. The case study of the Bulgarian GNSS BULiPOS network processed by applying the least squares method with minimum constraint conditions shows that changes in datum definition result different estimations of the station velocities and the effect is very important and significant in combined use of velocities from different sources as input data in geotectonic and geophysical investigations and interpretations.

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/content/papers/10.3997/2214-4609.20131723
2013-10-07
2024-03-29
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20131723
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