Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 4, pp. 28-37
Comparison of GLONASS and GPS data by differential positioning method in static mode for solving geodynamic problems
O.N. Galaganov
1 , T.V. Guseva
1 , I.S. Krupennikova
1 1 O.Yu. Schmidt Institute of Physics RAS, Moscow, Russia
In the studies of recent movements of the earth crust on the geodynamic test sites using global navigation satellite systems, both GLONASS (Russia) and GPS (USA) signals are recorded. However, mainly GPS data are used in the processing due to large errors in coordinates determined from GLONASS data and the disparity between the coordinates obtained by the two systems. Here, the results of the analysis of precise satellite measurements by the method of differential positioning in static mode for solving geodynamic problems are presented. Data of simultaneous signal recording of GLONASS and GPS dual-system receivers at 34 points of local geodetic network in 2012 and 2013 are used. The duration of continuous measurement at the points ranged from 6 hours to four days. The processing was performed using Bernese 5.0 software. The dependence of the coordinates error on the duration of measurement was established as a power function. This dependence can serve as a criterion for the organization of geodynamic studies using GNSS measurements. The accuracy of coordinates determination using GLONASS data is up to 20% worse than using GPS data. Special attention is paid to the comparability analysis of coordinates in ITRF computed from GLONASS and GPS measurements. The differences of the coordinates determined from measurements up to 24 hours is ±10 mm, under adverse observational conditions – up to 30 mm. With the increase in measurement duration, the discrepancy between coordinates determined by different systems decreases to 5 mm.
Keywords: GLONASS, GPS, measurements, coordinates, location accuracy, duration of registration, distribution, approximation, comparison, criterion
Full textReferences:
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