GPS measurements are often affected by errors. This is mainly due to the fact that GPS signals need to pass through the atmospheric layers and this gives rise to unpredictable delays. In this paper we introduce M-DGPS, a novel algorithm to post-processing correct geodetic tracks by means of data coming from multiple DGPS stations. The main idea of M-DGPS is to use a set of DGPS stations as Voronoi generators to define the area of influence of a station. The algorithm uses the error of each available station, in a weighted manner, to estimate the error of the point to be corrected. We apply M-DGPS over the RINEX data files of the GPS stations of the Neapolitan Volcanoes Continuous GPS (NeVoCGPS) network of Vesuvius Observatory to build an error dataset. We show that close stations are affected by similar errors. The correction ratio of the proposed M-DGPS, better than the DGPS standard approach, appears attractively good, suggesting interesting developments of this technique.
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