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Searching for Determinism in Mobile Gravimetry Data

Przyborski Marek, Serafin Marcin, Załęska-Fornal Agata, Pyrchla Jerzy, Pyrchla Krzysztof, Szulwic Jakub, Rudnicki Jacek

Polish Maritime Research

2025

nr 4

150-156

The accuracy of gravimetric measurements is essential in various fields, from the safety of the navigation of unmanned autonomous vessels to searching for natural resources to the level of underground water to the accuracy of geodetic data. Usually, we have to deal with measurements contaminated by environmental noise, as well as noise generated by different mechanical devices, city transportation systems, and human beings; some of those sources have a periodical nature. In the presented article, we consider the problem of the influence of noise on registered data. A gravimeter is, in fact, a vibration analyzer, so most of the artificial noise caused by engines, machines, and other technical systems is included in the final recorded data. By testing a statistical hypothesis, we try to convince the reader that in recorded time series, there is other information that is deterministic in nature and may have an important impact on the analysis of gravimetric data.

Accuracy of marine gravimetric measurements in terms of geodetic coordinates of land reference benchmark

Pyrchla Krzysztof, Łapiński Kamil, Szulwic Jakub, Jurczak Wojciech, Przyborski Marek, Pyrchla Jerzy

Eksploatacja i Niezawodność

2024

Vol. 26, no. 3

art. no. 188592

The article presents how the values of (3D) coordinates of land reference points affect the results of gravimetric measurements made from the ship in sea areas. These measurements are the basis for 3D maritime inertial navigation, improving ships' operational safety. The campaign verifying the network absolute point coordinates used as a reference point for relative marine gravity measurements was described. The obtained values were compared with catalogue values. In verification of network points 3D position the satellite data Global Satellite Navigation System (GNSS) and ground supporting systems (GBAS) was used. In this example, the height difference of the land reference point was 0.32 m. As a consequence, the offset budget of the marine campaign was affected in the range of up to 0.35 mGal. The influence on gravity free-air anomaly was not constant over the entire area covered by the campaign.