Geophysical research: article

V.N. Koneshov 1,2 P.S. Mikhailov 1,2 V.V. Dorozhkov 2
1 Schmidt Institute of Physics of the Earth, the Russian Academy of Sciences 2 Vladimir State University named after Alexander and Nikolay Stoletov
Journal: Geophysical research
Tome: 24
Number: 4
Year: 2023
Pages: 43-57
UDK: 550.831.015: 550.831.3: 528.27
DOI: 10.21455/gr2023.4-3
Full text
Keywords: Earth's gravitational field, gravity anomalies, potential field navigation.
Аnnotation: The article is devoted to the theoretical research and justification of the method for determining the location of the carrier as a moving object, as well as its motion parameters along the gravimetric profile and the map of the Earth's gravity field anomalies, considered as a set of geophysical landmarks, taking into account the specifics of measurements performed by modern gravimetric complexes. The article considers such features of the gravitational field navigation as the presence of inertial inter-ference and the need to suppress it, the presence of systematic instrumental errors, as well as the very nature of calculations by inertial navigation systems. An analysis of the requirements for the structure of anomalies and the detail of the gravitational field representation, map errors and gravimetric profile errors are carried out. It is shown that with the use of gravity anomalies, solving the navigation problem is fundamentally possible only if the anomalous field differs from a second-order polynomial that exceeds the errors of the anomalies of the used gravimetric map. Taking into account the theoretical justification and practical experience of clarifying the coordinates of an object on a geophysical landmark, it was established that important components are not only the methods for solving the navigation problem, but also the characteristics of the field anomalies themselves along the mo-tion trajectory. To visually represent the number of zones of the global gravitational field with characteristics suitable for specifying the coordinates, an estimate of the areas of the World Ocean and separately the waters of the Arctic Ocean is given. The estimate was obtained from the zoning data of a high-degree global gravity field model, taking into account the value of the total horizontal gravity gradient. The resulting mutual ratio of the number of anomalies that satisfy the solution of the problem and those anomalies where the solution of the navigation solution is impossible shows the need for a careful study of the anomalous field of the ocean and its individual sections in relation to the creation of geophysical landmarks.
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