High-precision ocean gravity measurement gravity base point reading correction method

Abstract

The invention discloses a high-precision ocean gravity measurement gravity base point reading correction method. The method comprises the steps of: carrying out height correction, middle water layer correction, north-south distance correction of a gravimeter and a base point, and earth tide correction on the gravity reading of the base point, and obtaining the gravity reading of the gravity base point. According to the high-precision ocean gravity measurement gravity base point reading correction method provided by the invention, the reading of a gravimeter is returned to a reference surface position (the projection position of the gravity base point on a reference surface) right below the gravity base point, so that various correction physical meanings are clearer, the comparison precision of the gravity base point can be effectively improved, and the method is worthy of popularization and application.

Description

technical field [0001] The invention is applied to the fields of marine geophysics, marine surveying and mapping, marine geological survey and the like, and is especially applied to high-precision marine gravity measurement. Background technique [0002] Ocean gravity measurement is an important means of ocean geophysical survey and ocean mapping. [0003] Ocean gravimetry is used not only for marine geology studies, but also for studies of the Earth's shape to refine the geoid. In military terms, gravity data can be used for orbit calculation and inertial navigation of spacecraft, improving the hit rate of long-range missiles. [0004] The correction of the base point reading of marine gravity measurement is a necessary work. Generally, the base point gravity reading correction is carried out according to the marine gravity survey specification, including height correction and intermediate water layer correction. The height correction of the gravity base point reading is c...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned gravity base point reading correction formula (1) has certain deficiencies for high-precision gravity measurement. It does not return the gravimeter reading to the datum position directly below the gravity base point (the gravity base point is at the projection position of the datum plane), and does not make a solid Therefore, how to improve the formula (1) to improve the measurement accuracy is a technical problem that urgently needs to be solved by those skilled in the art

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