Gravity-gradiometer self-calibration method and gravity-gradiometer centrifugal gradient compensation method

Abstract

The invention discloses a gravity-gradiometer self-calibration method and a gravity-gradiometer centrifugal gradient compensation method. The gravity-gradiometer self-calibration method includes: changing sensitive centrifugal gradient of a gravity gradiometer by changing level elevation angle of the gravity gradiometer or rotational angular velocity of an inertial stabilization platform, recording centrifugal gradient data of output and detection of the gravity gradiometer under different centrifugal gradient excitation and completing calibration of scale coefficient and zero deviation of thegravity gradiometer; acquiring the gravity gradient data with centrifugal gradient according to output of a calibration model and the gravity gradiometer, and subtracting the gravity gradient data from the detected centrifugal gradient to achieve centrifugal gradient compensation. The calibration method can be automatically operated through a computer, self-calibration is realized, calibration can be completely by only depending on the gravity gradiometer instead of external quality detection, and the calibration method is convenient, concise and easy to implement.

Description

technical field [0001] The invention relates to a self-calibration and centrifugal gradient compensation method of a rotational accelerometer gravity gradiometer, belonging to the technical field of precision measurement. Background technique [0002] The gravity gradient is the first-order derivative of the gravity field strength (gravity acceleration), and the second-order derivative of the gravity potential energy. Compared with the gravity acceleration vector, the gravity gradient can more abundantly describe the information of the gravity field and reflect the spatial variation of the gravity field source , modeling the Earth's gravitational field. It has been successfully applied in mineral exploration, auxiliary high-precision navigation, geological analysis, gravity field modeling and other fields. At present, the gravity gradiometers that have been put into commercial application in foreign countries mainly include rotational accelerometer gravity gradiometers, and...

AI Technical Summary

Problems solved by technology

This type of calibration method requires an external detection mass, and the mass and position of the detection mass body need to be artificially changed. The calibration process is complicated and the calibration efficiency is low.

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