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Multi-frequency gravity gradient excitation signal generation method

A technology of excitation signal and gravity gradient, applied in the field of precision measurement, can solve problems such as testing requirements that cannot meet performance indicators

Active Publication Date: 2018-01-30
SOUTHEAST UNIV
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Problems solved by technology

[0003] The gravity gradiometer has a certain signal bandwidth. If the test mass static excitation method is adopted during the test, the gravity gradient excitation signal generated by this method is a 0 frequency constant value signal, which cannot meet the requirements of the gravity gradiometer design bandwidth outside the 0 frequency. Test requirements for performance indicators

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  • Multi-frequency gravity gradient excitation signal generation method
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  • Multi-frequency gravity gradient excitation signal generation method

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0032] Such as figure 1 As shown, the multi-frequency gravity gradient excitation signal can be obtained by simultaneously rotating multiple proof masses around the gravity gradiometer at different angular velocities and different orbits.

[0033] In this embodiment, a method for generating a multi-frequency gravity gradient excitation signal uses N=6 different detection masses to rotate around the gravity gradiometer at the same time in different orbits and different angular velocities to generate a gravity gradient excitation signal with 10 frequency components, including The following steps:

[0034] 1) Establish the rotating detection mass fixed coordinate system b: as figure 2 As shown, the angle between the circular orbit plane of the proof mass rotation and the input plane of the gravity gradiometer is (θ x , θ y ), rotate the gravity gradiometer ...

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Abstract

The invention discloses a multi-frequency gravity gradient excitation signal generation method which generates a multi-frequency gravity gradient excitation signal by superposition by enabling multiple detection weights to simultaneously revolve around a gravity gradiometer at different angular velocities and in different circular orbits. By changing the mass, the number, the orbit radiuses, and the orbit planes of the detection weights and the angle of the input plane and the rotational angular velocity of the gravity gradiometer, the frequency components and magnitudes of the multi-frequencygravity gradient excitation signal can flexibly controlled. The theoretical value of the multi-frequency gravity gradient excitation signal generated by the method is known. According to a theoretical multi-frequency gravity gradient excitation signal and the signal actually output by the gravity gradiometer, the scale coefficient of the gravity gradiometer can be calibrated, and the performanceof the gravity gradiometer can be tested and evaluated.

Description

technical field [0001] The invention relates to a method for generating a multi-frequency gravity gradient excitation signal, which belongs 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 the gravity gradiometers with ap...

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Application Information

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IPC IPC(8): G01V7/00G01V13/00
Inventor 蔡体菁喻名彪
Owner SOUTHEAST UNIV
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