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Method for simulating gravity gradient signals of gravity gradient meters of rotating accelerometers

A gravity gradiometer and rotational acceleration technology, which is applied in the field of gravity gradient signal simulation based on precision instruments to simulate the real system environment, can solve problems such as weak gradient signals, and achieve the effect of convenient verification and correctness verification

Active Publication Date: 2015-03-25
SOUTHEAST UNIV
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Problems solved by technology

The differential gravity gradiometer is not affected by the motion speed and acceleration of the gravimeter. In the actual gravity gradiometer system, the gradient signal is very weak, which poses a serious challenge to the gravity gradient sensor, signal conditioning, noise suppression and other technologies.

Method used

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  • Method for simulating gravity gradient signals of gravity gradient meters of rotating accelerometers
  • Method for simulating gravity gradient signals of gravity gradient meters of rotating accelerometers
  • Method for simulating gravity gradient signals of gravity gradient meters of rotating accelerometers

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0030] Rotational accelerometer gravity gradiometer measurement principle such as figure 1 As shown, the four accelerometers are installed on the rotating disk orthogonal to each other, the sensitive axes of the accelerometers are tangent to the edge of the disk, and the directions of the sensitive axes of the two relative accelerometers are opposite. figure 2 is the working diagram of the simulation system, image 3 is a schematic diagram of the dynamic demodulation of the gradient signal, Figure 4 It is the workflow flow chart of the simulation system, and the specific process steps are as follows:

[0031] 1) The computer initializes all the parameters. The parameters mainly include: the accelerometer data file that needs to be tested and simulated, the accelerometer scale factor and zero offset, the distance from the center of mass of the acceleromete...

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Abstract

The invention discloses a method for simulating gravity gradient signals of gravity gradient meters of rotating accelerometers. The method includes the steps that gravitation acceleration signals inducted by the four accelerometers on a disc are calculated according to a universal gravitation formula, the four sets of acceleration signals are added to various error data, the calculated acceleration data containing errors are transmitted to an analog-digital converter through a computer, then, one-frequency-doubling demodulation and fixed frequency signal demodulation are conducted on addition signals and subtraction signals respectively through current-to-voltage signal conversion, voltage amplification and addition and subtraction operation, whether accelerometer scale factors need to be adjusted or not is judged according to a demodulation result, if the demodulation result meets the requirement, two-frequency-doubling gradient demodulation is conducted on total output signals of a simulation system, and then gravity gradient values are acquired. By the adoption of the method, signal characteristics, parameter adjustment, error compensation and signal processing of the gravity gradient signals of the gravity gradient meters of the rotating accelerometers can be researched in details.

Description

technical field [0001] The invention relates to a gravity gradient signal simulation method of a rotational accelerometer gravity gradiometer, in particular to a gravity gradient signal simulation method for simulating a real system environment based on precision instruments. Background technique [0002] The earth's gravitational field reflects the distribution and composition information of the earth's interior materials, and the material distribution can be inverted by accurately measuring the earth's gravitational field. High-precision gravity gradient measurement is of great significance to the development of space science, earth science, geological science, and inertial navigation. At the same time, gravity gradient measurement is considered to be one of the most effective means of resource exploration. Basic geological research, geodesy, exploration of oil and gas mineral resources and other fields have important application prospects. Airborne gravity gradient measur...

Claims

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Application Information

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IPC IPC(8): G01V13/00
Inventor 蔡体菁钱学武丁昊
Owner SOUTHEAST UNIV
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