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Simulation Method of Gravity Gradient Signal of Rotational Accelerometer Gravity Gradient

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

Active Publication Date: 2017-09-26
SOUTHEAST UNIV
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  • Abstract
  • Description
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AI Technical Summary

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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  • Simulation Method of Gravity Gradient Signal of Rotational Accelerometer Gravity Gradient
  • Simulation Method of Gravity Gradient Signal of Rotational Accelerometer Gravity Gradient
  • Simulation Method of Gravity Gradient Signal of Rotational Accelerometer Gravity Gradient

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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 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 between the accelerometer detection mass center...

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Abstract

The invention discloses a gravity gradient signal simulation method of a rotating accelerometer gravity gradiometer. The gravitational accelerometer signals sensed by four accelerometers on a disc are calculated according to the universal gravitational formula, and the four groups of acceleration signals are respectively added to various error data. , the computer sends the calculated acceleration data containing errors to the analog-to-digital converter, and then undergoes current-to-voltage signal conversion, voltage amplification, and addition and subtraction operations to perform 1-fold frequency demodulation and fixed-frequency signal on the addition signal and subtraction signal respectively. For demodulation, judge whether to adjust the accelerometer scale factor according to the demodulation result. If the demodulation result meets the requirements, perform 2 times frequency gradient demodulation on the total output signal of the simulation system to obtain the gravity gradient value. Through the invention, the signal characteristics, parameter adjustment, error compensation and signal processing method of the rotary accelerometer gravity gradiometer can be studied in detail.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G01V13/00
Inventor 蔡体菁钱学武丁昊
Owner SOUTHEAST UNIV
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