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A rotation accelerometer gravity gradiometer motion error after-event compensation method

A gravity gradiometer and rotational acceleration technology, which is applied in the field of precision measurement, can solve the problems of gravity gradiometer line motion error, high-order scale coefficient mismatch, measurement error, etc., and achieve the effect of reducing the accuracy requirement and simplifying the circuit

Active Publication Date: 2019-05-17
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0003] During the gravity gradient exploration of the moving base, due to the installation error of the accelerometer inside the gravity gradiometer, the first-order and higher-order scale coefficients of the accelerometer do not match, and the circuit gain does not match, etc., the acceleration, angular velocity, and angular acceleration of the gravity gradiometer are transmitted. to the output of the gravity gradiometer, causing measurement errors
Rotational accelerometer gravity gradiometer online error compensation, its compensation circuit and mechanical design are complex, and can only suppress the gravity gradiometer linear motion and angular motion errors to a certain extent, the residual gravity gradiometer linear motion error, angular motion error, Seriously affect the measurement accuracy of the gravity gradiometer, requiring post-event error compensation
There is currently no public report on the post-event compensation method for the motion error of the rotating accelerometer and the gravity gradiometer

Method used

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  • A rotation accelerometer gravity gradiometer motion error after-event compensation method
  • A rotation accelerometer gravity gradiometer motion error after-event compensation method
  • A rotation accelerometer gravity gradiometer motion error after-event compensation method

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Embodiment Construction

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

[0030] Such as figure 1 As shown, A1, A2, A3, and A4 are four accelerometers installed on the rotating accelerometer gravity gradiometer, which are gravitational gradient sensitive elements; the origin of the gravity gradiometer measurement coordinate system is located at the center of the disc, x m is the x-axis of the gravity gradiometer measurement coordinate system, y m is the y-axis of the gravity gradiometer measurement coordinate system, z m It is the z-axis of the gravity gradiometer measurement coordinate system; a three-axis accelerometer is installed at the center point of the gravity gradiometer rotating disk, and it is used to record the linear motion experienced by the gravity gradiometer during gravity gradient exploration; the gravity gradiometer measures the coordinates Gyroscopes are respectively installed on the three coordinate axes of t...

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Abstract

The invention discloses a rotation accelerometer gravity gradiometer motion error after-event compensation method, which comprises the following steps of recording the angular motion and the linear motion of a gravity gradiometer in the gravity gradient exploration of a movable base, and eliminating the angular motion and linear motion errors in output data of the gravity gradiometer based on a rotation accelerometer gravity gradiometer analytical model after the exploration is finished. According to the post-event motion error compensation method, under the condition that the precision of thegravity gradiometer is not changed, the requirement of the gravity gradiometer on the precision of an online error compensation system can be greatly reduced, so that the circuit and mechanical design of the rotary accelerometer gravity gradiometer is simplified, and the rotary accelerometer gravity gradiometer is simpler and is lower in cost.

Description

technical field [0001] The invention relates to a post-compensation method for the motion error of a rotary accelerometer and a gravity gradiometer, belonging to the technical field of precision measurement. Background technique [0002] Gravity gradient exploration of moving base is a low-cost, high-efficiency gravity gradient exploration method; it is currently the most advanced gravity field exploration method in the world. Gravity gradient data are widely used in geological analysis, gravity field modeling, high-precision navigation, resource exploration, etc. Gravity gradiometer has extremely important value in national defense, civilian use and scientific research. At present, the gravity gradiometers under research at home and abroad mainly include cold atom gravity gradiometers, superconducting gravity gradiometers, MEMS gravity gradiometers, etc. Gravity gradiometers that have been put into commercial application abroad mainly include rotational accelerometer grav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G01V7/00
CPCG01P21/00G01P15/18G01V7/06G06F18/30
Inventor 蔡体菁喻名彪
Owner SOUTHEAST UNIV
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