Error Compensation Device and Method for Gravity Gradient Meter of Rotational Base Rotational Accelerometer

Abstract

Disclosed are a device and method for compensating for an error of a moving-base rotating-accelerometer gravity gradiometer. A signal of the gravity gradiometer before demodulation is compensated by calculating an angular motion error, a linear motion error, and a self-gradient of the gravity gradiometer according to the detected angular motion, linear motion, attitude angle of the gravity gradiometer, and based on an analytic model and a self-gradient model of the gravity gradiometer, and performing quadrature amplitude modulation of the angular motion error, the linear motion error, and the self-gradient. The present invention not only compensates for the angular motion error, the linear motion error, and the self-gradient in an output signal of the gravity gradiometer, but also solves the problems of over-voltage damage and over-voltage saturation of a conditioning circuit at a front end of the gravity gradiometer caused by the angular motion, the linear motion, and the self-gradient of the gravity gradiometer. The compensated signal of the gravity gradiometer is used to feedback and regulate a linear motion error transfer coefficient, an angular motion error transfer coefficient, and an accelerometer scale coefficient, and the influence of environmental factors, such as the temperature and magnetic fields, on the error transfer coefficients of the gravity gradiometer can be offset.

Description

technical field [0001] The invention relates to an error compensation device and method for a gravity gradiometer of a rotating base rotating accelerometer, and belongs 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 national defense and civilian value. 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 in foreign countries mainly include rotating accelerometer gravity gr...

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

At the same time, the linear motion, self-gradient, and angular motion of the gravity gradiometer will cause overvoltage saturation or damage to the signal conditioning circuit at the front end of the gravity gradiometer.

The present invention provides a device and method capable of compensating gravity gradiometer line motion error, angular motion error and self-gradient in real time. At present, there is no public report about the gravity gradiometer line motion error, angular motion error real-time compensation device and technology

Images