A linear motion error compensation device and method for a rotational accelerometer gravity gradiometer

Abstract

The invention discloses a compensating device and a method for line motion error of a rotary accelerometer and a gravity gradiometer. The device comprises a line motion detecting module, a reference signal generating module, a line motion error transmission coefficient processing module, a line motion error compensation signal generating module, and a self-gradient compensation signal generating module. The line motion detecting module detects the acceleration of the gravity gradiometer in real-time. The reference signal generating module generates a quadrature amplitude modulated carrier in real-time. The line motion error transmission coefficient processing module adjusts a line motion error transmission coefficient in real time according to a fed back and compensated gravity gradiometersignal. The line motion error compensation signal generating module generates a line motion error compensation signal according to the input gravity gradiometer acceleration signal, the quadrature amplitude modulated carrier, and the line motion error transmission coefficient. The self-gradient compensation signal generating module generates a self-gradient compensation signal according to the attitude of the gravity gradiometer. The method compensates before the demodulation of the gravity gradiometer signal, which can compensate the line motion error and the self-gradient of the gravity gradiometer, and can solve the problem of overvoltage circuit saturation and overvoltage circuit damage caused by the self-gradient and line motion error of the gravity gradiometer.

Description

technical field [0001] The invention relates to a linear motion error compensation device and method of a rotary accelerometer, a gravity gradiometer, 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 gradiome...

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 and self-gradient in real time. At present, there is no unpublished report about gravity gradiometer line motion error and self-gradient real-time compensation device and technology

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