Self-calibration method and system for two-shaft frame type pendulous accelerometer

Abstract

The invention discloses a self-calibration method and system for a two-shaft frame type pendulous accelerometer. The method includes: rotating two frames of the accelerometer to enable an eccentric pendulum of the accelerometer to be positioned at six positions respectively, and acquiring torque measurement values at the six positions; solving apparent accelerations of the base in three orthogonaldirections according to the torque measurement values at the six positions; according to the apparent accelerations, the torque measurement values and a gravitational acceleration, calculating to obtain calibrated inner frame shaft pendulosity and calibrated outer frame shaft pendulosity; calculating to obtain a constant disturbance torque according to the torque measurement values; feeding backthe calibrated inner and outer frame shaft pendulosity and the constant disturbance torque to an error model in an operating state of the accelerometer to perform compensation calculation to obtain X-axial and Y-axial apparent acceleration components of the base, so that accuracy in acceleration measurement is improved. Pendulosity changes and zero offset of the accelerometer can be effectively separated out, and long-term stability and precision in use of the accelerometer are improved.

Description

technical field [0001] The invention belongs to the technical field of aviation and aerospace for high-precision apparent acceleration measurement, and in particular relates to a self-calibration method and system for a two-axis frame pendulum accelerometer. Background technique [0002] The pendulum-type accelerometer consists of a single pendulum composed of a detection mass, which makes angular motion around the output axis under the action of acceleration. Common pendulum accelerometers include jewel-supported accelerometers, liquid-floating pendulum accelerometers, and flexible pendulum accelerometers. In high-precision inertial stabilization platforms, quartz flexible pendulum accelerometers and pendulum integrating gyro accelerometers are mainly used at present. Since the pendulum plates of these pendulum accelerometers only contain angular motion degrees of freedom in one direction, they are all single-degree-of-freedom accelerometers, that is, each accelerometer ca...

AI Technical Summary

Problems solved by technology

In order to solve the above problems, there are reports on three-combination accelerometers at home and abroad. The focus is that the three accelerometers use the same magnetic steel to ensure that the change process of the torquer is consistent with time, but the disadvantage of this solution is that the pendulum plate is still 3 independent components, the zero bias in the 3 directions cannot be guaranteed to be consistent, which restricts the practical application of the three-combination accelerometer

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