A device and method for measuring magnetic vector sensitivity of accelerometer model parameters

Abstract

The invention discloses a device and method for measuring the magnetic vector sensitivity of an accelerometer model parameter. The device comprises: a fixedly connected acceleration generation module and a magnetic field generation module, the acceleration generation module provides the accelerometer with variable and quantifiable acceleration input; the magnetic field The generation module provides the accelerometer with a variable and stable magnetic field environment; when the acceleration generation module is used, the magnetic field generation module has the same pose change, so that the magnetic field environment of the accelerometer to be measured remains unchanged when the input acceleration changes. By keeping the spatial angular relationship between the direction of the magnetic vector generated by the magnetic field generating device and the accelerometer testing device unchanged, the invention ensures that the angular relationship between the sensitive axis of the accelerometer and the direction of the magnetic field remains unchanged during the detection process; When the acceleration of each axis of the accelerometer is input, the magnetic field environment where each axis of the accelerometer is located does not change, which avoids the error caused by the change of the relative magnetic field direction of the accelerometer.

Description

technical field [0001] The invention belongs to the technical field of accelerometer testing, and more particularly, relates to a device and a method for measuring the sensitivity of a magnetic vector of an accelerometer model parameter. Background technique [0002] Accelerometer is an inertial instrument that detects the acceleration of object movement. It is widely used in inertial navigation guidance, microseismic measurement, precision gravity measurement and so on. The magnetic sensitivity of the accelerometer represents the physical quantity affected by the external environmental magnetic field on the accelerometer, and is used to characterize the influence of the unit magnetic field strength on the output of the accelerometer, which will directly affect the authenticity of the accelerometer detection signal. When the accelerometer is applied, if its magnetic sensitivity is high, the target signal may be submerged by the output signal caused by the magnetic field chan...

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Problems solved by technology

[0005] For the defects of the prior art, the present invention provides a method for measuring the magnetic vector sensitivity of the accelerometer model parameters, the purpose of which is to separate the magnetic vector sensitivity of the accelerometer model parameters, aiming to solve the low frequency drift of the accelerometer in the prior art, Factors such as environmental noise and changes in the direction of the geomagnetic field relative to the accelerometer interfere with the test results, resulting in low separation accuracy

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