A dynamic decoupling method and system for an accelerometer

A dynamic decoupling and accelerometer technology, applied in the testing/calibration of speed/acceleration/shock measurement equipment, speed/acceleration/shock measurement, instruments, etc., can solve large decoupling errors, poor real-time performance, decoupling The model is difficult to accurately estimate and other problems, achieving the effect of reducing complexity, reducing computing burden, and good applicability

CN108037317BInactive Publication Date: 2020-01-17CHINA UNIV OF GEOSCIENCES (WUHAN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-01-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a dynamic decoupling method and system for an accelerometer. The method includes the following steps that: the calibration-used data of the accelerometer are acquired, whereinthe calibration-used data contain input and output data at different frequencies under a condition that each axis is adopted as an input axis, and the other axes are respectively taken as output axes;a coupling function between the axes is fitted according to the input and output data; and a calibrated output result is finally obtained according to the coupling function. According to the method of the present invention, the coupling function is processed in a segmented manner, so that the order of the coupling function can be lowered, and therefore, the complexity of decoupling can be decreased, and the amount of calculation is lower; and the calibration data are adopted as the input data of a dynamic fitting formula, which enables high applicability; solving operation that needs large computation amount only lies in the obtaining of constant coefficients in the coupling formula, and in actual decoupling, only the formula needs to be directly invoked, and therefore, the computation burden of a processor can be effectively reduced.
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Description

technical field

[0001] The present invention relates to the field of accelerometers, and more specifically, to a dynamic decoupling method and system for accelerometers. Background technique

[0002] Due to the influence of factors such as placement structure, process, and integration of multiple sensitive components, multi-component accelerometers have the problem of inter-dimensional coupling in actual use. The phenomenon of inter-dimensional coupling refers to a certain non-electrical physical quantity in a single direction. When functioning, the output signal should only be generated in the corresponding axial direction, and the phenomenon that the output signal is also generated in the conversion channel not in this axial direction.

[0003] The inter-dimensional coupling is incompletely linear. In some sensors, it is a single-increase / single-decrease nonlinearity, while some special sensors are multi-peak nonlinearity. The inter-dimensional coupling makes the multiple ...

Examples

Embodiment Construction

[0049] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings. The applicable accelerometer of the present invention is a three-component MEMS accelerometer, or the acceleration contained in a three-axis acceleration sensor, a three-dimensional torque sensor, a six-dimensional torque sensor, a multi-dimensional wheel force sensor, a three-dimensional force flexible tactile sensor, and a three-component geophone One of them will be selected as an illustration below.

[0050] Taking the three-component MEMS accelerometer as an example, for a certain input axis a and the corresponding output axis that is only affected by it in theory, u i For the input i axis amplitude, y j is the output j-axis amplitude, when no coupling occurs, there is y a = u a , and after adding the inter-dimens...