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Zero bias correcting method of accelerometer

An accelerometer and zero offset technology, which is applied in speed/acceleration/shock measurement, testing/calibration of speed/acceleration/shock measurement equipment, and measurement devices, to ensure measurement accuracy and solve the problem of zero offset change Effect

Active Publication Date: 2019-03-12
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of accelerometer zero offset correction method, to overcome the defect of prior art means in solving the accelerometer zero offset problem

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The basic principle of the horizontal inclination measurement based on the accelerometer is: the accelerometer measures the component of the acceleration of gravity on its sensitive axis to solve the horizontal inclination of the accelerometer sensitive axis, thereby realizing the measurement of the levelness. The spatial attitude of the carrier can be measured by installing two mutually orthogonal accelerometers. The measurement principle of the uniaxial accelerometer is as follows: figure 1 shown.

[0020] figure 1 In , the sensitive direction of the accelerometer coincides with the X-axis, and when the accelerometer rotates at an inclination angle θ in the plane where the X-axis and the direction of the gravity acceleration vector are located, it is based on the principle of trigonometric functions. The acceleration component of ...

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Abstract

The invention belongs to the technical field of pitch measuring of an accelerometer, and particularly relates to a zero bias correcting method of the accelerometer. According to the method, in the two-axis horizontal pitch measuring, the pitch of the Y axis is the placing angle of the X axis, and the placing angle of the Y axis is the pitch of the X axis; the method comprises the steps that the actual data at every 1-degree interval of the zero bias from 0-90 degrees of the accelerometer is measured in advanced on a precise erected rotary platform to establish a reference data table, and the table is coded in a main control system and used for online correcting; in the actual use; the placing angle of an X-direction accelerometer is measured by a Y-direction accelerometer, and the actual measuring value of the zero bias of the X-direction accelerometer under the state of the placing angle is obtained by checking the table to perform correcting; the placing angle of the Y-direction accelerometer is measured by the X-direction accelerometer, and the actual measuring value of the zero bias of the Y-direction accelerometer under the state of the placing angle is obtained by checking the table to perform correcting. The method has the advantages that the online correcting of the zero bias of the accelerometer can be achieved to improve the pitch measuring accuracy of the accelerometer.

Description

technical field [0001] The invention belongs to the technical field of inclination measurement based on accelerometers, and in particular relates to an accelerometer zero offset correction method, which realizes online correction of the accelerometer zero offset and improves the inclination measurement accuracy thereof. Background technique [0002] There is no published patent on the correction method of the zero offset of the accelerometer. According to the search, at present, there are many methods for measuring the horizontal inclination angle through two orthogonally installed accelerometers sensitive to the gravitational acceleration. There are many articles and patents for research and explanation. This method is simple and practical, but the measurement error is relatively large. This is caused by the horizontal zero error caused by the zero offset of the accelerometer itself. Therefore, for the inclination measurement system based on the accelerometer, a key techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/00
CPCG01P21/00
Inventor 王锴磊沙春哲刘莎姜云翔
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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