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A Gravity Field Dynamic Calibration Method for Accelerometer

An accelerometer and dynamic calibration technology, applied in the testing/calibration of speed/acceleration/shock measurement equipment, speed/acceleration/shock measurement, instruments, etc., can solve problems such as inappropriateness, improve measurement accuracy, and expand calibration range The effect of increasing the value range and improving the amplitude accuracy

Active Publication Date: 2022-03-25
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

these methods are not suitable for dynamic calibration of small g accelerometers used in space vehicles

Method used

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  • A Gravity Field Dynamic Calibration Method for Accelerometer
  • A Gravity Field Dynamic Calibration Method for Accelerometer
  • A Gravity Field Dynamic Calibration Method for Accelerometer

Examples

Experimental program
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Embodiment 1

[0081] In order to introduce the content of the present invention in detail, some concepts are defined below.

[0082] Definition 1: Gravity field: the gravitational acceleration field generated by the local gravity, its direction is perpendicular to the local horizontal plane downward.

[0083] Definition 2: The accelerometer gravity field dynamic calibration device: the mechanical mechanism is a two-axis horizontal turntable with an inclined axis, and its outer axis is an inclined axis, which can achieve angular position setting from 0° to 90°; the inner axis is a rotation axis, Uniform angular motion can be achieved within the angular rate range of (0.02π ~ 60π) rad / s.

[0084] In Example 1, a quartz flexible pendulum accelerometer is used, the range is 25g, the power supply is ±15V DC power supply during the calibration process, the output terminal is connected to a 50Ω sampling resistor, and the scale factor is K. 1 The nominal value of 60mV / g.

[0085] A method for dyn...

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Abstract

The invention discloses a gravity field dynamic calibration method of an accelerometer, which belongs to the field of dynamic calibration methods of an accelerometer. The realization method of the present invention is as follows: the accelerometer is installed, the input axis of the accelerometer is parallel to the working surface, and the center of mass of the detection mass coincides with the center of the rotation axis. Determines the initial zero angle of the rotary axis. A dynamic acceleration model based on the dynamic calibration device of the accelerometer gravity field is established. Acceleration magnitude points selected for dynamic calibration of the accelerometer gravity field. Reproduce the maximum and minimum values ​​of the acceleration amplitude respectively, and obtain the sensitivity at zero frequency through calibration. Determine the frequency point, carry out dynamic calibration of the gravity field, and obtain the sensitivity ratio and phase difference of the frequency point. Fit the sensitivity ratio and phase difference of all frequency points to obtain the amplitude-frequency characteristic curve and phase-frequency characteristic curve respectively. Correction is performed in the dynamic measurement of the accelerometer according to the fitting curve, thereby improving the measurement accuracy of the dynamic acceleration.

Description

technical field [0001] The invention relates to a dynamic calibration method of a gravity field of an accelerometer, and belongs to the field of dynamic calibration methods of an accelerometer. Background technique [0002] An accelerometer is a sensor used to measure the acceleration of an object's line of motion. The dynamic calibration of the gravity field of the accelerometer is based on the maximum 1g generated by the gravity field (g is the acceleration of gravity, 1g=9.8m / s 2 ) under the acceleration excitation, for (10 -4 ~9.8)m / s 2 The micro-g-value accelerometer performs dynamic calibration of amplitude-frequency characteristics, phase-frequency characteristics, etc. Micro-g-value accelerometers are mainly used in inertial navigation systems, flight control systems, health monitoring systems, etc. of space vehicles to measure the linear acceleration of vehicles. [0003] Before the accelerometer is assembled into application objects such as space vehicles, the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P21/00
CPCG01P21/00
Inventor 廖建平肖述晗李晓婷李国文郭建麟何懿才
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA