Quartz resonance differential accelerometer temperature compensation method

A technology of temperature compensation and accelerometer, which is applied in the direction of measuring acceleration, speed/acceleration/shock measurement, speed/acceleration/shock measurement equipment testing/calibration, etc. It can solve the problems of long cycle time and high hardware compensation cost

Active Publication Date: 2020-03-13
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

From the perspective of engineering application, the cost of hardware compensation is relatively high and the cycle is long; therefore, software compensation is usually performed by establishing an accurate temperature compensation model

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  • Quartz resonance differential accelerometer temperature compensation method
  • Quartz resonance differential accelerometer temperature compensation method
  • Quartz resonance differential accelerometer temperature compensation method

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Embodiment Construction

[0028] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] refer to figure 1 , a quartz resonance differential accelerometer temperature compensation method, comprising the following steps:

[0030] Step 1: Collect the quartz resonant differential accelerometer and apply acceleration a (accelerometer measurement range) at different temperatures (operating temperature range), such as [-40°C, -30°C,...,80°C], such as [- 1g,-0.7g,…,1g], the frequency signal f output by the accelerometer 1 , f 2 , the temperature sensor output signal T; according to the data set at the same temperature T [f 1 , f 2 , a], using the least squares method to calculate the static mathematical model f of the accelerometer at this temperature 1 -f 2 =K 0 +K 1 *a+K 2 *a 2 Zero bias K 0 , Scale factor K 1 and the second-order nonlinear coefficient K 2 ;Finally obtain the data sources at different temperatures [f ...

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Abstract

A quartz resonance differential accelerometer temperature compensation method comprises the following steps: frequency signals f1 and f2, a temperature signal T and an acceleration a output by an accelerometer and a temperature sensor are collected; zero offset K0, a scale factor K1 and a second-order nonlinear coefficient K2 of a static mathematical model of the accelerometer at different temperatures are calculated, and f1, f2, T, a, K0, K1 and K2 form a data source; data sources under different temperature and acceleration conditions are selected as initial sample data, and the sample datais preprocessed and divided into a training sample and a verification sample; related parameters of a self-increment extreme learning machine are set; model learning and verification are carried out by taking the sample data as the input of a temperature compensation model of the auto-increment extreme learning machine; and the preprocessed measured frequency signals f1 and f2 and temperature signal T are input for model prediction. The method not only has the advantages of high compensation speed and self-determination of the number of hidden nodes, but also has an accelerometer calibration function.

Description

technical field [0001] The invention belongs to the technical field of quartz acceleration sensors, and in particular relates to a temperature compensation method for a quartz resonance differential accelerometer. Background technique [0002] The accelerometer is one of the key components of the inertial navigation system. It is widely used in aerospace, automobile, consumer electronics and other fields. Its performance directly determines the level of navigation accuracy. Quartz resonant differential accelerometer is a kind of micro-mechanical accelerometer processed by MEMS technology, which outputs digital frequency signal. It mainly consists of two identical double-ended fixed quartz tuning forks, a sensitive mass, a mounting base and a damper. When the accelerometer is subjected to acceleration in the sensitive direction, the sensitive mass will be subjected to an axial inertial force of the size F=ma, one of the tuning forks is subjected to tension, and its resonant ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/097G01P21/00
CPCG01P15/097G01P21/00
Inventor 周冠武张庆红李皎康磊
Owner XI'AN PETROLEUM UNIVERSITY
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