Real-time calibration method for array type MEMS magnetic sensor

A technology of magnetic sensor and calibration method, applied in the field of MEMS magnetic sensor, capable of solving problems such as bias error

Active Publication Date: 2020-01-10
SUZHOU UNIV
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the problem of bias error in the calibration process of the MEMS magnetic sensor with large measurement noise in the traditional method, a real-time calibration method for the array MEMS magnetic sensor is adopted.

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  • Real-time calibration method for array type MEMS magnetic sensor
  • Real-time calibration method for array type MEMS magnetic sensor
  • Real-time calibration method for array type MEMS magnetic sensor

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Embodiment Construction

[0135] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0136] A specific application scenario of the present invention is introduced below:

[0137] In this embodiment, a real-time calibration method for an arrayed MEMS magnetic sensor proposed by the present invention is simulated and verified by Matlab simulation software, thereby proving the accuracy of the calibration result of the arrayed MEMS magnetic sensor. The simulation hardware environment is Intel(R) Core(TM) T9600 CPU 2.80GHz, 4G RAM, Windows 7 operating system. Such as figure 2 Shown is the data acquisition curve of the array MEMS magnetic sensor, and the illustrated results show that the array MEMS magnetic sensor has a uniform result when measuring the magnetic field...

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Abstract

The invention discloses a real-time calibration method for an array type MEMS magnetic sensor. The real-time calibration method for the array MEMS magnetic sensor comprises the following steps of: acquiring real-time data of an array MEMS magnetic sensor and preprocessing the real-time data; performing mean value operatio on the array type MEMS magnetic sensor data; establishing a unified array type MEMS magnetic sensor calibration model; by adopting a parametric model, designing an adaptive Kalman filtering algorithm to achieve parameter estimation, setting the number of sampling points in the calibration process to be M, if k is equal to M, outputting a calibration result, completing the calibration process of the array type MEMS magnetic sensor, and if k is less than M, indicating thatthe calibration process is not completed, repeating the steps until the calibration process is completed, wherein both k and M are positive integers. The method has the beneficial effects that (1) a unified array type MEMS magnetic sensor measurement model is adopted, so that the method can reduce measurement noise, and have the advantages of real-time estimation of unknown parameters and construction of a calibration result by designing a parameter estimation model.

Description

technical field [0001] The invention relates to the field of MEMS magnetic sensors, in particular to an array type MEMS magnetic sensor real-time calibration method. Background technique [0002] MEMS magnetic sensor is a commonly used sensor in MEMS inertial navigation system, which can provide heading information for MEMS inertial navigation system. Due to the interference of hard iron and soft iron, which affects the accuracy of heading measurement, the MEMS magnetic sensor needs to be calibrated before heading determination. [0003] The traditional technology has the following technical problems: [0004] The traditional MEMS magnetic sensor calibration method is an analytical method based on the minimization of the cost function. This method is susceptible to the measurement noise of the MEMS magnetic sensor, which makes the calibration parameters have bias errors, which affects the heading measurement accuracy. Therefore, it is necessary to suppress the measurement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G06F30/20G06F17/18
CPCG01C25/00G06F17/18
Inventor 徐祥朱琳徐大诚白春风
Owner SUZHOU UNIV
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