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A body magnetic correction method for a three-axis magnetic sensor

A calibration method and sensor technology, applied in the field of sensors, can solve the problems of incapability of on-body magnetic calibration, high solution space dimension, and large computational cost, and achieve the effects of improving calibration efficiency, simplifying operation steps, and reducing adjustment parameters.

Active Publication Date: 2021-07-27
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the optimization process, because there are too many transformed parameters, the dimension of the solution space is too high, which makes the solution complex and the calculation cost is too high, and some algorithms need to adjust more parameters, or when correcting, it is easy to appear Local optimal solutions lead to poor correction of bulk magnetism

Method used

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  • A body magnetic correction method for a three-axis magnetic sensor
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  • A body magnetic correction method for a three-axis magnetic sensor

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Embodiment 1

[0061] A body magnetic correction method for a three-axis magnetic sensor, the specific steps are as follows:

[0062] Step 1: Continuously detect with the calibrated magnetic sensor at its working position to obtain k sets of three-component values ​​of the magnetic field and k total magnetic field values. The square of the total magnetic field value is equal to the sum of the squares of the three magnetic field component values ​​of x, y, and z.

[0063] Step 2. Normalize the k total magnetic field values ​​to obtain k normalized magnetic field values ​​H′ i ; and calculate the coefficient of variation σ(H' i ) is H' 1 ,H′ 2 ,...,H′ k standard deviation of .

[0064] Step 3. If the coefficient of variation S<0.5, go to step 4; otherwise, go to step 5.

[0065] Step 4, using the "weak interference model based on the crow search algorithm" to calibrate the magnetic sensor.

[0066] 4-1. Initialize the location and memory of the crow.

[0067] Define flight length fl ...

Embodiment 2

[0106] The difference between this embodiment and Embodiment 1 is that after step 1 is executed, the coefficient of variation is no longer calculated, but directly enters into step 4 to calibrate the magnetic sensor. This embodiment is applied to a magnetic sensor in a deep-sea environment; the magnetic field of the environment where this type of magnetic sensor is located is relatively stable, so it can be assumed that a small coefficient of variation is not required.

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Abstract

The invention discloses a body magnetic correction method of a three-axis magnetic sensor. In the process of magnetic sensor calibration, because there are too many transformed parameters, the dimension of the solution space is too high, which makes the solution complex and the calculation cost is too high. The present invention is as follows: 1. Use the calibrated magnetic sensor to continuously detect at its working position. 2. Calculate the coefficient of variation of the magnetic field; 3. If the coefficient of variation S<0.5, go to step 4; otherwise, go to step 5. 4. Calibrate the magnetic sensor using the "weak interference model based on the crow search algorithm". 5. Calibrate the magnetic sensor under the strong interference model by conventional calibration methods. The present invention divides the calibration of the magnetic sensor into two different situations by introducing the coefficient of variation of the magnetic field; thus, when the coefficient of variation is small, the weak interference model based on the crow search algorithm is used to calibrate the magnetic sensor to improve the efficiency of calibration.

Description

technical field [0001] The invention belongs to the field of sensors, and in particular relates to a method for body magnetic correction according to the regularity of data collected by a three-axis magnetic sensor. Background technique [0002] Magnetic prospecting is an important means of marine mineral resources exploration. Through the analysis of magnetic anomalies in the test area, combined with sensor information such as redox and turbidity, the distribution of resources in the area can be explored. When using the magnetic method to prospect for resources, the accuracy of the resource exploration may be reduced due to the large error of the collected data in the magnetic sensor measurement. [0003] In order to reduce errors, we mostly use some meta-heuristic intelligent algorithms to correct errors, and transform error correction into solving complex high-dimensional numerical function optimization problems. In the optimization process, because there are too many tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38G01V3/40
CPCG01V3/38G01V3/40
Inventor 章雪挺何欢
Owner HANGZHOU DIANZI UNIV