Error correction method of fluxgate sensor for cable positioning

Abstract

The invention discloses an error correction method of a fluxgate sensor for cable positioning. The error correction method comprises the following steps of modeling a sensor error, simplifying a model, and changing the attitude of the fluxgate sensor to acquire magnetic field data, averaging the measurement data to obtain a total magnetic field reference value, solving an optimal parameter of an error model by combining the acquired magnetic field data and the total magnetic field reference value and using a multivariate function extremum solving method to obtain an error correction model of acertain sensor, and when the cable is positioned, inversing a real magnetic field value by combining the magnetic field value obtained by the sensor and the error correction model. According to the method, other sensors with higher precision do not need to give reference values, the error correction model and parameters of the same sensor do not need to be changed, and the universality of the model is good. The sensor error model obtained in an area without interference is used for data processing during cable detection, the error of the fluxgate sensor for cable positioning is reduced, and the measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of cable positioning fluxgate sensors, in particular to an error correction method for fluxgate sensors. Background technique [0002] With the rapid development of the national economy, the urban underground power grid is becoming more and more complex, and the location of some underground cables cannot be determined. In order to locate and find the cable, many methods have been proposed, among which, using a fluxgate sensor to detect the magnetic field and analyze it, and then locate the cable is a new method. The method has the advantages of flexible operation, strong anti-interference ability and good discrimination ability. [0003] The method of using a fluxgate sensor to detect and analyze the magnetic field is sensitive to changes in the magnetic field, and the core of this method is the fluxgate sensor. Since the cable magnetic field itself is relatively weak, if the accuracy of the fluxgate senso...

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Problems solved by technology

[0006] Aiming at the problem that the error correction algorithm of the traditional fluxgate sensor is too complex and difficult to obtain parameters, so that it cannot be applied to cable positioning, the purpose of the invention is to provide a simpler and easier method that can be applied to locate underground cables based on weak magnetic detection. The fluxgate sensor data correction method has the advantages of easy parameter determination, low use requirements, and no need for other device assistance

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