Active magnetic compensation control system and method based on magnetic field multi-source disturbance suppression

By using the TD-Smith advance estimater and the enhanced model-assisted expansion state observer in the active magnetic compensation control system, the impact of multi-source magnetic field disturbance on cardiocerebral magneto-magnetic measurement is solved, effective suppression of multi-source disturbances is achieved, and measurement accuracy and system stability are improved.

CN119644860AActive Publication Date: 2025-03-18BEIHANG UNIV
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Patent Information

Application Number
CN202411801136.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-18
Estimated Expiration
2044-12-09

AI Technical Summary

Technical Problem

When facing multi-source magnetic field disturbances, existing active magnetic compensation control systems are difficult to effectively suppress time delays, external magnetic field disturbances, industrial frequency interference, 1/f noise and model mismatch, affecting the accuracy of cardiocerebral magnetism measurement.

Method used

The active magnetic compensation control system based on the TD-Smith advance estimator and the enhanced model assisted expansion state observer (AMESO) is adopted to advance the magnetic field sensor output signal through the TD-Smith advance estimator, and the external magnetic field disturbance is estimated using AMESO, combined with the filter equivalent tuning method to suppress multi-source disturbance.

Benefits of technology

It effectively suppresses the disturbance of multi-source magnetic field in the magnetic shielding device, improves the accuracy of cardio-brain magnetism measurement, provides an extremely weak magnetic field environment for cardio-brain magnetism measurement, and enhances the stability and robustness of the system.

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Abstract

The invention belongs to the technical field of active magnetic field compensation systems, and discloses an active magnetic compensation control system and method based on magnetic field multi-source disturbance suppression, and the system comprises an ADC collection unit, a DAC output unit, a controller, a high-precision current source, a magnetic compensation coil, a magnetic field sensor, and a TD-Smith advanced predictor. And enhancing a model-assisted extended state observer (AMESO) and a filter equivalent setting method. By adopting the technical scheme of the invention, the real-time estimation accuracy of external magnetic field disturbance can be obviously improved, the influence of magnetic field multi-source disturbance on the internal magnetic field of the magnetic shielding device is inhibited, the uniformity and stability of the internal magnetic field of the magnetic shielding device are improved, and the method is suitable for realizing high-precision control of the extremely low-intensity magnetic field.
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