Improving Information Collection Environment of Magnetocardiography Device Through Adaptive Interference Suppression Strategy

Multiple frequencies high-amplitude magnetic inter ference in the environment can adversely a ect the detection of cardiac magnetic field signals inside magnetocardiography device. Adaptive multi-resonance control (AMR) is suitable for suppress ing such interference, but the stability of active magnetic field compensation system (AMC) will be destroyed by the influence of the time delay of the sensor. To address this problem, this paper proposes a interference suppression method that combines an improved adaptive multi-resonance controller (IAMR) with proportional di erential (PD) and linear extended state observer (LESO). Experimental results show that PD-LESO-IAMR can e ectively suppress multiple frequencies magnetic interference under the premise of ensuring system stability. Compared with conventional PD-LESO, the average magnetic field interference in the MSC can be reduced from 3.73 pT to 1.80 pT, and the maximum anti-interference ability was increased by 50.25%.