Research on Features Extraction of Magnetic Field Sensor Based on Kalman Filter

In this paper,a method for wire rope non-destruction testing is proposed based on metal magnetic memory technology.The identification of metal magnetic memory signal depends on Signal Noise Ratio (SNR), but the sensor and signal processing determine the SNR.The unstabitily of environment and amplifier saturation can decrease the SNR, By signal processing, the necessity of realtime filtering for SNR is demonstrated.This paper utilizes Kalman filter to analysis the signal.The principle of Kalman filter is introduced The results shows us that the SNR and reliability of system is greatly improved with this method.