Electronic System Design of Near Sea-bed Tricomponent Magnetometer

Implement principle of three-component magnetoresistive magnetometer was described.Electronic system of near sea-bed three-component magnetometer based on magnetoresistive sensor,inertial measurement unit,ARM7 microprocessor was designed.Sensor choosing tips were given.The whole hardware scheme included signal conditioning circuit,high-definition data acquiring circuit,large-amount data storage and the software scheme based on theμC/OS-Ⅱ real-time operating system and embedded filesystem library(EFSL).Compared with traditional magnetometer,this system has advantages such as small size,low power consumption and good anti-interference ability.And it can be applied in near sea-bed geomagnetism measurement.