In order to achieve low power consumption

high precision and large capacity storage technology of fluxgate sensor. On the basis of optimization scheme

circuit system of collecting data

recording time

storing data and fitting and correction is designed

focusing on composition of circuit system and data correction methods is studied and improved. The prototype is tested in actual geomagnetic environment

the results show that power consumption of the whole set of device is reduced to level of milliwatts

moreover

the deviation of Earth ’s magnetic field measurements and accurate value is less than 20 n T

and the storage capacity up to 2 GB

the expected goal is reached.