To detect weak magnetic signal under geomagnetic field

geomagnetic sensor that have characteristics of high sensitivity and wide operating range should be used

amorphous wire that has characteristic of high impedance variation rate in high frequency alternating current excitation is suitably used as magnetic sensor. But region of amorphous wire is too short to completely cover range of geomagnetic field

digital compensation technology can be used to compensate most of geomagnetic field

the sensor can work in the linear region of the amorphous wire

sensitivity of the sensor can be improved and working range can be extended. Through the test

the sensitivity of the sensor that using the digital compensation technology is 71. 33 μV / n T

the working range is- 61 750. 8 n T

7

3 774. 8 n T and the maximum error of the detected magnetic field is 2. 45 n T.