Key technology research of long-range analog differential output magnetometer array
In considering the effect of magnetic stealth on ships,this paper first designs and develops a broadband,ana-log differential output fluxgate sensor.Next,a low-noise multichannel acquisition system was developed.Then the influence of the parameters of the transmission cable on the output signal of the sensor was analyzed.Finally,a magnetometry system with eight fluxgate sensors as the basic unit was constructed and experimentally verified under laboratory and field environ-mental conditions.The results showed that the developed magnetic field measurement system had reliable performance and could achieve accurate acquisition of signals below the 1 000 Hz band under 2 000 m cable conditions,and the error value at the 1 000 Hz frequency point was less than 3％.180 hours of continuous measurement data results under 1000 m cable condi-tions showed that the modal deviation of the eight fluxgate sensors was no more than 20 nT.
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