How does the magnetometer technology used by the HIKOB WISECOW sensor family work?

How does the magnetometer technology used by the HIKOB WISECOW sensor family work?

A magnetometer is used to measure the intensity of the earth’s magnetic field. It analyzes the variation of the terrestrial magnetic field induced by the vehicle passage to calculate information such as: Speed, length, silhouettes, magnetic vehicle signatures, time of presence, occupancy rate…

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