Landslide monitoring is an effective technical means for landslide prevention and control.Aiming at the failure problems of borehole inclinometer when large displacement occurs in the deep part of the landslide,a landslide monitoring method based on magnetic gradient tensor is proposed.This method is based on the magnetic gradient tensor theory.The cross array is used for monitoring.The gradient value of the axis is obtained from the three components of the measured magnetic flux density.Then the spatial coordinates of the target magnetic source are calculated according to the inversion.The feasibility of this method is verified by experiments.Before the measurement,the magnetic sensor array is fixed and the deviation angle is calculated.After that,the permanent magnet is moved slowly according to the rectangular trajectory.The precision of this method is verified by selecting certain measurement points.The average absolute error of the three axes is within 0.1m,and the maximum error of the three axes is within0.2m.Finally,the reason for the error of this method is analyzed.
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