SQUID is one of the most sensitive magnetic sensors,which can be applied in various fields such as geophysics,mineral resources exploration,scientific research and military applications.In this paper,a first-order SQUID planar gradiome-ter was used to construct the full-tensor gradiometer and an unbalance compensation algorithm was used to compensate the full-tensor gradiometer.A full tensor model for simulation was built based SQUID measuring principle.The results show that the algo-rithm can effectively reduce the noise introduced by the unbalance degree in different test environments.The full tensor gradiome-ter can provide the stable output of 9 channels of data,including 6 first-order SQUID planar gradiometers and 3 SQUID magne-tometers.The magnetic gradient data is superior to the earth's environmental magnetic field,and the system is beneficial for mag-netic gradient measurement applications.
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