The invention relates to a magnetic
gradiometer correction method based on
magnetic gradient invariants. Modeling of scale factor errors, non-orthogonal errors, non-alignment errors, and zero offset errors existing during construction of
tensor instrument is carried out. With help of a scaler constraint method during a magnetic vector instrument correction, two independent rotation invariants of the
magnetic gradient tensor are used for the constraint, and then an optimal correction parameter is acquired. By starting from the integrated errors of the
tensor instrument, the modeling of the errors of the tensor instrument is carried out, and the two independent rotation invariants of the
magnetic gradient tensor are used for constraint, and then the optimal correction parameter is acquired. The errors of the tensor instrument are corrected more intensively, and measured data is more reliable. Compared with conventional tedious and complicated tensor
instrument error correction methods, the magnetic
gradiometer correction method is advantageous in that the result of the measured data is processed directly, and no other data is required, and use is more convenient; and in addition, the magnetic
gradiometer correction method can be used in field environment provided with a geomagnetic field without being limited by various magnetic gradient measurement principles, and also can be used in magnetic shielding environment.