Planar two-degree-of-freedom displacement measurement method based on magnetic field information

The present invention discloses a planar two-degree-of-freedom displacement measurement method based on magnetic field information. The method employs aperiodic magnetic field information to achieve displacement measurement, a permanent magnet and a magnetic sensor array are respectively fixed on relatively moving objects, the permanent magnet generates magnetic field information, and the magneticsensor array arranged according to a certain rule is configured to detect the magnetic field information. The Legendre orthogonal polynomial structure is employed to establish a magnetic sensor measurement model, a solution method of simultaneous online solution of the measurement model parameter and displacement is provided to ensure the measurement model accuracy at each measurement point and achieve precise displacement measurement. The planar two-degree-of-freedom displacement measurement method based on magnetic field information can solve the problem that the measurement model is not high in accuracy to cause l