For my research I need to detect precise (1 cm accurate) movements of the device equipped with external accelerometer gyro magnetometer and GPS. I found some publications showing possible approaches but none of them have met my requirements. Unfortunately I am working in a magnetic field disturbed by metal objects so I cannot rely on magnetometer readings. Any recommendations?

P.S. I need to draw a 1mx1m square around some GPS tagged location - my device is reading some data related with particular position within that 1mx1m area.

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