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With the miniaturization of medical equipment and the comfort of diagnosis mode, positioning has become a major challenge in the research of capsule robots. In order to realize the effective positioning of magnetically controlled capsule robots, a positioning method based on double-layer symmetric sensor array is proposed in this work. Firstly, a near-field error correction method based on multi-magnetic dipole model is presented to improve the accuracy of capsule robot magnetic field model. Then, for multi-magnetic driving environment, an arrangement of double-layer symmetric sensor array is ...