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Direction cosine matrix algorithm (DCM) is common algorithm used in industrial grade MEMS movement sensors. However, due to external mechanical vibration and strong electromagnetic environment, MEMS gyro drift output data is large, by which attitude errors of gyro integral solver appears cumulative growth from time to time. So the combination of DCM algorithm with GPS or gyro magnetic is widely adopted to calculate the angle error correction. However, this kind of monitors within the GPS and magnetic sensors appear disabled, when mounted directly on the surface of high-voltage transmission lines for existing strong power frequency electromagnetic interference environment. In order to real-time output accurate value of wire trajectory, the improved DCM algorithm is proposed that complementary filter algorithm applied to MEMS gyroscopes and accelerometers; and then a detailed galloping track solver process is designed; Finally, the validity of the new galloping monitor is proved on specified galloping experiment platform.