De-noising Method for Fiber Optic Gyroscope Based on VMD-PE-CMSE

To improve the short-term precision of inertial navigation system(INS), the noise of the inertial measurement(IMU) should be de-noised. In order to reduce the noise of the Fiber Optic Gyroscope, variational mode decomposition(VMD) combined with permutation entropy(PE) and Consecutive Mean Square Error(CMSE) is utilized in the de-noise method. The raw signal is decomposed into the intrinsic mode functions(IMFs) by VMD, the noise of IMF can be identified by PE, and the IMF is de-noised by CMSE. The reconstructed signal is composed of de-noised IMFs. The result of the experiments show that VMD combined with PE can identify the noise of the signal, and CMSE can de-noise the signal effectively. The static test show that the de-noising method can improve the short-term precision of INS.