Research on the noise control technology in FOG based on NLMS algorithm

Inertial navigation system requires high precision fiber-optic gyroscope (FOG) to have high anti-noise capability; especially the angle random walk (ARW) has an effect on the alignment precision .In order to reduce ARW , the generation cause of ARW is analyzed, and the noise control method is put forward, which employs forward linear prediction (FLP) filter based on NLMS. The method has a faster convergence speed and better dynamic tracking performance than the standard LMS method. The filtering results are analyzed and compared, and the performance of FOG is improved obviously using this method. The method is simple and easy to implement, and can improve the SNR and alignment precision effectively.