Noise Suppression Solution for Ultra-High Precision Fiber Optic Gyroscope

Ultra-High Precision Fiber Optic Gyroscope (UHPFOG), as a high precision angular rate sensor, can be used in space position, strategic missile guidance and submarine navigation. Large ships and submarines are becoming the main application direction of UHPFOG. UHPFOG surpasses ring laser gyroscope in noise and longterm bias stability. Compared with the electrostatic inertial navigation system (ESINS) which has a large number of complex mechanical and electrical components and platform structure, the ultra-high precision FOG inertial navigation system has been greatly improved due to its simple structure, low cost of generation and maintenance, and high reliability. The practical application shows that the noise (random walk) of UHPFOG has become a key factor limiting its application in higher precision fields. Especially in temperature control and rotary modulation systems, random walk directly affects the fluctuation amplitude of latitude of high precision inertial navigation system. With a Semiconductor Optical Amplifier (SOA) decreasing Relative Intensity Noise (RIN) method, random walk coefficient of our FOG is reduced to 40%.