High precision Fiber Optic Gyroscope (HFOG) is widely used in aviation, navigation and aerospace. Its development is of great strategic significance to a country’s industrial and nation defense science and technology. Compared with laser gyro, fiber optic gyro has obvious accuracy potential advantages. Under laboratory conditions, the accuracy level of fiber optic gyro has reached the reference level, but the performance of laser gyro is better in scale factor, which seriously affects the application of fiber optic gyro in long endurance inertial navigation. This paper analyzes the factors affecting the scale factor performance of fiber optic gyroscope and points out that the use of wide-spectrum light source will cause the nonlinear error of Y waveguide. In addition, the existing Y waveguide has nonlinear response when modulating the electrical signal and will introduce large error when resetting the modulation step signal. These errors will lead to the further improvement of the scale performance of fiber optic gyroscope. The causes of the nonlinear reset error of Y waveguide are deeply studied, the mechanism of the influence on the scale of fiber optic gyroscope is further analyzed, and finally the solution is given. The experimental comparison shows that the appropriate compensation method can eliminate this influence and improve the performance of gyro scale factor.
High Precision Fiber Optic Gyroscope (HPFOG) is widely used in aviation, navigation, aerospace and other fields. Its development is of great strategic significance to a country's industry, national defense, science and technology. High precision fiber optic gyroscope usually uses a wide spectrum ASE light source to suppress the non heterotropic noise caused by Kerr effect. The gyro accuracy has been greatly improved. It has been reported that high-precision gyroscope reaches the reference level (ppm °/h). Compared with the laser gyro, the scale performance of the fiber optic gyro is still far from that of the laser gyro. The high-precision long endurance inertial navigation system has high requirements on the scale factor performance of the gyro. The scale error of the fiber optic gyro severely limits its application in the high-precision long endurance inertial navigation. The average wavelength of the light source is the main factor affecting the scale stability of the fiber optic gyroscope. This paper studies a double pass broadband ASE light source with real-time wavelength adjustment. By adding reflective light reflectivity control devices on the basis of the traditional reflective double pass broadband light source, the real-time accurate adjustment of the light source wavelength is realized, and then the scale factor of the high-precision fiber optic gyroscope is compensated and controlled to effectively improve the stability of the scale factor.
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