Aresearch Of Digital RLG’s Control System Based On FPGA

The Ring Laser Gyroscope (RLG) is one of the main components for Strap-down Inertial NavigationSystem, which has great market prospects and research value. Comparing with the developed countries, thetechnology of laser gyroscope in our country is far behind. As the demanding of high accuracy Ring LaserGyro is increasing in our country， FPGA is implemented in the control system of the RLG in this paper,and using FPGA as the core of Laser Gyro Digital Control System which takes the place of traditional GyroLight Path Control System and the Jitter Partial Frequency Control System. It solves the key technologyproblem in the digital laser gyro researching. So, it has important significance to improve the Laser Gyroperformance and the production efficiency.This paper introduced the fundamental working principle of the laser gyroscope, discussed the necessityof the light path control and the jitter partial frequency control in the laser gyroscope. Based on the deepunderstanding of laser gyro principle, a digital control program of ring form laser gyroscope is designed. Itcompleted the light-intensity and path-length controlling of ring laser gyro through the way of small jitteron frequency stability method in the FPGA, and designed a Pulse Width Modulation (PWM) Jitter PartialFrequency System based on FPGA, which can achieve jitter drive and random noise injected in laser gyrointernal. It solved the key technology that the laser gyro digitalize must be solved. It is greatly reduced thevolume of the laser gyroscope by using PWM way to realize laser gyro dithering partial frequency control.This paper use FPGA as the core processing chip, the ring laser gyro light-intensity and path-lengthcontrol circuit and jitter partial frequency control circuit are instantiated respectively in FPGA. After finishthe digital circuit design, this paper refers to GJB2427-95standard, by doing experiments to compare withtraditional analog control system, the result of experiments proved the similar results from the two ways, soour way is acceptable. And then we proved the reliable of Digital Light Path Control System Design.