The Digital Design Of RLG's Control System

As the demanding for high accuracy Ring Laser Gyro is increasing in our country, FPGA is implemented in the control system of the RLG. The traditional control system of the RLG is replaced by a newly designed digital control system in which FPGA is used. In order to digitalize all the control system, a four-part phase demodulation circuit has been programmed into FPGA, a MCU (Micro Control Unit) is used to communicate with computer, and all the data is in a digital mode. Through these methods, the key issue of developing RLG has been solved; it is significant for the RLG's producing and ability-improving.In this dissertation, we discuss the theory of the RLG, and how to stabilize the intensity and path length of light. The transfer functions of all parts of the analog control system have been analyzed, and a newly designed digital modal has been totally proved by simulating with DSP Builder tools in Matlab; all through these, the Incremental PID arithmetic has been determined to be used to control the whole system. After analyzing the output data of gyro, a four-part phase demodulation circuit has been designed in FPGA. All the logical design in FPGA is written by Verilog HDL. The control system has been fulfilled and has been applied into RLG system.