Design Of Digital Servo System For Flexible Gyroscope

As one of most important components in inertia navigation system, flexiblegyroscopes are widely used in missiles, carrier rockets, aviation, naval vessel, tank,armored car, artillery, and so on. As a measure part of navigation, control and guide,stabilization and gesture control system, the gyro has a function of measuring thecarriers' rate.The paper concentrates on the application study about the digital servo system offlexible gyroscope. The design and test of flexible gyroscope illuminate the limitationof analogical servo system. So it is necessary to design the digital servo system.To satisfy the practicability and concision request of the system, the digitalrebalance loop is selected as the loop of digital servo system for the flexible gyro.Analyzed through the design theory of the digital rebalance loop, the restrainedconditions, which contain Sampling speed, data differentiate, sawtooth slope,quantization error and passive surge et al, must be considered during the design of thedigital rebalance loop. Moreover, the method of how to compensate the crosscoupling of flexible gyroscope is presented. The system used 80C196KC as thecentral control unit, and used FPGA as assistant unit. FPGA scheduling circuitcontrolled the power source of gyro's motor, surging magnetism signal, synchronousdemodulation signal and the produce of sawtooth, which improved the resourcesutilize ratio. The logic circuit of controller participates in the control of system, so thesystem can leave out the A/D sampling circuit,(which is one necessary part inanalogical servo system), and can eliminate the quantization error and improve theprecision of system.This research project is a part of certain military engineering, which hasconsiderable importance in theory and practicality. Test results verify the viability andeffectiveness of the algorithm.