Laser gyro usually use the DAC and analog multiplier to generate sine self-excited oscillation control mode.At present,there is no localize design for the multiplier,and the self-excited oscillation occasionally fails under the condition of high or low temperature.Therefore,the localize MCU and DAC devices are selected to replace the analog multiplier module,the control phase is quickly captured by the dithered zero-crossing signal,PI controller is used for phase-frequency difference calculation,and cycle driver signal(sine signal or triangular wave signal)is output by lock-up table,so as to realized dither closed-loop control.The proposed scheme has been applied in a miniaturize assembly IMU with three 50-type laser gyro.The localize design of key components is realized,and the standard variance of 100 s count mean of fixed position gyro system is better than 5‰.
dithered controlphase-locked loopdirect digital synthesislocalize design
万方数据
维普
