论文部分内容阅读
为了进一步增强硅微机械陀螺仪驱动模态的控制精度与稳定性,提出了一种基于自激振荡原理,以现场可编程门阵列(FPGA)为主要数字信号处理平台的驱动电路。以陀螺仪驱动模态特性为出发点,分析了自激振荡原理对驱动电路的要求。分析并建立了驱动相位控制与驱动幅度控制模型,实现了频率测量-补偿算法控制驱动环路相位,PID控制算法控制环路幅度。实验结果表明,常温下驱动幅度控制精度达到1.5×10-5,并且能跟踪驱动模态谐振频率。由于采用了数字电路使得驱动幅度温度系数由原来模拟电路方案的7.69×10-5/℃降低到1.183×10-5/℃。相比传统模拟电路控制方案,本方案具有驱动精度高,温度适应性好的优点。
In order to further enhance the control precision and stability of the driving mode of the silicon micromechanical gyroscope, a driving circuit based on the self-oscillation principle and field-programmable gate array (FPGA) as the main digital signal processing platform is proposed. Taking the gyro-driven mode characteristics as the starting point, the requirements of the driving circuit are analyzed. The model of drive phase control and drive amplitude control is analyzed and established to realize the frequency measurement - the compensation algorithm controls the drive loop phase and the PID control algorithm controls the loop amplitude. Experimental results show that the control accuracy of driving amplitude reaches 1.5 × 10-5 under normal temperature, and the mode resonance frequency can be tracked. Due to the adoption of digital circuit, the temperature coefficient of driving range is reduced from 7.69 × 10-5 / ℃ to 1.183 × 10-5 / ℃ in the original analog circuit scheme. Compared with the traditional analog circuit control scheme, the program has the advantages of high driving accuracy, good temperature adaptability.