光栅编码器在激光陀螺平台系统中的应用

Application of Grating Angular Encoder in Stabilized Platform System with Ring Laser Gyro

针对激光陀螺平台系统中测角装置高精度、高稳定度与合适动态范围的技术要求,选用RENISHAW新型增量式圆光栅作为测角装置。采用FPGA芯片设计了光栅测角系统的信号处理电路,对光栅信号进行了时序同步、抗干扰数字滤波、倍频与鉴相,设计了计数电路及与上位机的通信接口。分析了误差产生的原因,并利用激光陀螺标定了测角装置的实际测量精度。实验结果表明,设计实现的测角装置测角分辨力为3″,测量精度优于±8″,动态角速率测量范围为0 o/s^360°/s,测量结果准确,性能稳定。

Referring to the angular measurement of stabilized platform system with Ring Laser Gyro （RLG）, high accuracy, high stability and the appropriate dynamic range are important design requirements. RENISHAW grating angular encoder was the better choices, and the cyclone FPGA chip was selected as signal-processing circuit. Angular encoder signal was synchronized, filtered digitally, doubled frequency and discriminated phase before it was counted. Interface circuit was designed to implement communication between FPGA and the Master-Computer. RLG was applied to calibrate the grating angular measurement. The calibration result shows that by using this set of relative angular measurement devices angular resolution of 3″, measurement accuracy of ±8″ and dynamic rate range of 0 °/s -360 °/s are obtained steadily and accurately.