提出了一种基于FPGA的光栅位移传感器信号细分处理技术，采用CORDIC（坐标旋转数字计算机）解算相位，同时结合单准确度浮点运算，将辩向、粗码计数、相位解算、粗码精码浮点运算集成于单片FPGA实现，保证了细分的准确度、细分数据的有效计算准确度及信号处理的速度.设计中采用Altera公司的Cyclone II_EP2C20F484C8型芯片进行验证，对20 μm栅距的光栅尺信号进行细分处理，实验结果证实了该方法的正确性和可行性.

A subdividing method for grating signal based on FPGA was proposed. The method uses CORDIC algorithms and singleprecision floatingpoint calculation, which can implement the function of directionjudgement,counting, phase decoding by CORDIC algorithm, floatingpoint calculation between the two codes on a single FPGA. It can assure the subdivision accuracy, guarantee the effective calculation accuracy of subdivision data, and ensure the computational speed. The simulation was based on chip CycloneIIEP2C20F484C8 of Altera company, by subdividing the signal of grating with 2 μm length period. The result proves the feasibility and validity of this method.