摘要
在高精度测量中,为了提高光栅细分精度,采用了一种基于FPGA的光栅信号细分及辨向方法。首先用Matlab分析读数头输出的两路原始信号和经过滤波且滤除直流分量的信号特点,并根据处理后的波形构造细分算法,既验证细分算法实现1024细分的可行性,也验证硬件电路实现细分算法的可行性。然后在Matlab对光栅信号的算法分析基础上,设计了一种基于幅值采样细分方法的电路,实现对光栅信号进行细分和辨向。细分硬件电路主要包括8细分电路和精细分电路,8细分电路主要对每个信号的一个周期进行8细分,精细分电路主要是对每1/8周期的信号进行细分。测试结果表明,该细分电路实现了光栅的1024细分,达到了高倍细分目的。
A grating signal segmentation and the direction based on FPGA are adopted in the high precision mea-surement,in order to improve the accuracy of the grating segmentation. Firstly,Matlab is used for analysis two origi-nal signals and filtered and the filtered DC component of the signal characteristics output from the read head.Thefeasibility of 1024 subdivision algorithm implementation and hardware circuit are verified,according to structuresubdivision algorithm,the grating signal is subdivided and identified direction. Tessellation hardware circuit is di-vided into 8 sub-division circuit.Which is 8 segmentation in each cycle of one main signal.Mainly,the accurate cir-cuit handles the eight cycle of each signal segment.The results of the test show that the subdivision circuit achievethe 1024 subdivision of the grating,and the high-powered subdivision purpose.
出处
《传感技术学报》
CAS
CSCD
北大核心
2016年第6期846-853,共8页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金天文联合项目(10978103)
关键词
FPGA
光栅信号
测量
细分
辨向
FPGA
grating signal
measurement
subdivision
identify the direction
