CAJ | 학술논문

高精度的角度采集和测量是激光跟踪仪实现跟踪和精密测量的关键。针对激光跟踪仪中采用的圆光栅编码器，本文介绍了一种基于FPGA的数据采集系统的设计与实现方法。该采集系统分为滤波、计数、通信三大模块。数字滤波模块用于消除跟踪控制过程中跟踪头振动、抖动产生的信号干扰；计数模块实现方波脉冲的倍频、辨向及计数；通信模块实现跨时钟域的数据传输。系统通过Modelsim仿真及实验测试验证了方法的可行性与可靠性。采用谐波分析方法对角度误差进行了修正，测量误差由3.5义降低到1.5义。本文设计的角度采集系统及谐波分析误差修正方法具有一定的通用性，可广泛应用于相关领域。
고정도적각도채집화측량시격광근종의실현근종화정밀측량적관건。침대격광근종의중채용적원광책편마기，본문개소료일충기우FPGA적수거채집계통적설계여실현방법。해채집계통분위려파、계수、통신삼대모괴。수자려파모괴용우소제근종공제과정중근종두진동、두동산생적신호간우；계수모괴실현방파맥충적배빈、변향급계수；통신모괴실현과시종역적수거전수。계통통과Modelsim방진급실험측시험증료방법적가행성여가고성。채용해파분석방법대각도오차진행료수정，측량오차유3.5의강저도1.5의。본문설계적각도채집계통급해파분석오차수정방법구유일정적통용성，가엄범응용우상관영역。
The high-precision angle data acquisition is the basic premise to achieve precise tracking control and measurement for laser trackers.In this paper, adata acquisition system based on FPGA is introduced for the actual-applied circular grating encoder.The system is di- vided into three parts and presented in detail.The digital filtering module can filter high-frequency noise, the counting module is used to accom- plish pulse counting and rotating direction discerning, and the communication module implements signals transmitting between multiple proces- sors.The simulation by Modelsim and experimental results show that the system is able to realize correct and reliable data acquisition and trans- mission.The measurement error is analyzed and the harmonic error compensation method is discussed.After compensation, the error is remark- ably reduced from 3.5"to 1.5".