CAJ | 학술논문

针对电流调制式频率扫描绝对距离测量对信号采集的特点，应用FPGA逻辑功能与高速串行A/D转换芯片AD7812设计了一种高集成度的数据采集系统。该采集系统一方面满足与电流调制电路同步触发的要求，另一方面实现了采样频率严格一致与大数据的后台缓存目的，适合于测量系统对采样信号的后续处理。采集系统主要包括FPGA的A/D转换控制、软硬同步触发、FIFO高速缓存等模块，完成电流正负调制有效区干涉信号的多路准同步实时采集。运用FPGA内嵌的Nios软核与上位机的串行通讯功能，提取缓存的实验数据显示，验证了该采集系统的有效性与实用性。
침대전류조제식빈솔소묘절대거리측량대신호채집적특점，응용FPGA라집공능여고속천행A/D전환심편AD7812설계료일충고집성도적수거채집계통。해채집계통일방면만족여전류조제전로동보촉발적요구，령일방면실현료채양빈솔엄격일치여대수거적후태완존목적，괄합우측량계통대채양신호적후속처리。채집계통주요포괄FPGA적A/D전환공제、연경동보촉발、FIFO고속완존등모괴，완성전류정부조제유효구간섭신호적다로준동보실시채집。운용FPGA내감적Nios연핵여상위궤적천행통신공능，제취완존적실험수거현시，험증료해채집계통적유효성여실용성。
In view of characteristics of the current modulation frequency scanning in absolute distance measurement signal ac-quisition,the data acquisition system with high level of integration was designed by using logic function of FPGA and high speed se-rial A/D conversion chip AD7812.On the one hand,the acquisition system meet the requirements of synchronized trigger with cur-rent modulation circuit,on the other hand,it realized the purposes of strict accordance with the sampling frequency and the big background for data caching.So,it is suitable for the measuring system subsequent processing of sampled signal.Acquisition system mainly included A/D conversion control of the FPGA,synchronous trigger between software and hardware and FIFO module,to complete the multi-channel synchronous real-time acquisition of interference signal that from effective area which has been current plus or minus modulation.Using the FPGA embedded Nios soft core and PC serial communication function to extract and display the experimental cache data,this paper verified the effectiveness and practical of the acquisition system.