基于游标法的高精度测频系统设计  

Design of High Precision Frequency Measurement System Base on the Vernier Method

作　　者：张志文[1] 王晴[1] 

机构地区：[1]西安工业大学电子信息工程学院信控技术研究所,西安710032

出　　处：《科学技术与工程》2012年第31期8229-8234,8264,共7页Science Technology and Engineering

摘　　要：为了有效地改善传统测频方法精度低、误差大的问题,提出了一种基于多周期分频段测量法与双游标法相结合的高精度测频方案。可对0.1 Hz—5 MHz范围内的频率信号进行测量。系统通过在Quartus II中用VHDL语言编写脉冲计数及控制模块,并在FPGA芯片内植入NIOS II软核处理器作为系统的控制核心,完成对惯导组件输出的频率信号进行测量。并将测量结果传至上位机进行处理和显示。实验结果表明,系统具有较高的测量精度。同时由于采用软核处理器,大大降低了成本,具有很好的实用价值。In order to effectively improve the problem of the traditional measuring frequency low accuracy and big error, a kind of high precision frequency measurement method based on multi-period frequency division and double vernier measurement is proposed. It sing VHDL language writes pulse count and can measure in the range of 0. 1 Hz -5 MHz frequency. The system u- control module in Quartus II meanwhile NIOS II processor is embedded FPGA chip as a system of soft control core. It can measure the frequency of the inertial component outputs, at last it sends the measured results to the PC which manipulate measured results and display. Experiment results show that the system has higher measurement precision, At the same time using soft-core processor, it greatly reduces the cost and has the very good practical value.

关 键 词：频率测量 FPGA NIOSⅡ软核处理器 VHDL 双游标法 多周期分频段 精度 

分 类 号：TM935.1[电气工程—电力电子与电力传动]