基于SOPC的便携式高精度频率仪设计  

Portable High-precision Frequency Meter Design Based on SOPC

作　　者：张天恒[1] 叶伟[1] 王阳阳[1] 张兴红[1] 陈鸿雁[1] 

机构地区：[1]重庆理工大学机械检测技术与装备教育部工程研究中心时栅传感及先进检测技术重庆市重点实验室,重庆400054

出　　处：《仪表技术与传感器》2015年第5期34-37,共4页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(51275551);重庆市自然科学基金项目(cst2012jja40062)

摘　　要：随着频率测量系统在许多领域的广泛应用,为了达到高速高精度宽量程的频率测量,介绍了基于Nios II处理器软核的SOPC为控制核心,采用直接数字频率合成(DDS)技术,在SOPC上构建通道切换逻辑控制、信号处理器模块以及人机交互模块,实现高速多通道数据运算与处理,缩小了频率仪体积,并降低了开发成本。通过通道切换逻辑控制,实现宽量程频率采样。通过细分插补软件算法实现0.061 ns级的时间测量,从而实现高精度的频率测量。With the widely application of the frequency measurement system in many areas,in order to achieve high speed and high precision wide-range frequency measurement,the SOPC control core based on Nios II soft core processor was introduced.The direct data frequency synthesis technology was used.The channel switching logic control,signal processor module and human-computer interaction module were built on SOPC.The high speed multi-channel data operation and processing were realized.It reduced the volume and the cost of frequency meter.Wide-range frequency sampling was realized by multi-channel switch logic control. Time measurement can be realized at 0.061 nanoseconds through software interpolation subdivision algorithm,thus high precision of frequency measurement was realized.

关 键 词：直接数字频率合成 NiosⅡ软核处理器 宽量程频率采样 细分插补算法 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]