基于LPC2148的动态信号采集系统设计  

Design of Dynamic Signal Acquisition System Based on LPC2148

作　　者：杨泽林[1] 何莉[1] YANG Ze-lin He Li(College of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, Chin)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2017年第1期113-117,164,共6页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市教委科学技术研究项目(kj130833)

摘　　要：为了适应动态信号处理算法,保证信号采样质量,提出了动态信号采集系统的多采样方式、连续无丢失高速数据传输和抗干扰能力关键性能指标,并利用ARM7 LPC2148 MCU和AD7606 ADC设计了动态信号采集系统。采取电源及USB接口隔离措施抑制系统内(外)部干扰,保证模拟信号的质量;构建采样函数程序库,通过赋值ARM MCU的中断服务程序入口地址寄存器实现多采样方式,给出了关键程序代码;设计了双指针环形缓冲区模型,实现高速连续的数据传输,降低了对MCU性能和内存容量的要求;给出了以此模型为基础的系统软件架构、功能组成原理及程序流程。重型卡车变速箱一轴内锥孔锥度现场在线测量结果表明:50 kHz双通道采样时,环形缓冲区长度为8 K,可连续采集和传输32K点数据而不丢失数据且无误码,采集系统模拟部分电源纹波小于5 mV,锥度测量误差小于3″。In order to adapt to the dynamic signal processing algorithm and ensure the signal acquisition quality,the key performance of the dynamic signal acquisition system is proposed which is a multi sampling method,continuous and no loss high speed data transmission and Anti-interference capability.The acquisition system is designed by using LPC2148 MCU AD7606 and ADC ARM7.To ensure the quality of analog signals,the power and USB interface isolation measures are taken to inhibit the system internal（external） interference.To implement multi sampling method by assigning MCU ARM interrupt service program,the sampling function library is constructed and the key program segment is given.In order to achieve high speed and continuous data transmission and to reduce the requirements of MCU performance and memory capacity,the dual pointer ring buffer modelis designed.The system software architecture,program composition and function principle flow chart are all given in the research.In the process of the application of the inner cone angle measurement,it shows that：the analog power ripple is less than 5mv;under dual-channel acquiring 32 K points at 50 kHz sampling rate,the data is without losing and Bit-error when the size of ring buffer is 8K word.Taper error is less than 3″.

关 键 词：动态信号采集系统 采样方式 双指针环形缓冲区 信号干扰 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]