Zynq上实现地铁杂散电流的多分辨率采集系统

Design of Multi-resolution Acquisition System for Subway Stray Current Based on Zynq

由于地铁杂散电流信号的微弱性、间断性等特征的存在,使其治理一直是个难题。分析和研究杂散电流信号的各种特征,需要采集大量的杂散电流数据,而在常规的杂散电流信号采集系统中,存在采样率低、传输速率慢、功能单一等现象。为了实现在低分辨率下有效地监测杂散电流信号,而在高分辨率下对杂散电流信号的特征进行分析,基于Zynq中现场可编程门阵列(field programmable gate array,FPGA)部分设计了一套片上地铁杂散电流信号的多分辨率采集系统。利用FPGA部分的模数转换硬核进行前端信号采集,并设计多通道数据分流知识产权(intellectual property,IP)核、单通道数据流协议转换IP核分别实现多路信号的标定与数据协议转换功能,最后通过数据广播IP核和抽取滤波器组IP核实现多分辨率信号采集。实现结果表明,在Zynq上实现的地铁杂散电流信号采集系统,能实现信号的多分辨率采集及监测;且同时能解决数据的高速传输问题。

The subway stray current has always been a problem due to the weak and intermittent characteristics.Analyzing and studying various characteristics of stray current signals requires a large number of stray current data. However, there is a phenomenon in the conventional stray current signal acquisition system, which features low sampling rate, slow transmission rate and simple function. This paper proposes that using FPGA part of Zynq can develop a set of multi-resolution acquisition system, which can monitor the stray current signal at low resolution and analyze the characteristics of the signal at high resolution. The front-end acquisition was carried out by XADC IP. Then, by using Multi-channels Pre Process IP and Single-channel Pre Process IP, this paper completed the function of multi-channel signals calibration and data protocol conversion. Finally, by employing a group decimation IP, it sorted out the multi-resolution acquisition. The research results show that the multi-resolution acquisition system on Zynq not only provides a data source for further analysis about the characteristics of stray current signal, but also can effectively monitor the signal in real time. At the same time, Zynq is helpful to solve the high-speed real-time data transmission and storage problems.