基于FPGA的磁异常数据采集系统设计

Design of magnetic anomaly data acquisition system based on FPGA

针对磁探测领域要求的多通道数据采集同步性、实时性的要求,文中采用现场可编程逻辑门阵列(Field Programmable Gate Array,FPGA),设计了一套同步采集24路地磁异常数据的系统。通过SignalTap抓取关键信号的波形进行分析,表明该数据采集系统同时满足了同步性和实时性的要求。实验结果表明,采集系统的噪声水平低于传感器的灵敏度,并且能准确识别目标。系统采用模块化的设计思想,结构简单、工作可靠,利用FPGA的并行工作特性,可严格保证系统的同步性。同时,系统采用了32位高分辨率的模数转换器(Analog to Digital Converter,ADC),满足了磁异常探测中的精度要求。

In response to the synchronization and real-time requirements of multi-channel data acquisition required in the field of magnetic detection,a Field Programmable Gate Array(FPGA) is used in this article to design a system for synchronously collecting 24 channels of geomagnetic abnormal data. The analysis of the waveforms of key signals captured by SignalTap shows that the data acquisition system meets the requirements of synchronization and real-time. The test results show that the noise level of the acquisition system is lower than the sensitivity of the sensor,and it can accurately identify the target. The system adopts the modular design idea,the structure is simple,the work is reliable,and the parallel working characteristics of FPGA can strictly guarantee the synchronization of the system. At the same time,the system uses a 32-bit high-resolution analog-to-digital converter(Analog to Digital Converter,ADC) to meet the accuracy requirements for magnetic anomaly detection.