基于FPGA+DSP的浅地表频域电磁探测数字处理系统

Digital Processing System for Shallow Surface Frequency-domain Electromagnetic Detection Based on FPGA+DSP

针对浅地表频域电磁探测对接收信号采集、传输和现场高效处理的要求,提出基于FPGA+DSP的浅地表频域电磁探测数字处理系统.在FPGA中实现数据采集、控制和传输FIFO(First Input First Output)模块,采用新式通用并行端口UPP(Universal Parallel Port)实现大数据传输,基于TMS320C6748平台,采用正交锁定放大方法,设计高效率数据处理算法,利用上位机软件通过RJ45网口对系统进行控制并显示结果.实测结果表明:该架构数字处理系统,对不同金属有着较强探测能力,加快了数据传输速率,缩短了系统工作时间,提高了工作效率.

To meet the requirements of acquisition, transport and spot efficient processing of the received signal in shallow surface frequency-domain electromagnetic detection, a digital processing system for shallow surface frequency-domain electromagnetic detection based on FPGA＋DSP was proposed. Data acquisition, control, and transmission FIFO module were compiled in FPGA. New universal parallel port UPP was used to achieve high data transfer. Efficient data processing algorithm was written with orthogo- hal lock-in amplification method based on TMS320C6748. The system was controlled and the results were displayed with PC software through the RJ45 network port. Test results have shown that the digital processing system of the proposed architecture for different metals has a strong ability of discovery. Data transmission rate is accelerated, system working time is shortened and work efficiency is improved.