以软件无线电数字中频接收理论为依据，利用FPGA实现了宽频域无线信号监测的系统设计。本课题主要完成数字中频接收，并将处理后的频谱、信号及监测信息上传至DSP进行解调，利用Simulink实现系统建模仿真；利用Verilog HDL实现各个数据通路模块，包括NCO模块、FIR滤波器模块和FFT模块等；搭建硬件平台，通过FPGA进行系统设计实现。整个系统监测频率范围从500 kHz~6 GHz，输出信号的信噪比达到50 dB以上，实现了对无线宽频谱信号的监测，达到了设计要求。%The system design for wireless signal monitoring in wide frequency range is realized in this paper based on the SR digital intermediate frequency reception theory. In this subject,the digital intermediate frequency receiver was achieved. The processed spectrum,signal and monitoring information is uploaded to DSP for demodulation. The modeling simulation in system level was realized by means of Simulink. All the data path modules,including NCO module,FIR filter module and FFT module were realized by the aid of Verilog HDL. The hardware platform was created and the prototype verification was performed through FPGA. The system′s monitoring range of frequency is 500 KHz~6GHz and SNR of output signal is more than 50dB. The system realized the monitoring function of wireless spectrum signal and met the design requirements.
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