基于DSP的微波光子信号监测系统的设计

Design of Microwave Photon Signal Monitoring System Based on DSP

射频信号的监测具有广泛的应用前景,文章提出了一种基于DSP的微波光子射频信号监测系统。该系统由前端微波光子信号接收部分和后端信号处理部分组成,射频信号经光学下变频处理得到中频信号,经过ADC模数转换后在DSP上应用快速傅里叶变换(FFT)算法完成对接收信号的频谱分析。实验测试结果表明,该系统可以完成对射频信号的监测,频率测量误差小于0.25 MHz,动态范围为55 dB,灵敏度为-30 dBm。此外,为了进一步验证,应用天线进行手机信号的接收实现了对手机信号通信频段的实时监测。

The monitoring of radio frequency signals has broad application prospects.A microwave photon Radio Frequency(RF)signal monitoring system based on DSP is proposed.The system consisted of the front-end microwave photonic signal receiving part and the back-end signal processing part.The RF signal was processed by optical down-conversion to get the Intermediate Frequency(IF)signal.After the Analog-to-Digital conversion,the FFT algorithm was applied on DSP to complete the spectrum analysis of the received signal.The experimental results show that the system can complete the RF signal monitoring.The frequency measurement error is less than 0.25MHz,the dynamic range is 55dB,and the sensitivity is-30dBm.In addition,for further verification,the antenna was used to receive the mobile phone signal to realize the real-time monitoring of the mobile phone signal communication frequency band.