基于小波变换的电力载波通信信号智能监测系统设计

Design of intelligent monitoring system for power carrier communication signal based on wavelet transform

为了解决传统实时通信信号智能监测系统受到噪声干扰而导致监测精准度低的问题,设计了基于小波变换的电力载波通信信号智能监测系统。依据监测系统下位机硬件结构,采用AD7705型号作为A/D数模转换器主要芯片进行模数转换。以看门狗的单片机芯片设计监测器,对转换数据进行监测处理。通过带阻滤波电路,改善滤波器周围信号频率特性,实现多路反馈。依据复位电路为系统提供复位脉冲,使电路恢复到初始状态,为下一次信号监测做好准备。设计软件流程,依据小波变换原理,对系统进行规避噪声处理,由此完成通信信号智能监测。在软硬件调试基础上进行仿真研究,由结果可知,该系统误码性能较好、监测精准度较高,在未来自动化监测系统中发挥重要作用。

In order to solve the problem that the traditional real-time communication signal intelligent monitoring system is disturbed by noise,which leads to low accuracy of monitoring,an intelligent monitoring system of power carrier communication signal based on wavelet transform is designed.According to the hardware structure of the lower computer of the monitoring system,AD7705 is used as the main chip of A/D digital-to-analog converter for analog-to-digital conversion. The watchdog MCU chip is used to design the monitor,and the converted data is monitored and processed. The band-stop filter circuit improves the frequency characteristics of the signal around the filter and realizes multichannel feedback. According to the reset circuit,the reset pulse is provided for the system to restore the circuit to its initial state and prepare for the next signal monitoring. The software flow is designed.According to the principle of wavelet transform,the system is processed to avoid noise,thus the intelligent monitoring of communication signals is completed. Based on the debugging of hardware and software,the simulation results show that the system has good error performance and high monitoring accuracy,and will play an important role in the future automatic monitoring system.