基于Hilbert变换的害虫自动计数和发布系统的设计

基于希尔伯特变换(Hilbert),设计了害虫自动计数和远程发布预警系统。系统主要由杀虫灯、采集卡、变压器、PC机、可编程逻辑控制器(PLC)、路由器等硬件设备组成,运行时,杀虫灯高压网端的电压信号经变压器降压,采集卡采集降压后的杀虫网电压,采集卡通过USB口与PC机相连,PLC通过串口与PC机相连。用Lab VIEW软件作为平台,对采集到的信号进行Hilbert变换,得到信号的瞬时幅值,当瞬时幅值小于设定值时,通过串口给PLC发送Modbus指令,PLC接收到指令后对相应寄存器进行计数。利用PLC和My SCADA组态软件对PLC寄存器数据进行远程发布,手机端、远程桌面端都可监测现场害虫计数值。对采集到的714只害虫触网扰动信号进行分析,从中任意选4组共7个扰动信号进行演示,结果系统能准确识别7个扰动区,并通过手机端和远程桌面端显示。

Design of pest counting and publishing system based on Hilbert transformation

Based on Hilbert transformation, a pest counting system and remote publishing system were designed and established. The system was composed of pest–killing lamp, acquisition card, voltage transformer, PLC, and router, etc. Under operation, the voltage from pest–killing lamp was reduced by voltage transformer, and then collected by acquisition card, which connected with PC by USB. LabVIEW was used to complete the Hilbert process to obtained the instantaneous value. When the instantaneous was less than the set value, modbus instruction was sent to PLC serial port, and PLC will count at receiving corresponding instruction. PLC and MySCADA were introduced to attain remote publishing on mobile phone and computer. Disturbance information of 714 pests were analyzed, and totally 4 terms of 7 disturbance information were listed in the paper. The result showed that the system could precisely identify 7 disturbance area, and display by mobile phone and remote computer.