基于互联网的农业自动灌溉控制系统数据实时推送设计与开发

Design and Development of Real Time Data Push in Web-based Automatic Irrigation Control System

基于Web的自动灌溉控制系统是当前农业节水信息技术发展的主流趋势，针对基于Web的应用程序在实时性上表现较差而难以满足应用需求这一问题。首先分析了基于Web的自动灌溉控制系统的结构和数据传输实时性瓶颈，提出了通过数据推送模式提高实时性的方案，并对数据层与逻辑层、逻辑层与表现层之间的具体数据推送模式进行了设计。通过编程开发完成基于web的灌溉控制系统的构建，实现了数据实时推送的机制，并对系统数据采集和控制指令发送过程的实时性进行测试。结果表明：数据采集平均延时为1676ms，控制数据从发送到结果返回的平均延时为3378ms，基本能够满足其设备控制和灌溉决策的需要：软件系统内采集和控制过程的数据库至客户端数据传输的平均延时分别为124ms和118ms，消除了数据拉取模式中的延时因素．对提高系统实时性起到了重要作用。该研究为基于Web的实时监测与控制系统的开发提供了方法参考。

Automatic irrigation control system based on Web is the main trend in the development of agricultural water-savin$ information technology.The application program based on Web in real-time performance is poor,so it is difficult to meet the application needs of this problem.In this paper, the structure and data transmission real-time bottleneck of automatic irrigation control system based on Web was analyzed, and the scheme to improve the real-time performance of data transmission mode was put forward.The construction of irrigation control system based on Web was developed, and the mechanism of data real-time push was realized, and the real-time performance of data acquisition and control instruction was tested. The results showed that the average delay of data acquisition was 1 676 ms,the average delay was 3 378 ms,which could basically satisfy the requirement of equipment control and irrigation decision.The average delay of data transmission was 124 ms and 118 ms.This study provided a reference for the development of real-time monitoring and control system based on Web.