Study on Crop Irrigation System Based on the VirtualInstrument Technique

摘要

This research aims at exploring three main factors during the crop different growth periods:certain crop water requirement, its relative soil moisture content and environment temperature,based on which an intelligent signal processing system in crops irrigation management with virtualinstrumentation was developed by Nation Instruments’ graphical programming LabVIEW. The wholeprocessing system was divided into three parts: signal acquisition, processing and control output.Firstly, dielectric properties, soil moisture content and temperature information were acquired by theirrelevant sensors with NI PCI-6024E data acquisition(DAQ) broad. Meanwhile, GPS informationreceived by GPS MAP330 was to position the sampling synchronously through RS-232 serialinterface. Afterwards, signals both from DAQ-6024E broad and GPS receiver were all combined intothe system with other crop knowledge in Access database to analyze its corresponding waterrequirement situations. Finally, according to the analysis results, fuzzy control aided by NI controltoolkit was sent out signals to irrigation execution units. In this system, many basic informationoperations functions, such as data display, store and analysis were provided. Especially, it hasaccomplished a GIS function, making watering spot and its corresponding information visible tooperators in GIS map, which was convenient for operators to master both current and basic irrigationinformation. In one word, the whole system has shown its great intelligent functions on signalsacquisition, analysis, control compared with traditional ones.