An automatic irrigation system with short message remote control is proposed to consider the requirement for automatic and intelligent irrigation remote control of the water and fertilizer in the drip irrigation system. The proposed system bases on SMS(Short Messaging Service)of the mobile communication network
and takes advantage of the message content dividing algorithm
frequency calculation and the subject extraction algorithm to process the remote control information received. Then binary commands for terminal units are generated by the system to perform irrigation controlling or state inquiry. The information to be fed back is firstly processed into PDU strings that conform to the format of SMS
and then transmitted to the user by a wireless transmission module through mobile communication network to display both the executing state in the field and the query results of the system. Moreover
this system has some certain self-learning and re-learning abilities. Its practical application in the agricultural demonstration fields in Chang An region of Xi'an in Shannxi Province shows that this system is suitable for applications in large acreage with its steadiness in running
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