Research On Several Problems Of Wireless Sensor Networks In Agriculture

With the development of sensor technology,wireless communication technology,mobile embedded technology and so on,because of the urgent needs of intelligent agriculture and precision agriculture,wireless sensor networks are widely used in modern agriculture.By using wireless sensor network in the agricultural environment,not only can reduce human consumption,but also remote and accurate access to agricultural environmental information and crop information.Thus achieving scientific cultivation,scientific management.However,due to the complexity of the agricultural environment,the performance of wireless sensor networks in agricultural applications is not as stable and robust as in industry applications.Based on the complexity of the agricultural environment,the Zigbee wireless network is took as the research object.In this paper,three aspects of signal intensity measurement,node power monitoring and frequency control strategy and remote diagnosis are studied.Agricultural environment is divided into facility agriculture and field agriculture.In the facility agriculture,The thickness and material of the agricultural greenhouse wall affect the information transmission between nodes.In the field agriculture,The height of the crop,field topography,field occlusion will affect the agricultural things.Because they all have a certain degree of interference to the node communication.In wireless sensor networks,the wireless transmission signals degression mode is different under different agricultural environment,different obstacles and different heights.Therefore,according to these two kinds of agricultural crowing environment,this paper carries out the signal strength from three aspects: height,obstacle and the distance between nodes,and finds out the most appropriate signal strength of Zigbee wireless sensor network under two kinds of agricultural planting environment.Agricultural production environment is a complex and open ecosystem.In the field of agriculture,wireless sensor network is commonly used in outdoor,unattended,Therefore,the reliability of the power supply is very important for the wireless node equipment which needs real-time acquisition and real-time control.In this paper,the power monitoring technology is used to monitor the power supply parameters in real time.This mode of power supply in the case of adequate solar radiation can effectively supply the system,However,when the Zigbee node encounters continuous overcast and rainy days and no other power supply,if the power supply is not added in time and the data receiving and transmitting in a high frequency mode,the device can not work normally.Based on this relationship,in order to ensure the normal and efficient operation of the nodes in the field without solar energy,this paper presents a control strategy based on the acquisition frequency of solar cells.On the basis of signal intensity monitoring technology and power monitoring technology,The state information of the hardware device is transmitted to the user through the communication system,so that the user can know the running state of the equipment,If the equipment fails,the user can understand the cause of the failure in the first time,and then make corresponding solutions.In order to reduce the cost of wireless sensor network in agricultural environment,this paper designs a Zigbee/GPRS gateway for agricultural environment.Zigbee/GPRS gateway uses Zigbee wireless communication technology,GPRS technology,RS232 communication technology,node data forwarding,Zigbee protocol and Internet protocol conversion.