网络传输丢包率对温室WSN测控系统的影响

Effect of packet loss probability of transmission on greenhouse WSN measurement and control system

针对温室无线传感器网络(WSN)测控系统中数据包易丢失的问题,通过对温室中一对强耦合因子温度和湿度进行解耦,建立温度、湿度非耦合的多输入多输出数学模型.在分析含数据传输丢包与时延的温室无线传感网络测控系统结构基础上,根据网络控制系统指数稳定的相关理论,分析了温、湿度离散控制系统指数稳定条件.利用Matlab中LMI工具箱,对系统的指数稳定性进行定量判断,求出满足温室WSN测控系统指数稳定的可行性解,在确保温室WSN测控系统指数稳定的情况下分析得出最大允许丢包率,为创建稳定的温室WSN测控系统提供理论依据.

Concerning the packets loss problem in greenhouse wireless sensor networks（WSN） measurement and control（M＆C） system, two important parameters in greenhouse environment, temperature and humidity, were decoupled, and a multi-input/multi-output mathematical model of non-coupling was pro- posed. Based on analysis of the structure of greenhouse WSN M＆C system, in which there were time-delay and packets loss during data transmission, the exponential stability condition of the system under the control of temperature and humidity was analyzed according to related theories of exponential stability in network control system. The exponential stability was quantitatively judged by linear matrix inequality of Matlab in order to determine stable feasible solution, and to obtain the exponential stability of the greenhouse WSN M＆C system. The maximum allowable rate of packet loss was obtained in the condition that the stability of the system was assured. The results provide theoretical foundation to establish stable greenhouse WSN M＆C system.