Research On Highly-reliable Wireless Sensor Network And Its Application

Wireless sensor network is a self-organized network composed of lots of sensor nodes with wireless communication capability and data processing capability.Using wireless sensor network to observe the marine environment as well as physical and chemical properties is of great value for marine research and has been widely concerned.However,due to the complexity of radio wave propagation in the marine environment,the data transmission methods of traditional wireless sensor networks,especially the time synchronization protocol of nodes and the reliable data aggregation method,are facing great challenges.Aiming to the research of marine wireless sensor networks,this paper mainly focuses on the highly reliable time synchronization scheme of nodes and the reliable data aggregation method.The specific work includes:Aiming at the problem that there are a lot of error packets when the time synchronization information is transmitted in the wireless channel,this paper proposes the flood time synchronization protocol based on coding,and adds forward error correction protection mechanism to the synchronization beacon frame that improves the reliability of the synchronization information transmission.Furthermore,performance testing is performed in the real environment.The test results show that the flood time synchronization protocol based on coding can improve the reliability of synchronization information transmission,enhance the accuracy of synchronization to a certain extent and prolong the lifetime of synchronization.Aiming at the problem that wireless sensor network communication performance is affected by the low reliability of sensor data transmission in marine environment,this paper designs a highly reliable transmission scheme based on distributed reception.Furthermore,the prototype test system of marine wireless sensor network is built,and the data transmission performance of the proposed highly reliable transmission scheme is tested in land and marine environment,respectively.The test results show that the highly reliable wireless sensor network based on distributed reception can realize the highly reliable reception of sensor data by the sink node and is suitable for real-time monitoring of interested environmental parameters in the marine environment.