Research On Routting Protocols For Wireless Seismograph Sensor Network

The cableless of Self-storage seismograph is one of the important goals pursued in field operations. Meanwhile, the data can not be recovered in real time, which become a serious bottleneck that affects the actual applications. Wireless seismograph sensor network is composed of a large number of seismograph nodes, which has a broad application prospects in the field of geological exploration. Existing networking protocol can not be directly applied to the wireless seismograph sensor network. Field applications require networking protocols’energy to be small, exploration process requires a large number of seismographs nodes, and the amount of data on the nodes is also great. In order to recovery the state information and data in real-time, it’s necessary to research effective networking protocols according to the characteristics of seismic exploration, which is a key issue for wireless seismograph sensor networks.This thesis is based on the important public welfare projects of the state--No-cable seismic exploration system, focuses on the network protocol of banded physical topology and square-shaped physical topology. Main tasks are summarized as follows:1) Analysis the distributed address assignment algorithm of Cluster-Tree, as it can not meet the hundred hops’demand of Wireless seismograph sensor network, this thesis proposes a distributed address assignment algorithm based on the maximum-depth tree with a limited degree, according to the characteristics of banded physical topology, by limiting number of routing node at each level of the tree structure to reduce the number of reserved address, which greatly expanded maximum depth of the network. The algorithm is simulated and analyzed in the end.2) Based on the improved address assignment algorithm, this thesis the designed and implement a new network protocol according to the characteristics of strip physical topology. From three aspects:when the nodes wake up, how to choose parent node and how to solve the problem that the main line wrap. And the routing mechanism is improved, finally put forward the route maintenance mechanism, which solves the problems of large area network failure when main line node is disconnected.3) This thesis studies the improved weighted centroid strategy based on RSSI and proposes the mechanism of dynamic access of path loss exponent, which improves the positioning accuracy. And design the mechanism that squares shaped topology is divided into strip topologies and then each sub is networking separately. In the end design the network mechanism and maintenance mechanism.4) The networking protocols of strip physical topology and square-shaped physical topology are simulated separately on the platform of OMNET++. The simulation studies the effects of the length of strip topology and network node density on banded physical topology, and the effects of the size of topology cutting and topology scale on square-shaped physical topology. Finally realize the networking protocol of the strip physical topology in the embedded platform and make a networking test.