Research On Anchor Node Selection Strategy Of Reactive Localization For Underwater Acoustic Sensor Networks

More and more people pay attention to underwater sensor network research,it has a wide range of applications,such as monitoring underwater environment,marine data acquisition,shoreline protection and disaster prevention etc.Due to acoustic wave in the sea more resistant than the attenuation of radio and light waves,and so acoustic communication technology communication technology is typically used in underwater sensor networks,namely,underwater acoustic sensor networks(UASNs).However,active positioning technology applied in the underwater acoustic network will make network traffic increases,high energy consumption.Underwater acoustic channel has many characteristics,for example,serious path loss,multipath propagation,Doppler shift,big propagation delay and so on.As a result of the drift of ocean currents,underwater acoustic sensor network has lots of characteristics different from WSN,for instance,high mobility,low reliability,low position accuracy,three dimension space,etc.The characteristics of underwater acoustic sensor network causes that location technology in WSN can not be directly applied to underwater acoustic sensor networks.It put forward a great challenge to network underwater life.Similar to active positioning,reactive localization in UASNs also played an important role,which is better than that of active positioning technology,especially in the aspect of network energy consumption and traffic.At present,the theoretical analysis of positioning technology in UASNs research focused on active positioning.However,reactive positioning can express more practical purpose of sensor network applications.Therefore,this article will discuss the anchor node selection strategy in the reactive positioning.The research details of this paper are as follow: First,we analyze the traditional passive underwater positioning network,respectively,from the channel model energy model and perception model.An improvement measure was put forward to the original location schemes.Secondly,for the original low energy self-healing algorithm based on the single biggest intersection,this paper proposes a low energy self-healing algorithm based on comprehensive weighting.In the network initialization,completing the process of selection of redundant anchor node and the node would select the appropriate anchor node when anchor node in low energy,then network is repaired.The simulation data show that the proposedalgorithm can reduce network traffic,improve the efficiency of the network.Finally,the existing sudden crash self-healing algorithm,the network energy consumption as perceived collapse event increased with increasing of the number of nodes,the network life cut short.Based on this,this paper puts forward an improved algorithm,namely the anchor node crash self-healing algorithm based on redundancy backup,the sensing nodes wake up corresponding suboptimal anchor nodes when the anchor node crashes.and through simulation experiment to validate it.Results show that the improved algorithm is better than the original algorithm to reduce the energy consumption and prolong network lifetime.