Study On Key Techniques Of Underwater Wireless Communication Framework Network

With the development of navy and coast defense, it becomes very importance in the modernization naval battle that underwater naval ships forming into columns. Studying and founding underwater communication ad-hoc network for build modern navy is very impendency. Underwater communication ad-hoc network is important matter and research aspect in underwater communication and key technique in underwater naval ships forming into columns. This text aim at communicate application in underwater naval ships forming into columns, study on key technique in underwater communication ad-hoc network, design distributing structure in underwater ad-hoc network, establish communicate protocols and network security in underwater ad-hoc network. This test researching effort and consequence are 5 pinots.1) Analyze technical characteristic of underwater node, and base on wirelesses ad-hoc network, design delimitations distributed structure and plane structure, confirmation protocols stack of node and routing list structure for ad-hoc network. This structure offers network forming for underwater communication in inequality nodes of large form into columns and equality nodes of little form into columns.2) Aiming at multi-nodes sending data packages in the same time, ALOHA MACA in MAC protocols, availability of channel is low, give in a kind of priority media priority access control protocol. This protocol adopts contrast information mark strategy, it guarantees important information can be priority transmission, settlement channel collision; enhance channel availability of important information.3) Research routing algorithm of underwater ad-hoc network. Bring up a kind of multi-route Ad-Hoc On-Demand Distance-vector, the algorithm adopt multi-nodes routing switch mechanism, after a link failure attach standby node conform new link for transmit data package. The MAODV shorten preventive maintenance time, descend lost of data package and enhance routing algorithm ability of AODV.4) Assay and research safety factor of underwater ad-hoc network, aim at intercepting, masquerading and natural interference and so on, put forward two cure for safe factor of underwater ad-hoc network. Pass enciphering to routing information, avoiding intercepting, guaranteeing routing safe. Pass asking identity information, can identification masquerading and nature interference.5) Based on OPNET software, install tri-level simulation model of underwater communication ad-hoc network. Simulate structure of network, protocol stack of node, MAC protocol and routing algorithm, and network safe. Get channel availability and so on. Findings offer reference for underwater communication ad-hoc network, and offer approach for naval ships of underwater communication.