海上无人船自组网随机接入仿真研究*

海上无线通信具有传播环境复杂、多径干扰、信号衰减和时延较大等特点,传统的通信传输系统无法满足无人船之间、岸船之间稳定可靠的通信业务需求。针对海气界面组网观测中以无人船为核心的快速机动组网协同观测任务,研究基于信道感知的无人船自组网随机接入协议,采用优先级机制满足海上环境下网络负载较大时敏业务的低延迟传输需求,为无人船组网观测信息传递提供可靠性和实时性保证。终端采用一发多收机制提高数据传输成功率和网络系统吞吐量。最后,基于OPNET搭建仿真网络模型,从接入成功率、平均端对端时延、系统吞吐量等方面仿真分析所设计的随机接入协议性能。

Random access technique for unmanned surface vehicle ad-hoc network

Maritime wireless communication has the characteristics of complex propagation environment, multi-path interference, signal attenuation and time delay. The traditional communication transmission system can not meet the requirements of stable and reliable communication between unmanned surface vehicles and shore. Aiming at the cooperative observation task of fast maneuvering network with unmanned surface vehicles as the core in air sea interface network observation, a channel aware random access protocol for unmanned surface vehicles Ad-hoc network is studied. The priority mechanism is adopted to meet the low delay transmission requirements of time sensitive services with large network load in the marine environment, and provide reliable and real-time guarantee for the transmission of observation information of unmanned surface vehicles Ad-hoc network. At the same time, the network communication terminal adopts the mechanism of "one send and multiple receive" to improve the success rate of data transmission and the throughput of network system. Finally, the network model is built based on OPNET simulation tool, and the performance of the designed random access protocol is simulated and analyzed from the aspects of access success rate, average end-to-end delay and system throughput.