SimpliciTI网络频率捷变机制的研究  

Research on Frequency Agility Mechanism in SimpliciTI Network

作　　者：杨宁[1] 史仪凯[1] 袁小庆[1] 黄磊[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《传感技术学报》2011年第12期1739-1743,共5页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(50275125);国家航空科学基金项目(2007ZE53050)

摘　　要：针对SimpliciTI网络存在着跳频盲目性和通信初始信道易受到干扰的问题,引入FA帧模型,提出一种改进的频率捷变方案。该方案根据FA帧的同步码信息,采用时钟同步法构建网络的主从同步体系;通过SimpliciTI信道模型计算出的RSSI阀值,使频率捷变次数相对降低,进而提高网络的抗干扰能力和频谱利用率。研究结果表明,在40个通信节点的网络规模下,FA帧中同步码的错误检测概率与假同步概率均仅为0.13%,网络同步时钟的误差达到1.2ms,改进算法的频道切换次数平均降低3次。A developed frequency agility（FA）method with FA frame model was proposed,intended to address the problem of the frequency-hopping blindness and the initial communication channel instability occurring in existing SimpliciTI protocol.The newly-elaborated method utilizes clock synchronization approach to establish master-slave synchronization network according to synchronous code of FA frame.Meanwhile,on the basis of RSSI threshold calculated by SimpliciTI channel model,the number of frequency agility is relatively reduced,thus the network anti-jamming ability and frequency spectrum efficiency are obviously improved.The experiment shows that the probability of error detection and the probability of false synchronization are only 0.13%.For the meantime,the synchronous clock error could be reduced to 1.2ms and the frequency of channel-switching averagely reduces 3 times.

关 键 词：无线传感器网络 SimpliciTI 频率捷变 RSSI 主从同步 

分 类 号：TP393.17[自动化与计算机技术—计算机应用技术]