【作者】 李建辉；

【导师】 戴伏生；

【作者基本信息】 哈尔滨工业大学 ， 信息与通信工程， 2011， 硕士

【摘要】 为了满足各战场用户大容量信息共享和传输需要,数据链系统已成为不可缺少的部分。特别是随着一大批先进无人机、直升机等装备部队,研究一种适合空中运动平台之间,具有高灵活性、高带宽、支持IP的机载数据链系统具有重要的意义。本文将在分析外军数据链研究成果和现有机载数据链存在的问题的基础上,结合全球信息栅格(GIG)系统,给出机载数据链的总体设计构想和设计要求,然后采取自顶向下的方法介绍和研究数据链各层的设计方案。首先,提出了层次化的网络体系结构,将其划分为互联网层和数据链层两部分,并给出了在互联网层中建议采用的部分协议;在分析系统组网要求的基础上,讨论了现有数据链多址接入方案的优缺点,提出了一种适合机载数据链组网要求的多址接入方案——基于信道统计和业务优先级的多址接入方案,并对该方案做了详细分析;其次,研究了机载数据链的波形设计方案。通过分析现有数据链波形设计方案,提出了机载数据链波形设计整体要求,在此基础上给出了系统的帧结构设计方案;最后,详细研究了物理层多载波调制技术。在分析、对比三种多载波CDMA的基础上,选择MT-CDMA方案作为机载数据链的候选方案;结合机载数据链的工作场景,通过理论推导和Matlab仿真,详细分析了MT-CDMA方案在存在频率偏移信道条件下的性能;将此结果与其他多载波方案作比较,证明了MT-CDMA在机载数据链系统中的可行性。更多还原

【Abstract】 To meet the need of high capacity information sharing and transmission between each battlefield consumer, the data link becomes an essential system. Especially along with large numbers of advanced aerial platforms are equipped, such as UAV and helicopters, so it is very important to study an Airborne Data Link System with highly interconnected dynamic, high bandwidth and IP-based network.By analysis of existing achievement of foreign data link and the problems of ours, this paper carries the general designing speculation and request of Airborne Data Link according to Global Information Grid system. On this basis, system design scheme is introduced and studied by a Top-Down approach.At frist, the architecture of layered network is propounded and divided into two parts—Internet layer and Data-Link layer, andsome candidate protocols used in Internet layer are introduced. While the advantages and disadvantages of existing multiple-access schemes for Data Link are analyzed, a new multiple-access scheme suitable for the requirements of Airborne Data Link System is proposed. This scheme called "Statistics-channel and Priority-based Multiple Access" is introduced in detail. And then, the design of the Airborne Data Link waveform is researched.Analysising of the waveform-design of existing Data Link, the overall design requirements is put forward. On the basis of these requirements, frame structure is designed in detail.At last, multi-carrier modulation technologies in physical Layer are studied in detail. Based on analysis of three kinds of multi carrier CDMA technology, the MT-CDMA is chosen for Airborne Data Link. Combine the system operation scene, through mathematical derivation and Matlab software simulation, this paper analyzes the performance of MT-CDMA with carrier frequency offset. Finally, these results, compared with other multi-carrier scheme, prove that the proposal is feasible in the Airborne Data Link.更多还原