跟踪与数据中继卫星系统多址干扰抑制技术研究

发布时间：2018-05-21 10:54

本文选题：跟踪与数据中继卫星 + 多目标通信　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：随着我国航天技术与航天工程的快速发展，以往以陆基与海基为主的空间通信网很难满足对低轨卫星通信覆盖率的要求，同时也很难实现多用户、多任务的协调合作与多信息的处理，这也就要求扩展现有的空间通信网络以提高网络的覆盖范围以及多目标信号处理的能力。利用TDRSS（Tracking andData Relay Satellite System，跟踪与数据中继卫星系统），不仅可以通过大幅提高通信网络覆盖率来实现同时与多个低轨卫星之间全程无间断实时通信，而且数据中继卫星还可以起到在地面站和用户星之间进行数据的高速中继的作用。未来空间任务中，将需要空间站及低轨卫星之间的协同作业。而要与多个用户卫星同时进行通信，，则对每个卫星发送的信号来说都会有来自其他卫星的多址干扰的影响。所以，实现中继卫星系统对多个低轨卫星同时、可靠高速通信与数据的传输是亟待解决的。本论文将真对上述问题研究中继卫星系统空间S波段多用户通信的多址干扰抑制技术。本文首先对TDRSS多用户通信网络进行了介绍，然后对其链路模型进行了计算。其次，对TDRSS系统的前向链路与返向链路的系统的总体框图进行设计与分析。再次，确定前向链路与返向链路的多址干扰抑制方案，并提出了级联的最优判决函数映射与门限分类的返向链路多址干扰抑制方案。相比非级联的最优判决函数映射与门限分类的方法性能更加突出。对前向链路与返向链路多址干扰抑制算法的误码率性能，多用户容量性能，以及抗远近效应的能力进行了仿真分析，并对前向与返向链路算法的误码率性能进行对比，得出两种算法各自的特点以及分别应用于前向链路与返向链路的可行性。最后，为了满足TDRSS系统的通信性能的要求，将RS码与卷积码的级联编码运用于TDRSS前向与返向链路中，极大的降低了系统的误码率。
[Abstract]:With the rapid development of space technology and space engineering in our country, the space communication network based on land and sea is difficult to meet the requirements of low orbit satellite communication coverage, and it is also very difficult to realize multi-user. The coordination and cooperation of multi-tasks and the processing of multi-information require the expansion of the existing space communication network to improve the coverage of the network and the ability of multi-target signal processing. With the help of TDRSS(Tracking andData Relay Satellite System, tracking and data relay satellite system, not only can the coverage of communication network be greatly increased, but also the whole uninterrupted real-time communication with multiple Leo satellites can be realized at the same time. And the data relay satellite can also act as a high-speed relay between the earth station and the user satellite. Cooperation between the space station and Leo satellites will be required for future space missions. In order to communicate with multiple user satellites simultaneously, the multiple access interference (mai) from other satellites will affect the signals transmitted by each satellite. Therefore, it is urgent to realize reliable high-speed communication and data transmission for multiple Leo satellites. In this thesis, we will study the multiple access interference (mai) suppression techniques for space S band multiuser communication in relay satellite systems. In this paper, the TDRSS multiuser communication network is introduced, and its link model is calculated. Secondly, the overall block diagram of forward link and back link of TDRSS system is designed and analyzed. Thirdly, the multiple access interference suppression scheme for forward link and back link is determined, and the concatenated optimal decision function mapping and threshold classification are proposed. Compared with the non-cascaded optimal decision function mapping and threshold classification, the performance of the method is more outstanding. The bit error rate (BER) performance, the multi-user capacity performance and the ability to resist the near-far effect of forward link and back link multiple access interference suppression algorithm are simulated and analyzed, and the error rate performance of forward and back link algorithms is compared. The characteristics of the two algorithms and the feasibility of applying them to forward link and back link are obtained. Finally, in order to meet the requirements of communication performance of TDRSS system, the concatenated coding of RS code and convolutional code is applied to the forward and back link of TDRSS, which greatly reduces the bit error rate of the system.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

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