直升机卫星通信关键技术研究与实现

发布时间：2018-03-17 09:54

本文选题：直升机卫星通信　切入点：信道模型　出处：《电子科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：直升机由于自身显著的在特点在民用和军用方面都有极其重要的作用,特别是在自然灾害的紧急处理和营救,军事战争的侦查,运输和支援等方面凸显了其重要性。在这些情况下,地面通信的网络有可能遭到自然灾害或者敌军的破坏而无法使用,直升机任务无法开展,这极大地限制了直升机的用途。使用稳定高速的直升机卫星通信,保证了直升机正常通信和使用,可以挽回经济损失,拯救生命,扭转战局等,因此研究直升机卫星通信,具有重要的价值。直升机卫星通信关键技术研究与实现,主要对象包括信道衰落模型、抗直升机旋翼遮挡通信和直升机卫星通信方案。本文首先对直升机卫星通信信道的特点进行分析,然后根据国内外大量权威的实验或统计数据,定性的分析了直升机卫星信道的特点并基于一些成熟的信道模型提出了直升机卫星通信信道的衰落模型,并使用MATLAB对其典型取值的分布进行了仿真分析。然后针对直升机旋翼遮挡,本文逐个仿真分析了卷积编码,交织编码,哈达玛矩阵变换,双重时间分集,空间分集和极化分集等手段对遮挡系统误码性能的改善情况,并比较了平均功率滑动窗口检测方法和判决反馈滑动窗口检测方法的遮挡检测技术性能。然后对这些方法进行了有机组合,仿真分析组合方法对遮挡系统性能的影响,总结出最优的抗遮挡通信组合方法。最后对于频带通信,本文结合传输的条件和抗遮挡通信的方法,首先对通信方案进行了设计,解决了传输过程中多普勒频移和直升机旋翼遮挡以及噪声影响等问题。然后对通信方案中采用的关键技术包括帧格式设计、载波同步、残留频偏补偿的设计原则进行了原理分析和仿真验证,最后在Xilinx的XC7K325T芯片上对通信方案的系统模块进行了FPGA实现,对载波同步和残留频偏补偿等关键模块的实现原理和结果进行了验证,并评估了硬件实现的资源消耗情况。
[Abstract]:Because of its remarkable characteristics in the helicopter in civil and military aspects are of great importance, especially in the natural disaster emergency rescue and investigation, military, transportation and support, highlighting its importance. In these cases, the ground communication network are likely to be hit by natural disasters or the destruction of the enemy to use the helicopter to carry out tasks, which greatly limits the use of helicopters. The use of stable helicopter satellite communication, to ensure the normal communication and the use of helicopters, can the economic losses, save lives, to reverse the situation, so the study of helicopter satellite communication, has important value. The research and implementation of key technologies of helicopter satellite the main object of communication, including the channel fading model, anti helicopter occlusion communication and helicopter satellite communication scheme. Firstly, the helicopter Wei The characteristics of satellite communication channel are analyzed, then according to a large number of domestic and foreign authoritative experimental and statistical data, the qualitative analysis of the characteristics of the helicopter satellite channel and based on some mature channel model is presented in helicopter satellite communication channel fading model, and use the MATLAB for its typical value distribution are simulated and analyzed. Then the occlusion of the helicopter in this paper, by simulation analysis of the rotor, convolutional encoding, interleaving encoding, Hadamard matrix transform, dual time diversity, space diversity and polarization diversity and other means to improve the situation from the BER performance of the system, performance testing technology and compared the average power block sliding window detection method and decision feedback sliding window detection method. Then the organic the combination of these methods, the simulation analysis method of combination of occlusion of system performance, sums up the best anti block communication The combination method. Finally the method based on frequency communication, transmission conditions and anti blocking communication, the communication protocol was designed and solved in the process of transmission of Doppler frequency shift and helicopter rotor occlusion and noise problems. Then the key technologies of communication scheme adopted in the design including frame format, carrier synchronization. The design principle of residual frequency offset compensation of principle analysis and simulation verification, finally in the XC7K325T chip Xilinx of FPGA to realize the system module of communication scheme, implementation principle and results of the carrier synchronization and residual frequency offset compensation and other key modules are verified, and to evaluate the consumption of hardware resources.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：V243.1;TN927.2

【参考文献】