基于卫星重叠通信技术的搜救系统研究

发布时间：2018-04-21 21:09

本文选题：搜救系统 + 重叠通信　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：利用卫星通信转发遇险的报警和定位信息是现有科技条件下最有效的搜救手段。针对我国卫星搜救系统建设中存在的不能全域覆盖和全天候服务问题,本文研究了基于卫星重叠通信技术的搜救系统。该系统不用专门发射卫星,而是借助可视空域内任一通信系统的卫星转发器转发搜救信号,大大节约建设成本。只要遇险目标上空有卫星,系统就能正常工作,不受服务区域和服务时间的限制。论文的主要研究成果如下:1.在研究了卫星重叠通信技术基础上,设计了一种基于卫星重叠通信的搜救系统方案;根据搜救系统的需求,进行目标卫星、载波的参数的选择,并通过链路预算论证了设计方案的可行性;根据链路预算结果,设计了基于M元扩频的搜救信号的突发传输体制和信道编码方式;并通过仿真验证了所设计传输体制满足了设计要求。2.针对所设计搜救信号传输体制,设计了搜救信号的同步帧头,以及基于FFT的搜救信号同步帧头的捕获方法;仿真结果表明,所设计的同步捕获方法在极低信噪比下具有良好的突发帧头的捕获性能。
[Abstract]:Using satellite communication to transmit distress alarm and location information is the most effective search and rescue method under the existing scientific and technological conditions. In order to solve the problem of non-coverage and all-weather service in the construction of satellite search and rescue system in China, this paper studies the search and rescue system based on satellite overlapping communication technology. Instead of specially launching satellites, the system transmits the search and rescue signals by using the satellite transponders of any communication system in the visual airspace, which greatly saves the construction cost. As long as there are satellites above the target in distress, the system will work without limitation of service area and service time. The main research results of this paper are as follows: 1. On the basis of studying the technology of satellite overlapping communication, a scheme of search and rescue system based on satellite overlapping communication is designed, and the parameters of target satellite and carrier are selected according to the needs of search and rescue system. According to the result of link budget, the burst transmission system and channel coding method of search and rescue signal based on M-element spread spectrum are designed. The simulation results show that the designed transmission system meets the design requirements. 2. 2. Aiming at the design of search and rescue signal transmission system, the synchronous frame head of the search and rescue signal and the acquisition method of the search and rescue signal synchronous frame head based on FFT are designed, and the simulation results show that, The proposed synchronization acquisition method has good acquisition performance of burst frame heads at very low signal-to-noise ratio (SNR).
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

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