發(fā)布時間：2018-04-21 21:09

  本文選題：搜救系統(tǒng) + 重疊通信　； 參考：《西安電子科技大學》2014年碩士論文

【摘要】：利用衛(wèi)星通信轉發(fā)遇險的報警和定位信息是現(xiàn)有科技條件下最有效的搜救手段。針對我國衛(wèi)星搜救系統(tǒng)建設中存在的不能全域覆蓋和全天候服務問題,本文研究了基于衛(wèi)星重疊通信技術的搜救系統(tǒng)。該系統(tǒng)不用專門發(fā)射衛(wèi)星,而是借助可視空域內(nèi)任一通信系統(tǒng)的衛(wèi)星轉發(fā)器轉發(fā)搜救信號,大大節(jié)約建設成本。只要遇險目標上空有衛(wèi)星,系統(tǒng)就能正常工作,不受服務區(qū)域和服務時間的限制。論文的主要研究成果如下:1.在研究了衛(wèi)星重疊通信技術基礎上,設計了一種基于衛(wèi)星重疊通信的搜救系統(tǒng)方案;根據(jù)搜救系統(tǒng)的需求,進行目標衛(wèi)星、載波的參數(shù)的選擇,并通過鏈路預算論證了設計方案的可行性;根據(jù)鏈路預算結果,設計了基于M元擴頻的搜救信號的突發(fā)傳輸體制和信道編碼方式;并通過仿真驗證了所設計傳輸體制滿足了設計要求。2.針對所設計搜救信號傳輸體制,設計了搜救信號的同步幀頭,以及基于FFT的搜救信號同步幀頭的捕獲方法;仿真結果表明,所設計的同步捕獲方法在極低信噪比下具有良好的突發(fā)幀頭的捕獲性能。
[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).
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN927.2

【參考文獻】

相關期刊論文 前1條

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本文編號：1784103