本文關鍵詞：高速移動通信鏈路信道特性及模型研究　出處：《北京理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 高速移動衛(wèi)星通信 信道特性 信道模型 通信系統(tǒng)控制軟件 C#

【摘要】：快速發(fā)展的衛(wèi)星移動通信具有覆蓋范圍廣、工作頻帶寬、通信效率和靈活度高等特點。非靜止軌道衛(wèi)星軌道高度低、運動速度高，導致信道特性復雜且隨時間動態(tài)變化，因此，對其通信鏈路的研究是衛(wèi)星移動通信領域的難點和重點之一。 本文對非靜止軌道衛(wèi)星通信系統(tǒng)的衛(wèi)星與地面終端和星間兩種高速移動通信鏈路的信道特性及模型進行了研究。針對鏈路的信道特性，詳細研究和仿真了衛(wèi)星軌道估計算法，并選用基于SGP模型的軌道估計算法對衛(wèi)星與地面終端通信鏈路的路徑損耗、傳播時延、多普勒頻移及其變化率等信道特性進行了分析和仿真；另外，通過分析星間鏈路的空間幾何關系，對同等高度和不等高度星間鏈路的信道特性進行了計算和仿真。針對鏈路的信道模型，詳細分析了C.Loo和Corazza兩種窄帶信道模型，并提出一種六徑信道模型，該模型可以通過調整路徑個數(shù)和模型參數(shù)實現(xiàn)不同的寬帶和窄帶信道模擬。另外，基于六徑信道模型，分析和提取了三種典型終端環(huán)境下的模型參數(shù)。 在上述分析和仿真的基礎上，本文設計和實現(xiàn)了高速移動通信鏈路控制軟件。該軟件能夠利用衛(wèi)星和地面終端參數(shù)或星間鏈路的衛(wèi)星參數(shù)實時計算鏈路的信道特性，并將信道特性與模型參數(shù)通過網(wǎng)絡通信傳送至專用信道模擬器，使專用信道模擬器完成對相應信道的模擬。另外，，該軟件還可以完成對通信終端調制方式、符號速率等參數(shù)的控制，并在測試平臺工作過程中實時對系統(tǒng)的性能進行評估。最后，本文對控制軟件的參數(shù)計算、可視化顯示、網(wǎng)絡通信及系統(tǒng)性能評估等主要功能進行了測試，驗證了軟件功能的完善性。 設計非靜止軌道衛(wèi)星通信鏈路系統(tǒng)時，研究鏈路信道特性并建立準確的信道模型、探索高效信道估計算法，對于實現(xiàn)高可靠性的衛(wèi)星移動通信具有重要的研究意義，也是本文致力研究和解決的主要問題。
[Abstract]:The rapid development of satellite mobile communication has the characteristics of wide coverage, wide operating bandwidth, high communication efficiency and high flexibility, etc. The orbit height of non-geostationary orbit satellite is low, and the moving speed of non-geostationary orbit satellite is high. Because of the complexity of the channel characteristics and the dynamic changes with time, the research of the communication link is one of the difficulties and emphases in the field of mobile satellite communication. In this paper, the channel characteristics and models of two kinds of high-speed mobile communication links between satellite and ground terminal and between satellites in non-geostationary orbit satellite communication system are studied. The satellite orbit estimation algorithm is studied and simulated in detail, and the path loss and propagation delay of the satellite and ground terminal communication link are selected based on the orbit estimation algorithm based on SGP model. The channel characteristics such as Doppler frequency shift and its change rate are analyzed and simulated. In addition, by analyzing the spatial geometric relationship of the intersatellite link, the channel characteristics of the same height and unequal altitude intersatellite links are calculated and simulated. Two narrowband channel models, C.Loo and Corazza, are analyzed in detail, and a six-path channel model is proposed. The model can adjust the number of paths and model parameters to achieve different broadband and narrowband channel simulation. In addition, based on the six-path channel model, the model parameters in three typical terminal environments are analyzed and extracted. Based on the above analysis and simulation. In this paper, a high speed mobile communication link control software is designed and implemented, which can calculate the channel characteristics of the link in real time using the satellite and ground terminal parameters or the satellite parameters of the intersatellite link. The channel characteristics and model parameters are transmitted to the special channel simulator through the network, so that the special channel simulator can simulate the corresponding channel. In addition, the software can also complete the modulation mode of the communication terminal. Control of parameters such as symbol rate, and real-time evaluation of the performance of the system in the process of testing platform. Finally, this paper calculates the parameters of the control software, visual display. The main functions such as network communication and system performance evaluation are tested to verify the perfection of the software function. When designing the non-geostationary orbit satellite communication link system, the link channel characteristic is studied, the accurate channel model is established, and the efficient channel estimation algorithm is explored. It is of great significance to realize high reliability satellite mobile communication, and it is also the main problem that this paper devotes to study and solve.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN927.23

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本文編號：1357004