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  本文選題：衛(wèi)星導航系統(tǒng) + 北斗衛(wèi)星信號　； 參考：《昆明理工大學》2013年碩士論文

【摘要】：開發(fā)現(xiàn)代的GNSS接收機中,應用軟件定義的無線電技術(shù)代表了演變過程中的一個階段。與用專用的集成電路的傳統(tǒng)接收機相反,軟件無線電通過可編程微處理器或數(shù)字信號處理器實現(xiàn)所有的數(shù)字信號處理。它將硬件中的模擬信號環(huán)境條件與軟件中的數(shù)字信號處理分離獨立開來,導致了很明顯的優(yōu)點,如：多�；�、多系統(tǒng)、多傳感器、測試和質(zhì)量控制及軟件開發(fā)的持續(xù)進行。這種信號處理方法在GNSS情況下顯得特別重要。軟件接收機是一種變得越來越重要的設(shè)計理念。實際的軟件接收機,處理有限的帶寬的信號,選擇連續(xù)頻帶的子帶,用現(xiàn)有的技術(shù)以軟件接收機加以實現(xiàn)。 GNSS軟件接收機的關(guān)鍵技術(shù)包括對衛(wèi)星信號的捕獲和跟蹤技術(shù),為了能夠跟蹤衛(wèi)星信號并進行信息解碼,就必須先用捕獲程序來監(jiān)測信號的存在。一旦檢測到,就必須取得一些必要參數(shù),傳送給跟蹤程序,再由跟蹤程序得到如導航電文這樣的有用信息。由此可見信號捕獲在研究GNSS軟件接收機過程中至關(guān)重要。 本文首先介紹了三種常用的衛(wèi)星導航系統(tǒng)的概況和主要特點,并重點分析了各衛(wèi)星導航系統(tǒng)的信號結(jié)構(gòu)和調(diào)制方式。從基礎(chǔ)的二進制隨機序列入手,介紹了M碼和GOLD碼的生成機理,引出了GPS衛(wèi)星的C/A碼分配規(guī)定。這項工作完成之后又介紹了衛(wèi)星信號的調(diào)制原理,從簡單的BPSK,到后來的BOC從原理入手,介紹了各自的特點,及應用范圍,并在Simulink環(huán)境下做了仿真。其次介紹信號處理方法的基礎(chǔ)上說明了對衛(wèi)星高頻信號的主要處理手段,包括采樣和量化等。最后,基于上述信號處理完成,本文開始討論導航衛(wèi)星軟件接收機三種比較常用的捕獲方法：串行捕獲、并行頻域捕獲和并行碼相位捕獲。通過M語言實現(xiàn)了上述三種方法,并以實際采集的GPS中頻信號為例,對較優(yōu)的并行碼相位方法進行驗證。
[Abstract]:In the development of modern GNSS receivers, the application of software defined radio technology represents a stage in the evolution process. In contrast to traditional receivers using ASIC, software radio performs all digital signal processing through programmable microprocessors or digital signal processors. It separates analog signal environment conditions in hardware from digital signal processing in software, resulting in obvious advantages such as multimode, multi-system, multi-sensor, testing and quality control, and continuous software development. This signal processing method is particularly important in the case of GNSS. Software receiver is an increasingly important design concept. The actual software receiver processes the limited bandwidth signal, selects the subband of the continuous band, and realizes it with the software receiver with the existing technology. The key technology of GNSS software receiver includes acquisition and tracking of satellite signal. In order to track and decode the satellite signal, it is necessary to monitor the existence of the signal by the acquisition program. Once detected, the necessary parameters must be obtained and transmitted to the tracker, which in turn obtains useful information such as navigation messages. This shows that signal acquisition is very important in the research of GNSS software receiver. This paper first introduces the general situation and main characteristics of three kinds of commonly used satellite navigation systems, and emphatically analyzes the signal structure and modulation mode of each satellite navigation system. Starting with the basic binary random sequence, the generation mechanism of M code and GOLD code is introduced, and the C / A code allocation rule of GPS satellite is introduced. After this work is finished, the modulation principle of satellite signal is introduced. From the simple BPSK to the later BOC, the characteristics and application range are introduced, and the simulation is done under the Simulink environment. Secondly, based on the introduction of signal processing methods, the main processing methods of satellite high frequency signals, including sampling and quantization, are explained. Finally, based on the above signal processing, this paper begins to discuss three common acquisition methods of navigation satellite software receiver: serial acquisition, parallel frequency domain acquisition and parallel code phase acquisition. The above three methods are realized by M language, and the better parallel code phase method is verified by taking the actual GPS intermediate frequency signal as an example.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4

【參考文獻】

相關(guān)期刊論文 前1條

1 曹沖;;衛(wèi)星導航接收機技術(shù)的發(fā)展趨勢[J];數(shù)字通信世界;2005年05期

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本文編號：1966400