發(fā)布時(shí)間：2018-04-16 14:34

  本文選題：接收機(jī) + 導(dǎo)航信號(hào)捕獲　； 參考：《中北大學(xué)》2014年碩士論文

【摘要】：偽隨機(jī)碼的捕獲方法是擴(kuò)頻通信系統(tǒng)中的關(guān)鍵技術(shù)之一，伴隨著擴(kuò)頻技術(shù)的不斷發(fā)展以及新型導(dǎo)航信號(hào)的不斷出現(xiàn)，偽隨機(jī)碼捕獲技術(shù)也在不斷的改進(jìn)。對(duì)偽隨機(jī)碼的同步捕獲算法研究，國(guó)內(nèi)外研究學(xué)者從未間斷過(guò)。本文主要研究衛(wèi)星導(dǎo)航信號(hào)的捕獲算法，著重研究提高導(dǎo)航信號(hào)捕獲算法性能的一些關(guān)鍵技術(shù)環(huán)節(jié)，并對(duì)PMF-FFT捕獲算法原理進(jìn)行分析，在此基礎(chǔ)上針對(duì)本論文的技術(shù)要求進(jìn)行捕獲算法設(shè)計(jì)，最后在FPGA內(nèi)實(shí)現(xiàn)所設(shè)計(jì)的捕獲算法，并在接收機(jī)平臺(tái)上進(jìn)行實(shí)測(cè)。 首先，對(duì)開(kāi)展本論文研究的背景進(jìn)行描述，明確了文章的研究意義，確定了論文的研究方向。在分析擴(kuò)頻通信技術(shù)理論的基礎(chǔ)上，闡述了BPSK信號(hào)調(diào)制方式以及BOC信號(hào)調(diào)制方式，并分別介紹了這兩種調(diào)制方式的信號(hào)性能。 其次，詳細(xì)闡述了導(dǎo)航信號(hào)捕獲的原理，對(duì)一些影響捕獲模塊性能的關(guān)鍵技術(shù)如捕獲靈敏度的提高、多普勒頻移的影響等進(jìn)行了研究。簡(jiǎn)單介紹了幾種常用的捕獲算法，按照本論文的技術(shù)要求選取了性能較好的PMF-FFT捕獲方法進(jìn)行了理論上的分析，對(duì)該方法的重要特性進(jìn)行了數(shù)學(xué)上的推導(dǎo)，針對(duì)技術(shù)要求對(duì)北斗信號(hào)和GPS信號(hào)捕獲算法進(jìn)行了詳細(xì)設(shè)計(jì)，，并在Matlab環(huán)境下對(duì)此捕獲算法進(jìn)行了仿真，同時(shí)對(duì)BOC信號(hào)的捕獲方法進(jìn)行了分析和研究。 最后，根據(jù)本文分析設(shè)計(jì)的PMF-FFT捕獲算法，依托于高速發(fā)展的FPGA數(shù)字技術(shù)，在兼顧捕獲時(shí)間和資源的基礎(chǔ)上對(duì)捕獲模塊進(jìn)行了設(shè)計(jì)，在DSP-FPGA接收機(jī)平臺(tái)上利用VerilogHDL語(yǔ)言對(duì)算法進(jìn)行實(shí)現(xiàn)，并詳細(xì)介紹了載波生成、偽碼生部分、部分匹配濾波器等關(guān)鍵環(huán)節(jié)FPGA的實(shí)現(xiàn)方法。最后利用接收機(jī)平臺(tái)進(jìn)行實(shí)測(cè)，驗(yàn)證了所設(shè)計(jì)并實(shí)現(xiàn)的捕獲模塊的可用性。
[Abstract]:The acquisition method of pseudorandom code is one of the key technologies in spread spectrum communication system. With the continuous development of spread spectrum technology and the emergence of new navigation signals, pseudorandom code acquisition technology is constantly improved.The research on the synchronization acquisition algorithm of pseudorandom codes has never been interrupted by domestic and foreign researchers.In this paper, the acquisition algorithm of satellite navigation signal is studied, and some key technologies to improve the performance of navigation signal acquisition algorithm are studied, and the principle of PMF-FFT acquisition algorithm is analyzed.On this basis, the acquisition algorithm is designed according to the technical requirements of this paper. Finally, the designed acquisition algorithm is implemented in FPGA and measured on the platform of the receiver.Firstly, the background of this paper is described, the significance of the research is clarified, and the research direction is determined.On the basis of analyzing the theory of spread spectrum communication technology, the modulation mode of BPSK signal and the modulation mode of BOC signal are expounded, and the signal performance of these two modulation modes are introduced respectively.Secondly, the principle of navigation signal acquisition is described in detail, and some key technologies that affect the performance of acquisition module, such as the improvement of acquisition sensitivity and the influence of Doppler frequency shift, are studied.In this paper, several commonly used acquisition algorithms are briefly introduced. According to the technical requirements of this paper, the PMF-FFT capture method with better performance is selected for theoretical analysis, and the important characteristics of the method are derived mathematically.The Beidou signal and GPS signal acquisition algorithm is designed in detail according to the technical requirements, and the acquisition algorithm is simulated under the Matlab environment. At the same time, the acquisition method of the BOC signal is analyzed and studied.Finally, according to the analysis and design of the PMF-FFT acquisition algorithm in this paper, based on the high-speed FPGA digital technology, the capture module is designed on the basis of both the acquisition time and the resource.The algorithm is implemented on the platform of DSP-FPGA receiver using VerilogHDL language. The implementation methods of FPGA, such as carrier generation, pseudo code generation, partial matched filter, are introduced in detail.Finally, the availability of the acquisition module is verified by using the receiver platform.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN96.1

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 張憲國(guó);高動(dòng)態(tài)環(huán)境下MSINS/GNSS組合導(dǎo)航系統(tǒng)研究[D];中北大學(xué);2015年

本文編號(hào)：1759356