本文選題：北斗　切入點：BOC　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在全球?qū)Ш较到y(tǒng)蓬勃發(fā)展的今天,各國相繼發(fā)展屬于自己國家的,具有獨立知識產(chǎn)權(quán)的導(dǎo)航系統(tǒng),我國的北斗導(dǎo)航系統(tǒng)應(yīng)運而生。而如何在眾多導(dǎo)航系統(tǒng)保持自身系統(tǒng)的不可干擾性,并盡可能的對他國導(dǎo)航系統(tǒng)形成干擾,是在導(dǎo)航戰(zhàn)背景下的關(guān)鍵命題。我國北斗導(dǎo)航系統(tǒng)采用BOC類調(diào)制方式,其信號特征與相關(guān)峰特征與GPS信號存在諸多不同,因此其抗干擾算法與GPS抗干擾算法研究存在很多不同,所以研究針對北斗導(dǎo)航信號的抗干擾算法,并將其進行實現(xiàn)是非常有必要的。這也是本文最大的創(chuàng)新之處。本論文的目標是為我國自主研發(fā)的北斗導(dǎo)航接收機設(shè)計相應(yīng)的抗干擾算法模塊,以在壓制性干擾源存在的條件下,能對干擾源所在方向形成波束零陷,從而對干擾信號形成壓制,提高接收機輸入端的信噪比。本論文選擇空時二維自適應(yīng)結(jié)構(gòu)作為本文的核心抗干擾結(jié)構(gòu)。首先,給出了空時二維自適應(yīng)結(jié)構(gòu)的整體框架構(gòu)造圖,該結(jié)構(gòu)的重點以及難點是如何快速且準確的確定各級濾波系數(shù)的權(quán)值系數(shù)。而對于權(quán)值系數(shù)如何確定的問題可以歸結(jié)為最優(yōu)系數(shù)的求解問題。其次,采用最優(yōu)化求解方法對其進行求解,最優(yōu)目標函數(shù)采用功率倒置準則進行確定,而最優(yōu)化方法方法采用約束LMS算法與拉格朗日算子法進行求解。在仿真結(jié)果部分,論文中分別給出了采用約束LMS算法與拉格朗日算子法得到的仿真結(jié)果。在本文中利用拉格朗日算子法,分別對線形天線陣和圓形天線陣性能,輸入干擾源角度對抗干擾算法性能的影響,以及雙干擾源條件下的仿真性能進行了分析和比對。同時,在本文中給出了空時二維自適應(yīng)濾波算法對導(dǎo)航信號質(zhì)量指標的影響,這也是首次將空時二維抗干擾算法應(yīng)用與BOC調(diào)制信號。最后值得一提的是,在本論文中引入了歸一化奇異值法對延遲深度進行求解從而避免了復(fù)雜的運算,這也屬于本文一個創(chuàng)新之處。最后,在硬件實現(xiàn)上,采用Xilinx公司生產(chǎn)的VC707板卡實現(xiàn)相關(guān)功能,其在實現(xiàn)上可以分為自適應(yīng)濾波模塊、協(xié)方差矩陣計算模塊以及權(quán)系數(shù)計算模塊。其中涉及的矩陣求逆運算采用LU分解實現(xiàn)。通過將結(jié)果導(dǎo)入上位機進行分析,可以得出結(jié)論,該算法是可行并有效的。本文的研究成果對北斗二代二期信號的抗干擾接收機研制都有重要的參考價值。
[Abstract]:With the vigorous development of global navigation system (GNSS), every country has developed its own navigation system with independent intellectual property right. The Beidou navigation system of our country arises at the historic moment. However, how to maintain the non-interference of its own system in many navigation systems and to interfere with the navigation system of other countries as far as possible, Beidou navigation system in China adopts BOC modulation mode, its signal characteristics and correlation peak characteristics are different from GPS signals, so there are many differences between its anti-jamming algorithm and GPS anti-jamming algorithm. So the anti-jamming algorithm for Beidou navigation signal is studied. And it is very necessary to implement it. This is also the biggest innovation of this paper. The goal of this paper is to design the corresponding anti-jamming algorithm module for Beidou navigation receiver, which is independently developed in our country. Under the condition of the existence of the suppressed interference source, the beam can be trapped in the direction in which the interference source is located, and thus the interference signal can be suppressed. In this paper, space-time adaptive structure is chosen as the core anti-jamming structure. Firstly, the whole frame diagram of space-time adaptive structure is given. The emphasis and difficulty of the structure is how to determine the weight coefficients of filter coefficients at all levels quickly and accurately. However, the problem of how to determine the weight coefficients can be reduced to the problem of solving the optimal coefficients. The optimal objective function is determined by power inversion criterion, while the optimization method is solved by constrained LMS algorithm and Lagrange operator method. The simulation results obtained by using constrained LMS algorithm and Lagrange operator method are given in this paper. In this paper, the performance of linear and circular antenna arrays is obtained by using Lagrange operator method, respectively. The influence of the angle of input interference source on the performance of anti-jamming algorithm and the simulation performance under the condition of dual interference source are analyzed and compared. At the same time, the effect of space-time adaptive filtering algorithm on navigation signal quality index is given in this paper. It is also the first time that space-time two-dimensional anti-jamming algorithm is applied to BOC modulation signal. Finally, it is worth mentioning that the normalized singular value method is introduced to solve the delay depth in this paper. This also belongs to the innovation of this paper. Finally, in the hardware implementation, the VC707 card produced by Xilinx Company is used to realize the related functions, which can be divided into adaptive filtering module. Covariance matrix calculation module and weight coefficient calculation module. The matrix inversion is realized by LU decomposition. By introducing the results into the upper computer for analysis, we can draw a conclusion. This algorithm is feasible and effective. The research results in this paper have important reference value for the development of anti-jamming receiver for Beidou second generation signal.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN967.1

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本文編號：1639292