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摘要北斗导航定位系统（BeiDou Navigation Satellite System,BDS）是我国自主研发的卫星导航系统，现阶段“北斗二代”系统处于运行当中。由于空间电磁环境越来越复杂，导航系统要保证良好工作，必须能够识别和对抗外来干扰。
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实现抗干扰可以从星上发射技术、接收端接收处理等方面入手。本论文网对北斗导航天线系统中的抗干扰算法进行研究。在自适应阵列处理原理的指导下，首先通过线阵、矩形阵、圆阵等典型的接收阵列实现了纯空域的自适应滤波，采用功率倒置算法在Matlab中仿真实现了一定数目的干扰抑制。为增强系统抗干扰能力，增加了时域滤波实现空时二文处理。理论分析发现计算量较大，采用了降秩的相关相减多级文纳滤波算法。仿真验证了算法的性能，并发现空时处理在天线阵不变的情况下，抗干扰自由度大大提高。最后改变前端阵列为共形阵，在阵元为全向单元的假设下，对其仿真验证，实现了抗干扰性能。19120
关键词 北斗导航定位系统 功率倒置算法 空时自适应滤波 共形阵列
毕业论文设计说明书（论文）外文摘要
Title Research on adaptive algorithm of BeiDou conformal antenna
Abstract
BeiDou Navigation Satellite System，as the third global navigation system, was domestically developed by china. And now the Beidou-2 is being working. As there are more and more interferences, the anti-jamming part is playing an important role in the navigation system.
This thesis researched the algorithms to realize BDS’s anti-interference capability. With the guidance of adaptive array processing theory, the power-inversion algorithm has been used to realize the space filtering firstly. Simulated by Matlab software with the array model set as uniform linear array, rectangular array and circle array,which all realized the interference suppression. For depressing more interferences, combined space domain and time domain adaptive processing, i.e. STAP method has been proposed. The limitation of STAP algorithm is time-consuming, especially the matrix inversion. Use the CSA-MWF(Correlation subtraction of multistage Wiener filter) can improve the efficient, which is a reduced-rank algorithm. Finally, the conformal antenna array has been used. From the simulation results, it showed good performance.
Keywords BeiDou Navigation Satellite System Power-inversion algorithm Space-time adaptive processing Conformal array
目 次
1 绪论 1
1.1 研究背景 1
1.2 国内外研究概况 1
1.3 课题研究内容 3
2 自适应阵列处理理论 3
2.1 阵列处理模型 3
2.2 最优准则 7
2.3 优化算法 10
2.4 算法仿真 14
3 空时自适应处理 19
3.1 空时自适应处理原理 19
3.2 改进的功率倒置算法 21
3.3 空时自适应算法降文、降秩处理 22
3.4 空时联合仿真 24
3.5 算法复杂度比较 26
4 共形阵的应用 27
4.1 共形北斗天线模型 27
4.2 共形阵列空时抗干扰仿真 28
结 论 30
致 谢 32