北斗导航终端天线与抗干扰算法的研究及实现

发布时间：2018-01-09 02:09

本文关键词：北斗导航终端天线与抗干扰算法的研究及实现　出处：《南京理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：全球卫星导航系统是极其重要的空间设施,在军民等领域应用非常广泛。它具有重大的政治、社会和军事意义。北斗导航系统是我国现在正在自主研发并且独立运行的导航系统。考虑到北斗导航终端设备的便携性,设计的天线在满足性能指标的同时尺寸要尽量小。另外,北斗导航用户端的接收机极易受到有意或无意的电磁干扰而导致无法正常工作,因此对接收机的抗干扰能力提出了要求。本文除了介绍几款用于北斗导航终端的天线外,研究并实现了自适应滤波抗干扰算法。本论文的主要工作可以概括如下：第一,根据指标要求,借鉴和总结前人的研究成果,设计了一款应用于北斗导航终端的新型结构的低剖面三频天线,并对天线的隔离性能分析,通过优化结构提高天线的隔离。接着,研究天线的小型化技术并对结构新型的天线进一步小型化,同时设计了一款小型化的北斗三频叠层天线。结果表明,这几款三频天线工作性能良好,具有一定的应用价值。第二,首先介绍了各种自适应准则和不同平面阵列以及共形阵的导向矢量,然后基于功率倒置算法分别实现了空域和空时二维联合的抗干扰仿真,空域给出了不同阵列的滤波性能,空时分析了阵元数、延迟单元数以及阵元间距对抗干扰性能的影响,通过Matlab仿真结果可以看出,空时二维联合抗干扰处理算法相对于纯空域滤波有着更好的抗干扰性能。第三,基于矩阵求逆需要处理的数据量很大,本文重点对多级维纳滤波降秩算法做了详细的理论分析与实现,接着对通道失配情况下的抗干扰性能作分析,并验证相关相减多级维纳滤波算法在DSP中的可行性。结果表明,该算法能够很好的在硬件平台上实现。
[Abstract]:The Global Satellite Navigation system (GNSS) is an extremely important space facility and is widely used in military and civilian fields. Beidou navigation system is a navigation system which is being independently developed and operated independently in our country. Considering the portability of Beidou navigation terminal equipment. The designed antenna should be as small as possible while satisfying the performance requirements. In addition, the receiver of Beidou navigation user is vulnerable to intentional or unintentional electromagnetic interference and can not work properly. Therefore, the anti-jamming capability of the receiver is required. In addition to the introduction of several antennas used in Beidou navigation terminal. The adaptive filter anti-jamming algorithm is studied and implemented. The main work of this paper can be summarized as follows: First, according to the requirements of the index, draw lessons from and summarize the previous research results, designed a new type of low profile three-frequency antenna used in Beidou navigation terminal, and analyzed the isolation performance of the antenna. The isolation of antenna is improved by optimizing the structure. Then, the miniaturization technology of antenna is studied and the new antenna is further miniaturized. At the same time, a miniaturized Beidou three-frequency laminated antenna is designed. These three-frequency antennas work well and have certain application value. Secondly, various adaptive criteria, different plane arrays and orientation vectors of conformal arrays are introduced, and then the anti-jamming simulation of space-time and space-time joint interference is implemented based on the power inversion algorithm. The filtering performance of different arrays is given in spatial domain. The effects of array element number, delay cell number and array cell spacing on anti-jamming performance are analyzed in space-time. The results of Matlab simulation show that. Space-time two-dimensional joint anti-jamming algorithm has better anti-jamming performance than pure spatial filtering. Third, based on the large amount of data needed to deal with matrix inversion, this paper focuses on the multi-level Wiener filter rank reduction algorithm to do a detailed theoretical analysis and implementation, and then the channel mismatch in the case of anti-jamming performance analysis. The feasibility of correlation subtractive multistage Wiener filter algorithm in DSP is verified. The results show that the algorithm can be implemented on hardware platform.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1

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