卫星干扰源定位及干扰抑制技术研究

发布时间：2018-01-16 22:03

本文关键词：卫星干扰源定位及干扰抑制技术研究　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：为解决卫星通信中的干扰问题,应充分利用时域、频域或空域的抗干扰技术。相对于时频域来说,空域抗干扰已成为干扰抑制的一个重要措施。为了消除恶意的或无意的射频干扰信号,将干扰源定位技术与卫星自适应阵列波束形成技术有效地结合起来,将可以实现高性能的空域滤波。实现空域滤波的一个关键问题是:如何快速地定位估计,得到多个干扰源方向后再进行调零。在此背景下,本文针对卫星干扰源定位及干扰抑制技术从两个方面展开研究:一是对来自地面的干扰源的定位估计;二是在对干扰源定位的基础上,利用自适应阵列数字波束形成(ADBF)技术来抑制或消除干扰。卫星干扰源定位技术的一个新思路就是利用卫星天线所具有的多波束覆盖特性,实现单颗卫星对干扰源的高精度高分辨率定位。在卫星阵列天线所接收的信号基础上,采用空间谱估计技术对其进行处理,得到干扰源的波达方向(DOA),然后再根据星历信息,可获得准确的地面干扰源的位置信息。利用卫星多波束天线覆盖特性实现干扰源定位的思路,在实现定位的同时,也为卫星自适应天线阵列的调零技术奠定了基础。本文针对基于窄带相干源信号模型的来波方向估计算法进行研究,提出了两种具有解相干能力的二维MUSIC改进算法和二维ESPRIT改进算法,并仿真分析了所提出算法对于相干信号的二维DOA估计性能。针对宽带相干源信号模型的来波方向估计算法进行研究,提出了一种基于角频分离实现宽带聚焦的相干二维DOA估计算法,可应用到任意几何平面的阵列结构上。在DOA估计的基础上,采用自适应数字波束形成算法来抑制干扰。提出了一种修正的基于特征空间的多波束约束最小方差算法,该算法的输出SINR较高,且在收敛速度快和低快拍下也有较好的性能,具有较强的稳健性。
[Abstract]:In order to solve the interference problem in satellite communication, we should make full use of the anti-jamming technology in time domain, frequency domain or spatial domain, compared with time-frequency domain. In order to eliminate the malicious or unintentional radio frequency interference signal, the interference source location technology and the satellite adaptive array beamforming technology are effectively combined in order to eliminate the malicious or unintentional radio frequency interference signal. A key problem in the realization of spatial filtering is how to quickly locate and estimate multiple interference sources and then zero them. In this paper, the satellite interference source location and interference suppression technology are studied from two aspects: first, the location estimation of the interference source from the ground; The second is based on the location of the interference source. Adaptive array digital beamforming (ADBF) technique is used to suppress or eliminate interference. A new idea of satellite interference source localization is to utilize the multi-beam coverage characteristic of satellite antenna. On the basis of the signal received by the satellite array antenna, spatial spectrum estimation technique is used to process the interference source, and the DOA of the interference source is obtained. Then according to the ephemeris information, the accurate location information of the ground interference source can be obtained. The idea of realizing the location of the interference source by using the coverage characteristic of the satellite multi-beam antenna can be realized at the same time. It also lays a foundation for the zeroing technology of satellite adaptive antenna array. In this paper, the direction estimation algorithm based on narrowband coherent source signal model is studied. Two improved two-dimensional MUSIC algorithms and two dimensional ESPRIT improved algorithms with decoherence ability are proposed. The performance of the proposed algorithm for two-dimensional DOA estimation of coherent signals is analyzed by simulation, and the direction estimation algorithm for wideband coherent source signal model is studied. A coherent two-dimensional DOA estimation algorithm based on angular frequency separation for wideband focusing is proposed, which can be applied to the array structure of arbitrary geometric plane. Based on the DOA estimation, a coherent two-dimensional DOA estimation algorithm is proposed. Adaptive digital beamforming algorithm is used to suppress interference. A modified multi-beam constrained minimum variance algorithm based on feature space is proposed. The output SINR of the algorithm is high. It also has good performance and strong robustness under the condition of fast convergence and low fast shooting.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

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