中国空间科学技术

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相干干扰对基于特征空间分解算法性能的影响

王永芳;谈展中;   

  1. 北京航空航天大学电子工程学院,北京航空航天大学电子工程学院 北京100083,北京100083
  • 发布日期:2007-02-25

Effect of the Correlated Interferences to the Eigen-space Decomposition Adaptive Algorithms

Wang Yongfang Tan Zhanzhong(School of Electronics and Information Engineering,Beijing University of Aeronautics & Astronautics,Beijing 100083)   

  • Online:2007-02-25
  • Supported by:
    GPS接收机自适应调零天线仿真研究基金项目(41324010104)

摘要: 分析干扰信号的互相关性和方向矢量正交性对接收信号自相关矩阵的特征值和特征向量分布的影响。干扰相关时,会有信号特征矢量发散到噪声空间,采用基于特征空间分解的自适应算法,只有在相干干扰的来向相同时才能实现干扰抑制,否则不能抑制此相干干扰;干扰不相关时,如果干扰来向相同,只能检测到一个干扰,但此时基于特征空间分解的自适应算法可实现干扰抑制。对MUSIC(multiple signal classification)和最小范数算法的仿真结果,与理论推导一致。

关键词: 自适应算法, 干扰抑制, 特征分析, 卫星信号

Abstract: When the interferences are correlated,the signal-eigenvector may shift to the noise space.At this situation,adopting the eigen-space decomposition adaptive algorithms,will not suppress the correlated interferences except the direction vectors of the interferences are same.When the uncorrelated interferences come from same direction,the eigen-space decomposition adaptive algorithms just detect one interference,but the algorithms will suppress the interferences.The simulation result of the MUSIC and Min-norm algorithms are same as the theory.