| 基于特征分解的多模杂波抑制方法 |
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| 引用本文： | 蔚娜,李雪,李铁成.基于特征分解的多模杂波抑制方法[J].电波科学学报,2016,31(1):85-90. |
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| 作者姓名： | 蔚娜 李雪 李铁成 |
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| 作者单位： | 中国电波传播研究所, 青岛 266107 |
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| 基金项目： | 国家自然科学基金青年基金(61302006)，中国电科技术创新基金(JJ-QN-2013-28) |
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| 摘 要： | 电离层对天波超视距雷达回波信号的污染严重制约了雷达对慢速目标的检测, 相位扰动与多模传播共存时, 更是加重了回波杂波谱的展宽.针对这一情况, 文中提出了基于特征分解的多模杂波抑制方法, 根据不同群距离单元上回波信号的相关性来选择群距离单元构造协方差矩阵, 通过一个模板滤波器对回波信号滑动滤波来确定回波信号模式个数, 从而可通过对协方差矩阵的特征分解来确定目标信号和噪声子空间, 继而完成杂波的抑制.该方法实现简单, 适合工程应用, 并且对实测数据的处理结果证实了该方法的有效性.
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| 关 键 词： | 天波超视距雷达 相位扰动 多模 杂波抑制 |
| 收稿时间： | 2015-02-13 |
An eigenvalue decomposition based method for suppressing multi-mode clutter |
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| Affiliation: | China Research Institute of Radiowave Propagation, Qingdao 266107, China |
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| Abstract: | The detection of slow-moving target is seriously hampered by ionospheric contamination in the over-the-horizon radar(OTHR). The clutter spectrum is broadened worse when the phase disturbance and multi-mode propagation coexist. In this paper, a method for suppressing multi-mode clutter based on eigenvalue decomposition is presented to solve the problem mentioned above. The echo signals of some group-distance cells selected in according to the correlation among different cells are used to construct the covariance matrix, and the mode number of echo signal is obtained through sliding filtering using a template filter. After that, the target signal and noise subspace is determined, and then, the multi-mode clutter is suppressed. The method is easy to implement, thus suitable for engineering applications. The processing resuleness of the measured data show the effectiveness of the proposed method. |
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| Keywords: | over-the-horizon radar phase disturbance multi-mode clutter suppressing |
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