| 基于线性时频分析的非平稳源空间谱估计 |
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| 引用本文： | 周浩,文必洋,吴世才,马志刚. 基于线性时频分析的非平稳源空间谱估计[J]. 信号处理, 2004, 20(6): 605-608 |
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| 作者姓名： | 周浩 文必洋 吴世才 马志刚 |
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| 作者单位： | 武汉大学电子信息学院,武汉,430079 |
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| 基金项目： | 国家"十五"863计划资助项目(2001AA631050) |
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| 摘 要： | 针对存在幅度和相位调制的非平稳信号的定向问题,本文提出了一种改进的线性时频空间谱估计算法。该算法首先在线性时频面上检测信号的时频脊,并沿各时频脊进行采样形成独立的阵列时频快拍,然后对各快拍采用通用算法进行空间谱估计,此时阵列能估计的信号源数已不再受阵元数的限制。计算机仿真实验表明,该算法具有优良的定向精度,且能有效地对多个非平稳信号源进行分离和空间谱估计,其计算量远低于二次时频空间谱估计算法。
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| 关 键 词： | 空间谱估计 时频分析 信号源分离 瞬时频率 |
| 修稿时间： | 2003-10-20 |
Spatial Spectral Estimation of Nonstationary Sources Based on Linear Time-Frequency Analysis |
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| Zhou Hao Wen Biyang Wu Shicai Ma Zhigang. Spatial Spectral Estimation of Nonstationary Sources Based on Linear Time-Frequency Analysis[J]. Signal Processing(China), 2004, 20(6): 605-608 |
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| Authors: | Zhou Hao Wen Biyang Wu Shicai Ma Zhigang |
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| Abstract: | An improved linear time-frequency spatial spectral estimation algorithm is proposed to deal with multiple nonstationary signal sources with amplitude and phase modulation. Firstly signal ridges on the linear time-frequency representation (TFR) are detected and samples are taken along each ridge to form separate array TF snapshots, then common spatial spectral estimation algorithms are applied on each snapshot to give separate directions of arrival (DOA) estimations, with the total number of the array accommodable sources going beyond the limit of the number of the array elements. Computer simulations show the improved performance of the proposed algorithm on separation and direction finding of multiple nonstationary sources. |
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| Keywords: | spatial spectral estimation time-frequency analysis source separation instantaneous frequency |
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