| 基于RSPWVD-Hough的多分量LFM信号检测 |
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| 引用本文： | 梁红,胡旭娟,朱云周.基于RSPWVD-Hough的多分量LFM信号检测[J].系统仿真学报,2007,19(13):3030-3032,3037. |
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| 作者姓名： | 梁红 胡旭娟 朱云周 |
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| 作者单位： | 1. 西北工业大学,航海学院,陕西,西安,710072
2. 中国船舶重工集团公司第705研究所,陕西,西安,710075 |
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| 基金项目： | 船舶工业国防科技基础研究基金 |
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| 摘 要： | 由于多分量LFM信号的双线性时频分布（BTFD）存在交叉项的干扰，所以在低信噪比条件下直接在时频平面难于进行检测，采用重排平滑伪魏格纳维尔分布（RSPWVD），能在抑制交叉项的同时提高时频聚集性，并利用Hough变换检测图像中直线的原理，将多分量LFM信号的检测问题转换为在参数空间寻找局部极大值的问题，由于Hough变换运算量较大，提出一种在平滑重排后进行设定门限处理的方法，仿真实验表明，该方法可以在抑制噪声和交叉项的同时大大减少运算量。
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| 关 键 词： | 魏格纳-维尔分布 平滑 重排 Hough变换 门限 |
| 文章编号： | 1004-731X（2007）13-3030-03 |
| 收稿时间： | 2006-05-26 |
| 修稿时间： | 2006-05-262007-04-28 |
Multi-component LFM Signal Detection Based on Reassign-Smooth-Pseudo-Wigner-Ville Distribution |
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| LIANG Hong,HU Xu-juan,ZHU Yun-zhou.Multi-component LFM Signal Detection Based on Reassign-Smooth-Pseudo-Wigner-Ville Distribution[J].Journal of System Simulation,2007,19(13):3030-3032,3037. |
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| Authors: | LIANG Hong HU Xu-juan ZHU Yun-zhou |
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| Abstract: | Because of the presence of cross-term interference in bilinear time-frequency distribution (BTFD) of multi-component chirp signal, it is difficult to detect the chirp components in a time-frequency plane in low SNR. Using reassign-smoothed-pseudo-wigner-ville(RSPWV) can restrain cross-term and enhance time-frequency concentration, and change the detection problem in multi-component chirp signal to searching local max in parameter space through Hough Transform. The threshold was set after RSPWVD to reduce calculation of Hough Transform. Simulation results show that the method can suppress noise and cross-term interference, and shorten calculation time. |
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| Keywords: | wigner-ville distribution smooth reassign Hough Transform threshold |
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