| 利用压缩感知实现随机变频雷达散射中心估计 |
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| 引用本文： | 杨新锋,张金娜,滕书华,崔宇.利用压缩感知实现随机变频雷达散射中心估计[J].红外与激光工程,2016,45(5):526004-0526004(6). |
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| 作者姓名： | 杨新锋 张金娜 滕书华 崔宇 |
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| 作者单位： | 1.南阳理工学院 计算机与信息工程学院,河南 南阳 473000; |
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| 基金项目： | 国家自然科学基金(61471371);中国博士后科学基金(2012M512168);湖南省自然科学基金(2015jj3022);河南省科技攻关重点计划项目(122102210563,132102210215);河南省高等学校重点科研项目计划(15B520008) |
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| 摘 要： | 随机变频信号体制不仅可以降低系统瞬时带宽和数据采样率,还具有很强的抗干扰能力,然而,信号频率的随机变化导致现有目标散射中心估计方法失效。推导了随机变频信号的回波模型,在分析回波稀疏特性的基础上,提出了一种基于压缩感知的散射中心模型参数估计方法,将参数估计问题转化为压缩感知理论中的稀疏信号重构问题,并分析了感知矩阵对稀疏信号的重构性能。实验结果表明,所提方法能够在降低数据采样率的情况下对目标散射中心参数进行有效估计。
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| 关 键 词： | 雷达目标识别 压缩感知 散射中心 稀疏 |
| 收稿时间： | 2015-09-13 |
Parametric estimation of scattering center for random stepped frequency based on compressed sensing |
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| Affiliation: | 1.School of Computer and Information Engineering,Nanyang Institute of Technology,Nanyang 473000,China;2.Department of Information Technology,Zhengzhou Vocational College of Finance and Taxation,Zhengzhou 450000,China;3.Science and Technology on Automatic Target Recognition Laboratory,National University of Defense Technology,Changsha 410073,China;4.Department of 66393 PLA,Baoding 071000,China |
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| Abstract: | The random frequency signal format not only reduces the instantaneous band-width and data sampling rate, but also has the good characteristics of the radio-frequency immunity. However, the frequency of the signal changes randomly, which makes the traditional methods of scattering-center estimation invalid. Herein, the model of random frequency signal echoes was derived, and a novel parameter estimating method for scattering-center model was proposed based on the analysis of the radar echoes' sparse characteristic. The parameters estimation was converted to the problem of sparse signal reconstruction in the framework of Compressed Sensing(CS). The performance of the sensing matrix was investigated. Experiment results show that the presented method is effect even for low sampling-rate condition. |
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