| 基于时频分布的电子侦察信道参数估计方法 |
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| 引用本文： | 江莉,董惠,李林,刘利.基于时频分布的电子侦察信道参数估计方法[J].航天电子对抗,2010,26(4):26-29. |
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| 作者姓名： | 江莉 董惠 李林 刘利 |
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| 作者单位： | 1. 西安建筑科技大学信息与控制工程学院,陕西,西安,710055
2. 西安电子科技大学电子工程学院,陕西西安,710071 |
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| 摘 要： | 提出了一种基于时频分布的信道参数盲估计方法。首先分析了多径信道模型和时频域匹配滤波算法，接着根据时频分布自身项和交叉项的不同特点，提出采用短时傅里叶变换的时频图对Wigner—Ville分布进行滤波，以提取源信号的时频脊线，然后利用时频域匹配滤波对多径信号进行参数估计。该方法快速简单，参数估计准确，分辨率高。仿真实验对雷达脉内频率调制信号进行多径参数估计，实验结果证明了该方法的正确性和有效性。
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| 关 键 词： | 时频分布 多径信道 参数估计 瞬时频率 |
Channel estimation method for electronic reconnaissance based on time-frequency distribution |
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| Jiang Li,Dong Hui,Li Lin,Liu li.Channel estimation method for electronic reconnaissance based on time-frequency distribution[J].Aerospace Electronic Warfare,2010,26(4):26-29. |
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| Authors: | Jiang Li Dong Hui Li Lin Liu li |
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| Institution: | 1. School of Information and Control Engineering, Xi＇an Univ. of Arch. and Tech. ,Xi＇an 710055,Shanxi,China2. School of Electronic Engineering, Xidian University, Xi＇ an 710071,Shanxi,China) |
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| Abstract: | A channel parameter estimation method based on time-frequency distribution is proposed. First, multipath channel mode and match filtering in time-frequency domain are analyzed. Then according to the prop- erties of self and cross terms,the short time Fourier transform is used for filtering the Wigner-Ville distribution to extracting the time-frequency ridge of the source signal. This method is simple in calculation, accurate in pa- rameter estimation and high in resolution. Finally,Simulation experiments on radar intra-pulse linear frequency modulation signals and quartic frequency modulation signals verify the correctness and efficiency of the pro- posed method. |
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| Keywords: | time-frequency distribution multipath channel ~ parameter estimation~ instantaneous frequency |
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