| 基于时频表示的跳频信号分析 |
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| 引用本文： | 刘荣科,张晓林. 基于时频表示的跳频信号分析[J]. 航空学报, 2001, 22(Z1): 57-60 |
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| 作者姓名： | 刘荣科 张晓林 |
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| 作者单位： | 北京航空航天大学电子工程系 北京 100083 |
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| 摘 要： | 针对跳频信号的非平稳性,提出了基于时频表示的跳频信号分析方法。该方法能够有效地描绘出跳频信号的频率随时间跳变的规律 (跳频图案 ),具有很高的时间 -频率分辨率,同时能够有效抑制或减小交叉项的干扰,计算时可采用递归算法,运算量较小,因此能够满足跳频系统的快速分析、跟踪、测量等要求。计算机仿真验证了应用时频表示法分析跳频信号的有效性和实用性。
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| 关 键 词： | 跳频信号 通信对抗 时频分析 谱图 Winger-Ville分布 短时傅立叶变换 |
| 文章编号： | 1000-6893(2001)0-057-04 |
| 收稿时间： | 2000-05-10 |
| 修稿时间： | 2000-05-10 |
FREQUENCY-HOPPED SEQUENCE ANALYSIS BASED ON TIME-FREQUENCY PRESENTATION |
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| LIU Rong-ke,ZHANG Xiao-lin. FREQUENCY-HOPPED SEQUENCE ANALYSIS BASED ON TIME-FREQUENCY PRESENTATION[J]. Acta Aeronautica et Astronautica Sinica, 2001, 22(Z1): 57-60 |
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| Authors: | LIU Rong-ke ZHANG Xiao-lin |
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| Affiliation: | Dept. of Electronic Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | A new analysis of frequency hopped sequence based on time frequency presentation is proposed in the paper. The analysis method could plot the time frequency relation efficiently. It has higher resolution on the time frequency domain than short time Fourier transformation (STFT) or spectrogram(SG), and could reduce or completely remove the cross terms. The computation could take the recursive algorithm with lower computation complexity, so it could qualify for the frequency hopped communication system's analysis, track and measure. The computer simulations are presented demonstrating the capabilities of the analysis method based on time frequency presentation. |
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| Keywords: | fr equency hop sequence communication countermeasur es time -frequency analysis spectrogram Winger-Ville distribution short -time Four ier transformation |
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