| UWB-SAR相位域多普勒频率调制假目标欺骗干扰 |
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| 引用本文： | 和小冬,李昀豪,唐斌.UWB-SAR相位域多普勒频率调制假目标欺骗干扰[J].信号处理,2015,31(2):127-135. |
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| 作者姓名： | 和小冬 李昀豪 唐斌 |
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| 作者单位： | 电子科技大学电子工程学院 |
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| 基金项目： | 海装预研(4010104030401) |
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| 摘 要： | 本文从相位域假目标调制的角度提出了一种针对UWB-SAR信号去斜窄带接收，假目标多普勒频率相位模板调制，逆去斜宽带恢复的欺骗干扰实现方法。干扰机对截获的UWB-SAR信号下变频，利用LFM信号本振源对其去斜；利用方位向单元相位模板对窄带信号相位延时调整、相位调制，并对相位幅度转换后的干扰信号调制后向散射系数；将数模转换后的干扰信号逆去斜，使其恢复为带宽干扰信号，并对超宽带干扰信号上变频后转发。分析了参数侦测误差对假目标在SAR图像中的位置及其分辨率的影响。仿真结果表明，尽管参数侦测误差使假目标的位置偏移、分辨率降低，但由该方法产生的干扰信号仍能形成较为清晰的假目标图像，从而为UWB-SAR假目标欺骗干扰提供了一种可行性方法。
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| 关 键 词： | 多普勒频率 相位调制 超宽带 合成孔径雷达 欺骗干扰 参数误差 |
| 收稿时间： | 2014-05-22 |
False Target Deceptive Jamming for Countering UWB-SAR in Phase Domain Modulation of Doppler Frequency |
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| HE Xiao-dong;LI Yun-hao;TANG Bin.False Target Deceptive Jamming for Countering UWB-SAR in Phase Domain Modulation of Doppler Frequency[J].Signal Processing,2015,31(2):127-135. |
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| Authors: | HE Xiao-dong;LI Yun-hao;TANG Bin |
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| Affiliation: | School of Electronic and Engineering, University of Electronic Science and Technology of China |
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| Abstract: | A false target deceptive jamming method for countering UWB-SAR is proposed in this paper, which is based on dechirp processing to intercepted UWB-SAR signal , Doppler frequency modulation in phase domain and inverse dechirp to jamming signal. The jammer receiver quadrature downward converts and dechirps the intercepted UWB-SAR signal using an LFM oscillator, which could reduce the bandwidth and sample rate. And the jammer utilizes the Doppler frequency phase and backscattering coefficient template to modulate the intercepted narrowband signal. Then, the jammer uses LFM signal local oscillator to upward convert the jamming signal in order to recover the bandwidth of the jamming signal. The effects of parameter errors on the imaging position and resolution of false target in SAR image are also analyzed. Theoretical analysis and simulation indicated that the jamming signal proposed in this paper could produce a false target false. Even though the position of false target is offset and the resolution is reduce introduced by the reconnoitered parameters error, the jamming signal generated by the proposed method could still get a relatively clear image. Therefore, the proposed jamming signal generation method provides a feasible reference for countering UWB-SAR. |
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