基于干扰重构和峭度最大化的SMSP干扰抑制方法

李欣; 王春阳; 原慧; 金珊珊

doi:10.13700/j.bh.1001-5965.2017.0421

基于干扰重构和峭度最大化的SMSP干扰抑制方法

doi: 10.13700/j.bh.1001-5965.2017.0421

李欣¹,
王春阳^1, ,,
原慧¹,
金珊珊²

1.
空军工程大学防空反导学院, 西安 710051
2.
中国人民解放军 95169部队, 南宁 530031

基金项目:

国家自然科学基金 61601502

国家自然科学基金 61501500

航空科学基金 20150196007

详细信息

作者简介:
李欣  男, 博士研究生。主要研究方向:雷达抗干扰技术、雷达信号处理技术

王春阳  男, 博士, 教授, 博士生导师。主要研究方向:综合电子战理论与技术

原慧  女, 博士研究生。主要研究方向:雷达抗干扰技术、单通道盲信号分离技术

金珊珊  女, 硕士, 助理工程师。主要研究方向:雷达抗干扰技术

通讯作者:
王春阳, E-mail:Wcy_kgd_cn@163.com

中图分类号: TN974
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出版历程
- 收稿日期: 2017-06-21
- 录用日期: 2017-09-15
- 网络出版日期: 2018-06-20

SMSP jamming suppression method based on jamming reconstruction and kurtosis maximum

1.
Air and Missile Defence College, Air Force Engineering University, Xi'an 710051, China
2.
Unit 95169 of the People's Liberation Army of China, Nanning 530031, China

Funds:

National Natural Science Foundation of China 61601502

National Natural Science Foundation of China 61501500

Aeronautical Science Foundation of China 20150196007

More Information

Corresponding author: WANG Chunyang, E-mail:Wcy_kgd_cn@163.com

摘要

摘要:
频谱弥散（SMSP）干扰是一种针对线性调频（LFM）信号的相参压制干扰。根据SMSP干扰子脉冲的周期特性，提出了一种基于干扰重构和峭度最大化的干扰抑制方法。首先，利用自相关方法估计干扰子脉冲的周期，并根据干扰的产生原理确定子脉冲调频斜率，即可重构相位未知的干扰子脉冲；其次，对重构的干扰子脉冲分别设定不同的相位，并与接收信号做共轭相乘，根据相乘的结果确定干扰信号的初相位；最后，利用峭度最大化原理，确定干扰抑制因子，实现干扰抑制。仿真结果表明，本文方法能够有效实现干扰抑制，经过干扰抑制后的信干比可达20 dB以上，并且在存在噪声和相位误差的情况下，仍能够保持较高的信干噪比增益。
- 频谱弥散(SMSP)干扰 /
- 干扰重构 /
- 自相关方法 /
- 峭度最大化 /
- 脉冲压缩
Abstract:
Smeared spectrum (SMSP) jamming is a kind of correlative blanket jamming to linear frequency modulation (LFM) signals. According to the periodicity of SMSP jamming sub-pulse, a jamming suppression method based on jamming reconstruction and kurtosis maximum is proposed. Firstly, the period of sub-pulse is estimated by utilizing the autocorrelation method, and the frequency modulation rate is computed based on the principle of SMSP jamming. Then we can reconstruct each jamming sub-pulse while the phase is still unknown. Secondly, each reconstructed sub-pulse is set with different phase, and then the conjugate multiplication between received signal and reconstructed signal is done. The initial phase of jamming signal can be achieved by analyzing the result of conjugate multiplication. Finally, the jamming suppression factor is computed based on the kurtosis maximum and then the jamming can be suppressed. The simulation results show that the proposed method can suppress SMSP jamming efficiently, the SIR can be more than 20 dB after jamming suppression, and it can maintain high signal-to-interference and noise ratio gain even when the noise and phase error exist.
- smeared spectrum (SMSP) jamming /
- jamming reconstruction /
- autocorrelation method /
- kurtosis maximum /
- pulse compression

HTML全文

图 1 SMSP干扰的产生原理^[3]

Figure 1. Emerging principle of SMSP jamming^[3]

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图 2 雷达信号和SMSP干扰信号波形

Figure 2. Waveform of radar signal and SMSP jamming signal

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图 3 接收信号时频分析和脉冲压缩结果

Figure 3. Time-frequency analysis of received signal and pulse compression results

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图 4 接收信号的自相关函数

Figure 4. Autocorrelation function of received signal

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图 5 重构信号与接收信号共轭相乘结果

Figure 5. Conjugate multiplication results between reconstructed signal and received signal

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图 6 峭度变化规律

Figure 6. Variation curve of kurtosis

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图 7 干扰抑制结果

Figure 7. Jamming suppression results

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图 8 干扰抑制前后的检测门限(SNR=0 dB)

Figure 8. Detection threshold before and after jamming suppression (SNR=0 dB)

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图 9 信干噪比增益变化曲线

Figure 9. Variation curves of signal-to-interference and noise ratio gain

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