| 摘要: |
| 针对常规的时域对消法在抑制主瓣恒模干扰信号时，脉压峰值损失6 dB且目标位置处仍有残余干扰的问题，提出了一种改进的时域对消处理方法。本文首先通过推导对消后剩余信号的具体表达式，接着给出一种时变匹配滤波器形式，提出了基于时变滤波处理的脉压信噪比补偿算法。然后为了提取被对消后残余干扰淹没的小目标，给出了一种在主目标位置处再次对消残余干扰的干扰抑制方法，使得小目标能够被检测。最后给出了改进时域对消算法流程。计算机仿真说明了该方法的有效性。 |
| 关键词: 主瓣干扰 时域对消 时变匹配滤波 干扰抑制 小目标提取 |
| DOI：DOI:10.3969/j.issn.1672-2337.2020.05.003 |
| 分类号:TN974 |
| 基金项目:航空科学基金项目（No.2017052015，20182007001） |
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| Modified Time-Domain Cancellation Algorithm for Constant-Modulus Jamming Suppression |
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XU Naiqing， ZHANG Jindong， WEI Yuning
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College of Electronic and Information Engineering，Nanjing University of Aeronautics and Astronautics， Nanjing 210016， China
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| Abstract: |
| When traditional time-domain cancellation algorithm is used to suppress constant modulus mainlobe interference, there will be a 6 dB peak loss after pulse compression and residual interference remaining in the signal after cancellation. Aiming at this problem, a modified time-domain cancellation algorithm is thus proposed. In this paper, a form of time-varying matched filter is given by first deriving the specific expression of the residual signal after cancellation. Therefore, an SNR compensation algorithm is proposed on the base of time-varying filtering. Then, in order to detect and extract the small target submerged by the residual interference, a method of suppressing residual interference at the target position is given. Finally, the process of the modified time-domain cancellation algorithm is given. Computer simulation results show the effectiveness of the method. |
| Key words: mainlobe interference time-domain cancellation algorithm time-varying matched filter interference suppression small target extraction |
