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等离子鞘套包覆目标长时间能量聚焦方法(2022增刊2)

张廷焜1,李铮2,温旭东3,洪逸清1,白博文1   

  1. 1. 西安电子科技大学
    2. 中国运载火箭技术研究院 空间物理实验室
    3. 中国人民解放军63610部队
  • 收稿日期:2022-06-30 修回日期:2022-09-26 出版日期:2022-09-30 发布日期:2022-09-30
  • 通讯作者: 张廷焜
  • 基金资助:
    国家自然科学基金;陕西省自然科学基础研究计划

A long-term energy focusing method for plasma-sheath-covered targets

  • Received:2022-06-30 Revised:2022-09-26 Online:2022-09-30 Published:2022-09-30
  • Contact: 廷焜 张
  • Supported by:
    National Natural Science Foundation of China;Natural Science Basic Research Plan in Shanxi Province of China

摘要: 当再入物体以高超声速飞行时,其表面被等离子鞘套覆盖。等离子鞘套对雷达回波产生幅度、相位和频率调制,严重影响了雷达对再入目标的可靠探测能力,导致多种雷达探测异常问题。本文通过建立等离子鞘套包覆目标的雷达回波模型,分析了等离子鞘套对雷达回波产生的影响。提出了一种基于慢时间自相关的脉冲内多普勒频率对消方法,可以有效的解决非均匀等离子鞘套所引起的雷达回波中脉内多-多普勒频率现象,并运用变尺度的傅里叶变换及逆傅里叶变换对相关后信号中的耦合项进行解耦,进而实现信号的能量聚焦。通过对多周期回波信号进行仿真分析,验证了了本文所提算法的有效性,并结合统计实验分析验证了算法的可靠性,为等离子鞘套包覆目标的相参积累提供了一种有效方法。

关键词: 等离子鞘套, 雷达回波, 脉冲内多普勒频率, 慢时间自相关, 能量聚焦

Abstract: As the reentry object travels at hypersonic speeds, its surface is covered by a plasma sheath. The plasma sheath modulates the radar echo in amplitude, phase, and frequency, which seriously affects the reliable detection capability of the radar for reentry targets, resulting in various abnormal radar detection problems. In this paper, the influence of the plasma sheath on the radar echo is analyzed by establishing the radar echo model of the target covered by the plasma sheath. An intra-pulse Doppler frequency cancellation method based on slow time autocorrelation is proposed, which can effectively solve the multi-Doppler frequency phenomenon in the radar echo caused by the non-uniform plasma sheath. The leaf transform and the inverse Fourier transform decouple the coupling terms in the correlated signal, thereby realizing the energy focusing of the signal. The validity of the algorithm proposed in this paper is verified by the simulation analysis of the multi-period echo signal, and the reliability of the algorithm is verified by combining the experimental statistical analysis, which provides an effective method for the coherent accumulation of the plasma sheath coated target method.

Key words: Plasma sheath, Radar echo, intra-pulse Doppler frequency, slow time autocorrelation, energy focus

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