The high velocity of the re-entry object causes its surface to be enveloped with a plasma sheath. In the process of target detection of re-entry objects, the plasma sheath with fluid characteristics results in multiple reflected signals in the radar echo. Multiple targets appear in the 1-D range profile following pulse compression processing of a multicomponent echo signal. We refer to targets different from the real target as interference targets. The appearance of interference targets seriously affects the radar detection of re-entry objects, resulting in positioning failure or even tracking loss. In this article, by establishing the physical model of radar echo with multiple reference points and multiple velocity parameters of the re-entry object under plasma sheath, the multitarget phenomenon of the re-entry target echo signal on the 1-D range profile is simulated. A target detection method based on Doppler frequency compensation and nonuniform plasma sheath reflection model is proposed, which can effectively suppress false targets and realize reliable detection of targets under plasma sheath. The feasibility of detecting a target enveloped by a plasma sheath is verified by simulation, laying the foundation for the precise detection and tracking of targets.

中文翻译：

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基于多普勒频率补偿的等离子鞘包裹目标检测方法

再入物体的高速使其表面被等离子体鞘包裹。在再入物体的目标检测过程中，具有流体特性的等离子体鞘层会导致雷达回波中出现多次反射信号。在对多分量回波信号进行脉冲压缩处理之后，多个目标出现在 1-D 距离剖面中。我们将与真实目标不同的目标称为干扰目标。干扰目标的出现严重影响了再入目标的雷达探测，导致定位失败甚至跟踪丢失。本文通过建立等离子体鞘下再入物体多参考点和多速度参数的雷达回波物理模型，模拟了再入目标回波信号在一维距离剖面上的多目标现象。提出了一种基于多普勒频率补偿和非均匀等离子体鞘层反射模型的目标检测方法，能够有效抑制假目标，实现等离子体鞘层下目标的可靠检测。通过仿真验证了检测被等离子体鞘包裹的目标的可行性，为目标的精确检测和跟踪奠定了基础。