【摘要】 临近空间高动态飞行器在高速飞行过程中与大气强烈作用，形成十分复杂的高温等离子鞘套，改变了目标的散射回波特性，给目标探测带来不确定性，需要及时判别当前目标是否处于等离子鞘套状态。本文提出一种基于波形熵判别和变带宽确认的等离子鞘套自动判别方法，首先提取目标回波波形熵、包络长度等特征信息，利用模糊分类器进行基于波形熵的群目标判别，其次根据鞘套与目标和目标之间的距离与信号带宽的关系差异，通过检测不同带宽回波的包络长度变化，对鞘套和目标进行判别。仿真结果验证了本文所提方法的有效性。更多还原

【Abstract】 The near space high-dynamic aircraft has a strong interaction with the atmosphere during high-speed flight, forming a particularly complex high temperature plasma sheath. Thus the scattering echo characteristic of the target will be changed, which may lead to the uncertainty of the target detection. It is necessary to determine in time whether the current target is in the state of plasma sheath. An automatic determination method for plasma sheath based on waveform entropy and variable bandwidth is proposed. Firstly, the feature information of target echo waveform entropy and envelope length is extracted. A fuzzy classifier based on waveform entropy is used to discriminate group targets. Secondly, the difference between the distance and signal bandwidth of the sheath and the target is used to detect the variation of the envelope length of the echo with different bandwidths. As a result, the sheath and the target are discriminated.The effectiveness of the proposed method is verified by simulation results.更多还原