高超声速目标雷达回波脉内运动模型

针对线性调频脉冲压缩雷达体制下高超声速目标回波信号建模问题，采用目前常用的停走模型，由于忽略了目标在一个脉冲持续时间内（简称脉内）的运动，不能真实反映目标回波特点，高超声速目标回波信号的脉冲压缩输出存在较严重的主瓣偏移并展宽的问题，严重影响目标信号的积累与检测。对此，提出了高超声速目标回波信号的脉内运动模型，理论分析和数值仿真均表明了高超声速目标的回波信号采用脉内运动模型的必要性。在典型参数下，采用脉内运动模型比采用停走模型的脉冲压缩增益提高3 dB以上。

IPM model for radar echo signal of hypersonic targets

That stop and go (SAG) model of echo signal currently used in linear frequency modulation (LFM) pulse compression radar is inaccurate to hypersonic targets for overlooking the range variation within single pulse duration, which will cause the offset and broadening of mainlobe and increase sidelobe. A more realistic echo model-inner pulse motion (IPM) is presented. A comparison of pulse compression performance under the two models is made by theoretical analysis and experiment results.We found that the pulse compression gain has an increase of 3dB by using the IPM model compared to the SAG model.