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首页> 外文期刊>Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of >ISAR Imaging of Maneuvering Target Based on the Quadratic Frequency Modulated Signal Model With Time-Varying Amplitude
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ISAR Imaging of Maneuvering Target Based on the Quadratic Frequency Modulated Signal Model With Time-Varying Amplitude

机译:基于时变幅度二次调频信号模型的机动目标ISAR成像

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摘要

Inverse synthetic aperture radar (ISAR) imaging of maneuvering target plays an important role in the field of national defense and surveillance. In this case, the conventional range Doppler algorithm is unsuitable to generate a well-focused ISAR image due to the time-varying property of the Doppler frequency during the integrated imaging interval. Furthermore, the dihedral or trihedral components of the imaging target or the phenomena of migration through resolution cell for the target's complex motion will induce the time-varying performance of the amplitude for the received signal. In this paper, the received signal in a range bin is depicted as multicomponent quadratic frequency-modulated signal with time-varying amplitude, and the generalized cubic phase function is used to estimate the parameters of it. Associated with the range instantaneous Doppler technique, the images quality can be enhanced distinctly compared with the conventional constant amplitude signal model. Results of simulated and read data demonstrate the effectiveness of the novel algorithm proposed in this paper.
机译:机动目标的逆合成孔径雷达(ISAR)成像在国防和监视领域起着重要作用。在这种情况下,由于在集成成像间隔期间多普勒频率的时变特性,传统的距离多普勒算法不适合生成聚焦良好的ISAR图像。此外,成像目标的二面或三面分量或通过目标的复杂运动通过分辨率单元的迁移现象将导致接收信号的振幅随时间变化。在本文中,测距箱中的接收信号被描述为幅度随时间变化的多分量二次调频信号,并使用广义三次相位函数来估计其参数。与传统的恒定幅度信号模型相比,与范围瞬时多普勒技术相结合,可以显着提高图像质量。仿真和读取数据的结果证明了本文提出的新算法的有效性。

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