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111. 发明授权

US5343204A Auto-focusing correction for rotational acceleration effects on inverse synthetic aperture radar images 失效
标题翻译：反向合成孔径雷达图像的旋转加速度自动对焦校正
公开(公告)号：US5343204A
公开(公告)日：1994-08-30
申请号：US98917
申请日：1993-07-29
申请人： Michael E. Farmer , John D. Hatlestad
发明人： Michael E. Farmer , John D. Hatlestad
IPC分类号： G01S13/90
CPC分类号： G01S13/9035
摘要： Inverse synthetic aperture radar imaging systems that are used to image targets that undergo rotational accelerations are enhanced by signal processing techniques which provide correction factors to reduce the frequency-shift and frequency-stretch errors that occur due to such accelerations. A target scan is subdivided into a number of sub-apertures and a Fast Fourier Transfer (FFT) is performed on the data for each sub-aperture to provide associated frequency sub-images. The FFT is then subdivided in "sub-swaths" of amplitude versus frequency for a plurality of frequency bands. The change-of-frequency, or frequency shift, data between prominent scattering points of each sub-image are processed to provide a phase correction factor that incorporates range changes and translational acceleration distortions for additional scattering points other than the most prominent scattering point. A frequency-stretch correction factor that compensates for rotational acceleration distortion is also provided.
摘要翻译：用于对经历旋转加速度的目标进行成像的反合成孔径雷达成像系统通过信号处理技术得到增强，该技术提供校正因子以减少由于这种加速度而发生的频移和频率拉伸误差。目标扫描被细分为多个子孔径，并且对每个子孔径的数据执行快速傅立叶转换（FFT）以提供相关联的频率子图像。然后将FFT分解成多个频带的幅度对频率的“子条带”。处理每个子图像的突出散射点之间的频率变化或频率偏移数据以提供相位校正因子，其包括除最突出的散射点之外的附加散射点的范围变化和平移加速度失真。还提供了补偿旋转加速度失真的频率拉伸校正因子。

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