Analysis of Sliding Spotlight SAR Interferometry
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摘要: 合成孔径雷达聚焦成像时,因地球旋转和传感器姿态控制误差而产生的非零多普勒中心在聚焦影像方位线中引入了线性相位,因此在干涉处理时方位线不能作为基带信号进行重采样。为了确保相位信息在重采样过程中不出现损失,一般采用内插核调制的方法完成方位线重采样。滑动聚束模式影像因成像的特殊性,聚焦影像的多普勒中心分布更加复杂,其方位线为时变信号。分析了滑动聚束模式影像点目标的多普勒历程,多普勒中心在方位线的变化规律,时变信号的内插方法,并通过模拟实验验证非零多普勒中心对内插精度的影响,最后对DORIS软件重采样环节进行改进,即采用新的多普勒中心表达式对内插核进行调制完成影像重采样,实现TerraSAR-X卫星滑动聚束模式影像的干涉处理。Abstract: When SAR raw data is being focused, a linear phase term was introduced in azimuth lines of focused image, due to the nonzero Doppler centroid generated by the earth rotation and the SAR sensor positioning disturbances. Therefore, we can not resample the azimuth lines as baseband signal during interferometric processing. Generally, in order to keep the integrity of the phase information, a azimuth interpolation kernel spectrum is shifted to Doppler centroid. Because of the specialty of sliding spotlight imaging mode, the Doppler centroid is distributed more complex, and azimuth lines become time-varying signal. In this paper, the Doppler change history and the change rule of Doppler centroid of azimuth lines based on sliding spotlight mode imaging theory, and time-varying signal interpolation method is analyzed. Also, the interpolation accuracy affected by nonzero Doppler centroid is discussed based on simulation experiment. Then, an improvement in resample process chain of Delft-DORRIS is introduced, which is implemented by shifting interpolation kernel in azimuth according to the new Doppler centroid equation. Finally an imagine focus processing of sliding spotlight mode image from TerraSAR-X satellite is produced by the new resample process chain.
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Keywords:
- SAR /
- sliding spotlight mode /
- interpolation kernel /
- time-frequency analysis /
- Doppler-centroid
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