More, based on the assumption that image cancroids is changeless, we resolve the image azimuth shift problem caused by linear phase errors.

并利用图像质心不变的假设，解决了线性相位引起的图像方位位置偏移问题。

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By using ERS-1/2 data, spectrum-shift filtering scheme in both range and azimuth directions is implemented.

针对ERS-1/2数据， 设计并实现了距离和方位向上的谱移滤波；

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