This paper describes a digital processing method applicable to a synthetic aperture radar, to be carried by the space shuttle or by satellites. The method uses an earth-fixed coordinate system in which corrective procedures are invoked to compensate for errors introduced by the satellite motion, earth curvature, and wavefront curvature. Among the compensations discussed are those of the coordinate system, skewness, roll, pitch, yaw, earth rotation, and others. The application of a Fast Fourier

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... ransform in the numerical processing of the two-dimensional convolution is discussed in detail. SYNTHETIC APER TURE R SEPTEMBER 1977 Maximum Physical possible synthctic Lineof flight Q 2 antenna length = M Q, size = I2m antenna Ground P Y Y \ J 2 r "8km