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Spotlight SAR data processing using the frequency scaling algorithm

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3 Author(s)
Mittermayer, J. ; Inst. fur Hochfrequenztech., Deutsches Zentrum fur Luft- und Raumfahrt, Oberpfaffenhofen, Germany ; Moreira, A. ; Loffeld, O.

This paper presents a new processing algorithm for spotlight SAR data processing. The algorithm performs the range cell migration correction for non-chirped raw data without interpolation by using a novel frequency scaling operation. The azimuth processing is based on a spectral analysis approach which is made highly accurate by azimuth scaling. In almost all processing stages, a subaperture approach is introduced for efficient azimuth processing. In this paper, the complete derivation of the algorithm is presented. A very useful formulation for non-chirped SAR signals in the range Doppler domain is also proposed where the residual video phase is expressed by a chirp convolution. The algorithm performance is shown by several simulations. A spotlight image, which has been extracted from stripmap raw data of the experimental SAR system of DLR, shows the validity of the frequency scaling algorithm

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Geoscience and Remote Sensing, IEEE Transactions on  (Volume:37 ,  Issue: 5 )