Abstract
TOPS (terrain observation by progressive scans) is a recently proposed SAR mode for wide swath acquisition, which aims at achieving the same coverage and resolution as the SCAN mode besides creating scalloping-free images. In this paper, a general SAR imaging model used in TOPS and other SAR modes is introduced, where the antenna sweep rate, Doppler centroid rate, illumination time and azimuth resolution are described by a parameter defined as the “mode factor”. After analyzing the characteristics of TOPS signal, an algorithm based on chirp-z transform is proposed, in which a new de-rotation function is used. Simulation results validate the proposed algorithm.
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Moore R K, Claassen J P, Lin Y H. Scannning spaceborne synthetic apreture radar with integrated radiometer. IEEE Trans Aerospo Electron Syst, 1981, AES-17: 410–420
Guarnieri A M, Prati C. ScanSAR focusing and interferometry. IEEE Trans Geosci Remote Sens, 1996, 34: 1029–1038
Zan F D, Guarnieri A M. TOPSAR: terrain observation by progressive scans. IEEE Trans Geosci Remote Sens, 2006, 44: 2352–2360
Meta A, Prats P, Steinbrecher U, et al. TerraSAR-X TOPSAR and ScanSAR comparison. In: Proc. EUSAR08, Friedrichshafen, Germany, VDE, 2008. 277–278
Stangl M, Werninghaus R, Schweizer B, et al. TerraSAR-X technologies and first results. IEE Proc Radar Sonar Navig, 2006, 153: 86–95
Breit H, Balss U, Bamler R, et al. Processing of TerraSAR-X payload data-first results. In: Notarnicola C, Posa F, eds. Proc. of SPIE vol. 6746-SAR Image Analysis, Modeling, and Techniques IX, Florence, Italy. SPIE, 2007. 1–12
Prats P, Scheiber R, Mittermayer J, et al. A SAR processing algorithm for TOPS imaging mode based on extended chirp scaling. In: IGARSS’07, Barcelona, Spain, IEEE, 2007. 148–151
Prats P, Meta A, Scheiber R, et al. A TOPSAR processing algorithm based on extended chirp scaling: evaluation with TerraSAR-X data. In: Proc. EUSAR08, Friedrichshafen, Germany, VDE, 2008
Rostan F, Riegger S, Pitz W, et al. The C-SAR instrument for the GMES sentinel-1 mission. In: IGARSS’07, Barcelona, Spain, IEEE, 2007. 215–218
Belcher D P, Baker C J. High resolution processing of hybrid strip-map spotlight mode SAR. IEE Proc Radar Sonar Navig, 1996, 143: 366–374
Lanari R, Zoffoli S, Sansosti E, et al. New approach for hybrid strip-map/spotlight SAR data focusing. IEE Proc Radar Sonar Navig, 2001, 148: 363–372
Mittermayer J, Lord R, Boerner E. Sliding spotlight SAR processing for TerraSAR-X using a new formulation of the extended chirp scaling algorithm. In: IGARSS’03, Toulouse, France, IEEE, 2003. 1462–1464
Raney R K, Runge H, Bamler R, et al. Precision SAR processing using chirp scaling. IEEE Trans Geosci Remote Sens, 1994, 32: 786–799
Lanari R. A new method for the compensation of the SAR range cell migration based on the chirp z-transform. IEEE Trans Geosci Remote Sens, 1995, 33: 1296–1299
Cumming I G, Neo Y L, Wong F H. Interpretations of the omega-k algorithm and comparisons with other algorithms. In: IGARSS’03, Toulouse, France, IEEE, 2003. 1455–1458
Lanari R, Fornaro G. A short discussion on the exact compensation of the SAR range-dependent range cell migration effect. IEEE Trans Geosci Remote Sens, 1995, 35: 1296–1299
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Bai, X., Sun, J., Hong, W. et al. On the TOPS mode spaceborne SAR. Sci. China Inf. Sci. 53, 367–378 (2010). https://doi.org/10.1007/s11432-010-0030-z
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DOI: https://doi.org/10.1007/s11432-010-0030-z