Moving Targets Imaging in Spaceborne TOPS SAR
Keywords:
Doppler parameter estimation, moving target imaging, Synthetic Aperture Radar (SAR), Terrain Observation by Progressive Scans (TOPS)Abstract
Terrain Observation by Progressive Scans (TOPS) is the spaceborne wide swath synthetic aperture radar (SAR) imaging mode and attractive for ocean remote sensing. Its imaging processors are quite different from the one of the conventional stripmap mode due to antenna beam progressive scanning. This paper proposes a new imaging processor in TOPS for moving targets especially for moving ships in ocean. In addition to resolving the azimuth aliasing problem in TOPS, the Doppler parameter estimation is the key point of the proposed processor. According to the estimated Doppler parameters, some transfer functions of the processor should be updated. Simulation results on point and distributed targets validate the proposed imaging processor.
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References
F. De Zan and A. Monti Guarnieri, “TOPSAR: Terrain observation by progressive scans,” IEEE Trans. Geosci. Remote Sens., vol. 44, no. 9, pp. 2352-2360, Sep. 2006.
A. Meta, J. Mittermayer, P. Prats, R. Scheiber, and U. Steinbrecher, “TOPS imaging with TerraSARX: Mode design and perfomance analysis,” IEEE Trans. Geosci. Remote Sens., vol. 48, no. 2, pp. 759-769, Feb. 2010.
W Xu, P. Huang, and Y. Deng, “An efficient imaging approach with scaling factors for TOPS mode SAR data focusing,” IEEE Geosci Remote Sens Lett., vol. 8, no. 5, pp. 929-933, Oct. 2011.
P. Prats, R. Scheiber, J. Mittermayer, A. Meta, and A. Moreira, “Processing of sliding spotlight and TOPS SAR data using baseband azimuth scaling,” IEEE Trans. Geosci. Remote Sens., vol. 48, no. 2, pp. 770-780, Feb. 2010.
W Xu, P. Huang, and Y. Deng, “TOPSAR data focusing based on azimuth scaling preprocessing,” Adv. Space Res., vol. 48, no. 2, pp. 270-277, 2011.
W. Xu, Y. Deng, and R. Wang, “Imaging processor for different spacebarne SAR imaging modes,” IET Elect. Lett., vol. 48, no. 6, pp. 340-342, Mar. 2012.
W. Xu, P. Huang, Y. Deng, and R. Wang, “TOPSmode raw data processing using chirp scaling algorithm,” IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 7, no. 1, pp. 235-246, 2014.
S. Zhu, G. Liao, Y. Qu, Z. Zhou, and X. Liu, “Ground moving targets imaging algorithm for synthetic aperture radar,” IEEE Trans. Geosci. Remote Sens., vol. 49, no. 1, pp. 462-477, Jan. 2011.
J. K. Jao, “Theory of synthetic aperture radar imaging of a moving target,” IEEE Trans. Geosci. Remote Sens., vol. 39, no. 9, pp. 1984-1992, Sep. 2001.
W. Zhou, J.-T. Wang, H. W. Chen, and X. Li, “Signal model and moving target detection based on MIMO synthetic aperture radar,” Progress In Electromagnetics Research, vol. 131, pp. 311-329, 2012.
I. G. Cumming and F. H. Wong, Digital Processing of Synthetic Aperture Radar Data: Algorithms and Implementation, Artech House, Norwood, MA, 2005.
A. Moreira, J. Mittermayer, and R. Scheiber, “Extended chirp scaling algorithm for air- and spaceborne SAR data processing in stripmap and ScanSAR imaging modes,” IEEE Trans. Geosci. Remote Sens., vol. 34, no. 5, pp. 1123-1136, Sep. 1996.
