Impacts of velocity deviation on spaceborne high-resolution DPCA SAR

Synthetic aperture radar (SAR) based on displaced phase center azimuth multi-beam (DPCA) allows for high-resolution wide-swath imaging, which can overcome the inherent limitation of conventional single-aperture SAR. However, to obtain a uniform sampling distribution in the azimuth direction, the system parameters must fulfill a stringent requirement. Velocity or pulse repetition frequency (PRF) deviation will result in a nonuniform sampling in the azimuth direction. To resolve this problem, multichannel reconstruction algorithms are often employed. In this paper, the periodic nonuniform sampling in the azimuth direction caused by velocity deviation is investigated and the impacts on imaging performance of spaceborne DPCA SAR are analyzed. Simulation examples and simulation results are also provided.

[1]  Gerhard Krieger,et al.  Multidimensional Waveform Encoding: A New Digital Beamforming Technique for Synthetic Aperture Radar Remote Sensing , 2008, IEEE Transactions on Geoscience and Remote Sensing.

[2]  Gerhard Krieger,et al.  Azimuth Phase Center Adaptation on Transmit for High-Resolution Wide-Swath SAR Imaging , 2009, IEEE Geoscience and Remote Sensing Letters.

[3]  Alberto Moreira,et al.  Extended chirp scaling algorithm for air- and spaceborne SAR data processing in stripmap and ScanSAR imaging modes , 1996, IEEE Trans. Geosci. Remote. Sens..

[4]  Gerhard Krieger,et al.  Errata: Digital Beamforming on Receive: Techniques and Optimization Strategies for High-Resolution Wide-Swath SAR Imaging , 2009 .

[5]  Ian G. Cumming,et al.  Digital Processing of Synthetic Aperture Radar Data: Algorithms and Implementation , 2005 .

[6]  Gerhard Krieger,et al.  High Resolution Wide Swath SAR Imaging with Digital Beamforming - Performance Analysis, Optimization, System Design , 2006 .

[7]  Jr. J. L. Brown.  Multi-channel sampling of low-pass signals , 1981 .

[8]  Zheng Bao,et al.  A novel approach for wide‐swath and high‐resolution SAR image generation from distributed small spaceborne SAR systems , 2006 .

[9]  W. Carrara,et al.  Spotlight synthetic aperture radar : signal processing algorithms , 1995 .

[10]  M. Suess,et al.  A novel high resolution, wide swath SAR system , 2001, IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217).

[11]  Werner Wiesbeck,et al.  Digital beamforming in SAR systems , 2003, IEEE Trans. Geosci. Remote. Sens..

[12]  Gerhard Krieger,et al.  Digital Beamforming on Receive: Techniques and Optimization Strategies for High-Resolution Wide-Swath SAR Imaging , 2009, IEEE Transactions on Aerospace and Electronic Systems.

[13]  Gerhard Krieger,et al.  Unambiguous SAR signal reconstruction from nonuniform displaced phase center sampling , 2004, IEEE Geoscience and Remote Sensing Letters.

[14]  Gerhard Krieger,et al.  SAR signal reconstruction from non-uniform displaced phase centre sampling in the presence of perturbations , 2005, Proceedings. 2005 IEEE International Geoscience and Remote Sensing Symposium, 2005. IGARSS '05..

[15]  John C. Curlander,et al.  Synthetic Aperture Radar: Systems and Signal Processing , 1991 .

[16]  M. A. Brown,et al.  Wide-swath SAR , 1992 .

[17]  S. Quegan.  Spotlight Synthetic Aperture Radar: Signal Processing Algorithms. , 1997 .