Journal of Electronics & Information Technology (电子与信息学报) 2011/33:5 PP.1107-1113
Considering the issue of huge data rate in DBF-SAR system, the feasibility of one-bit quantization under low signal-to-noise ratio condition is analyzed by two methods. In the first method, each sample of echo is quantized into one bit, while in the second, samples of both echo and range matched filter are quantized into one bit. Theoretical analysis and numerical experiments indicate that, both methods can correctly get the positions and scattering characteristic of targets, and keep the spatial resolutions. However, false targets and high side lobe are generated, and false targets become more obvious with higher SNR. Therefore, one-bit quantization is feasible when single channel echo’s SNR is lower than –5 dB.
 Pitz W and Miller D. The TerraSAR-X satellite[J]. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(2): 615-622.
 马仑, 廖桂生, 李真芳. 多通道SAR误差估计与补偿方法及其实测数据验证[J]. 电子与信息学报, 2009, 31(6): 1305-1309. Ma Lun, Liao Gui-sheng, and Li Zhen-fang. An approach for multi-channel SAR array error compensation and its verification by measured data[J]. Journal of Electronics & Information Technology, 2009, 31(6): 1305-1309.
 Wang Wen-qin. Near-space wide-swath radar imaging with multiaperture antenna[J]. IEEE Antennas and Wireless Propagation Letters, 2009, 8(1): 461-464.
 Suess M and Wiesbeck W. Side-looking synthetic aperture radar system[P]. German, EP 1241487A1, 2002.
 Krieger G, Gebert N, and Moreira A. Multidimensional waveform encoding: a new digital beamforming technique for synthetic aperture radar remote sensing[J]. IEEE Transactions on Geoscience and Remote Sensing, 2008, 46(1): 31-46.
 Younis M, Huber S, and Patyuchenko A, et al. Performance comparison of reflector and planarantenna based digital beam-forming SAR[J]. International Journal of Antennas and Propagation, 2009, 2009(1): 1-13.
 Ossowska A. One-bit quantization for synthetic aperture radar with DBF[C]. European Conference on Synthetic Aperture Radar, Friedrichshafen, Germany, 2008, 3: 37-40.
 Schaefer C, Fischer C, and Völker M. One-bit digitization for DBF-SAR: too good to be true[C]. European Conference on Synthetic Aperture Radar, Friedrichshafen, Germany, 2008, 3: 23-26.
 Franceschetti G, Pascazio V, and Schirinzi G. Processing of signum coded SAR signal: theory and experiments[J]. IEE Proceedings-F, 1991, 138(3): 192-198.
 Alberti G, Franceschetti G, and Pascazio V, et al. Time-domain convolution of one-bit coded radar signals[J]. IEE Proceedings-F, 1991, 138(5): 438-444.
 Gebert N, Krieger G, and Moreira A. Digital beamforming on receive: techniques and optimization strategies for high-resolution wide-swath SAR imaging[J]. IEEE Transactions on Aerospace and Electronic Systems, 2009, 45(2): 564-592.
 Krieger G, Gebert N, and Moreira A. Unambiguous SAR signal reconstruction from nonuniform displaced phase center sampling[J]. IEEE Geoscience and Remote Sensing Letters, 2004, 1(4): 260-264.