随着卫星技术的发展与成熟，星载分布式SAR和中高轨SAR越来越受到关注，但是其较长的合成孔径时间和大基线距对双站SAR成像提出了新的要求。基于单站等效思路，提出一种基于Bakhshali近似的双曲等效方法，设计了适用于该方法的CS成像流程。与基于泰勒二阶近似的双曲等效方法相比，该方法满足长合成孔径时间和基线距变化较大的情况下的成像要求。最后通过星载双站SAR的仿真实验验证了该方法的有效性。
Distributed spaceborne SAR and medium-or high-orbit SAR are receiving increasing focus with the development of satellite technology, while the extended synthetic aperture length and long baseline pose new challenges to the bistatic SAR imaging. In this work we propose a new hyperbolic equivalence method based on Bakhshali approximation. Besides, an appropriate CS imaging procedure is designed. Compared to the original method, the proposed method meets the requirements. Finally, the simulation results verify the validity of the proposed method.
[1] 魏钟铨.合成孔径雷达卫星[M].北京:科学出版社,2001:1-8.
[2] 黄丽佳,仇晓兰,胡东辉,等.机载双站聚束SAR改进ωK算法[J].电子与信息学报,2013,35(9):2154-2160.
[3] 胡继伟,洪峻.基于三维重建的分布式卫星SAR干涉测高模型及误差分析[J].中国科学院大学学报,2011,28(4):489-497.
[4] 陈立福,林月冠,彭曙蓉,等.一种用于机载双天线InSAR系统的实时DEM生成方法及实现[J].中国科学院大学学报,2014,31(5):678-684.
[5] 仇晓兰,丁赤飚,胡东辉.双站SAR成像处理技术[M].北京:科学出版社,2010:8-9.
[6] 刘建平,梁甸农.主星带伴随分布式小卫星雷达系统的波束同步分析[J].国防科技大学学报,2006,28(2):54-58.
[7] Younis M, Metzig R, Krieger G. Performance prediction of a phase synchronization link for bistatic SAR[J]. IEEE Geoscience and Remote Sensing Letters, 2006, 3(3):429-433.
[8] Loffeld O, Nies H, Peters V, et al. Models and useful relations for bistatic SAR processing[J]. IEEE Transanctions on Geoscience and Remote Sensing, 2004, 42(10):2031-2038.
[9] Natroshvili K, Loffeld O, Nies H, et al. Focusing of general bistatic SAR configuration data with 2-D inverse scaled FFT[J]. IEEE Transanctions on Geoscience and Remote Sensing, 2006, 44(10):2718-2727.
[10] Neo Y L, Wong F, Cumming I G. A two-dimensional spectrum for bistatic SAR processing using series reversion[J]. IEEE Geoscience and Remote Sensing Letters, 2007, 4(1):93-96.
[11] 李冉,皮亦鸣,张晓玲.基于改进Bp算法的机载双基地Sar成像[J].雷达科学与技术,2006,4(6):348-352.
[12] Aria D, Guarnieri A M, Rocca F. Focusing bistatic synthetic aperture radar using dip move out[J]. IEEE Transanctions on Geoscience and Remote Sensing, 2004, 42(7):1362-1376.
[13] Ding J, Zhang Z, Xing M, et al. A new look at the bistatic-to-monostatic conversion for Tandem SAR image formation[J]. IEEE Geoscience and Remote Sensing Letters, 2008, 5(3):392-395.
[14] 闫鸿慧,王岩飞,于海锋,等.一种基于距离补偿的分布式小卫星双基Sar成像方法[J].电子与信息学报,2005,27(5):771-774.
[15] Bamler R, Meyer F, Liebhart W. Processing of bistatic SAR data from quasi-stationary configuration[J]. IEEE Transan-ctions on Geoscience and Remote Sensing, 2007, 45(11):3350-3358.
[16] Bamler R, Boerner E. On the use of numerically computed transfer functions for processing of data from bistatic SARs and high squint orbital SARs//International Geoscience and Remote Sensing Symposium, 2005, 86(86):1051-1055.
[17] Channabasappa M N. On the square root formula in the Bakhshali manuscript[J]. Indian Journal of History of Science Calcutta, 1976, 11:112-124.
[18] Duersch M I. Backprojection for Synthetic Aperture Radar. Provo:Brigham Young University, 2013.
[19] Qiu X L, Hu D H, Ding C B. Focusing bistatic images use RDA based on hyperbolic approximating//International Conference on Radar. Shanghai, 2006:1323-1326.
[20] Clemente C, Soraghan J J. Approximation of the bistatic slant range using Chebyshev polynomials[J]. IEEE Geoscience and Remote Sensing Letters, 2012, 9(4):682-686.
[21] 田卫明,曾涛,胡程.基于导航信号的BiSAR成像技术[J].雷达学报,2013,2(1):39-45.
[22] Cumming I G, Wong F.合成孔径雷达成像:算法与实现[M].洪文,胡光辉,译.北京:电子工业出版社,2012:192-193.
[23] 张升康,杨汝良.双基地合成孔径雷达扩展Chirp Scaling成像算法[J].中国科学院大学学报,2008,25(1):101-109.
