分布式小卫星SAR多普勒解模糊成像

杨磊; 张磊; 唐禹; 邢孟道; 保铮

doi:10.3724/SP.J.1146.2010.00171

分布式小卫星SAR多普勒解模糊成像

doi: 10.3724/SP.J.1146.2010.00171

杨磊^{* 张磊唐禹邢孟道保铮,},
张磊,
唐禹,
邢孟道,
保铮

基金项目:

高校基本科研业务费(JY10000902026)资助课题

计量
- 文章访问数: 3663
- HTML全文浏览量: 135
- PDF下载量: 740
- 被引次数: 0
出版历程
- 收稿日期: 2010-03-01
- 修回日期: 2010-09-02
- 刊出日期: 2011-02-19

Doppler Ambiguity Suppression SAR Imaging Using Distributed Micro Satellites

Yang Lei^{* 张磊唐禹邢孟道保铮
,},
Zhang Lei,
Tang Yu,
Xing Meng-Dao,
Bao Zheng

摘要

摘要: 该文结合实际卫星轨道及地球自转特性，研究利用分布式小卫星丰富的空域信息解多普勒模糊，从而解决宽场景成像和方位高分辨之间的矛盾。提出建立子孔径坐标系，解决地球自转引起的星间回波不一致性并简化椭圆轨道的几何复杂性。建立子孔径坐标系包括两方面：一是将成像几何模型转换到地球固定坐标系下分析，此时地面场景静止，卫星轨道等效旋转；二是分孔径处理，针对每个子孔径建立坐标几何，经过误差补偿后小卫星轨道构型等效为固定基线且平行。对每个子孔径回波数据分别进行空域滤波解模糊处理后再进行孔径拼接，同时结合传统星载SAR成像算法实现大场景高分辨成像。最后以CARTWHEEL模型为例进行仿真，验证了该方法的有效性。
- 分布式小卫星 /
- 合成孔径雷达 /
- 宽测绘带 /
- 多普勒解模糊 /
- 子孔径坐标系
Abstract: This paper focuses on the generation of wide-swath and high azimuth resolution image with the constellation of micro satellites in the condition of considering the effects of satellite ellipse orbit and earth rotation. The method of coordinate equivalent transformation to overcome the geometric complexity from ellipse orbit and earth rotation is proposed, which includes two aspects: the first is the transformation from earth inertial coordinate to earth fixed coordinate. In this way, the illuminated swath is still and the location vectors of satellites are equivalent rotating. The second is separation of the whole aperture into several sub-apertures and building the relative coordinates in which parallel tracks with constant baseline are obtained and the involved approximation error is numeric analyzed. The Doppler ambiguity is suppressed in every sub-aperture coordinate. Through assembling the sub-apertures, conventional algorithm can be applied to focus the wide-swath and high resolution image. Setting CARTWHEEL as an example, numeric simulation result confirms the validity of the method.
- Distributed micro satellite /
- SAR /
- Wide swath /
- Doppler ambiguity suppression /
- Sub-aperture coordinate

HTML全文

参考文献(1)

Massonnet D. Capabilities and limitations of the interferometric Cartwheel[J].IEEE Transactions on Geoscience Remote Sensing.2001, 39(3):506-520[2]李真芳. 分布式小卫星SAR-InSAR-GMTI的处理方法[D]. [博士论文], 西安电子科技大学, 2006.[3]Currie A and Brown M A. Wide-swath SAR[J].IEE Proceedings F-Radar and Signal Processing.1992, 139(2):122-135[4]Callaghan G D and Longstaff I D. Wide swath spaceborne SAR using a quad element aray[J].IEE Proceedings Radar Sonar and Navigation.1999, 146(3):159-165[5]Goodman N A, Lin S C, Rajakrishna D, and Stiles J M. Processing of multiple receiver spaceborne arrays for wide-area SAR[J]. IEEE Transactions on Geoscience Remote Sensing, 2000, 40(4): 841-852.[6]Gebert N and Krieger G. Digital beamforming on receive: techniques and optimization strategies for high-resolution wide-swath SAR imaging[J].IEEE Transactions on Aerospace Electronic Systems.2009, 45(2):564-592[7]Gebert N and Krieger G. Azimuth phase center adaptation on transmit for high-resolution wide-swath SAR imaging[J].IEEE Geoscience Remote Sensing Letters.2009, 6(4):782-786[8]Li Zheng-fang, Wang Hong-yang, Su Tao, and Bao Zheng. Generation of wide-swath and high-resolution SAR images from multichannel small spaceborne SAR systems[J].IEEE Geoscience Remote Sensing Letters.2005, 2(1):82-86[9]邢孟道, 李真芳, 保铮, 王彤. 分布式小卫星雷达空时频成像方法研究[J]. 宇航学报, 2005, 26(z1): 70-82.Xing Meng-dao, Li Zhen-fang, Bao Zheng, and Wang Tong. Study of distuibuted microsatellites radar space-time- frequency imaging method[J]. Journal of Astronautics, 2005, 26(z1): 70-82.[10]Aguttes J P. New designs or modes for flexible space borne SAR[C]. IGASS 2002, Toronto, Cannda, 2002, 1: 674-676.[11]王昕，朱岱寅，朱兆达. 基于Chirp Scaling的双基SAR成像PFA算法研究[J].电子与信息学报.2009, 31(7):1674-1678浏览Wang Xin, Zhu Dai-yin, and Zhu Zhao-da. Research of polar format algorithm for bistatic SAR imaging based on chirp scaling[J].Journal of Electronics Information Technology.2009, 31(7):1674-1678[12]Zhong Hua and Liu Xing-zhao. An extended nonlinear chirp-scaling algorithm for focusing large-baseline azimuth-invariant bistatic SAR data[J].IEEE Geoscience Remote Sensing Letters.2009, 6(3):548-552

施引文献

资源附件(0)

访问统计