Doppler Ambiguity Suppression SAR Imaging Using Distributed Micro Satellites

Yang  Lei; Zhang  Lei; Tang  Yu; Xing  Meng-Dao; Bao  Zheng

doi:10.3724/SP.J.1146.2010.00171

Volume 33 Issue 2

Mar. 2011

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Yang Lei, Zhang Lei, Tang Yu, Xing Meng-Dao, Bao Zheng. Doppler Ambiguity Suppression SAR Imaging Using Distributed Micro Satellites[J]. Journal of Electronics & Information Technology, 2011, 33(2): 355-362. doi: 10.3724/SP.J.1146.2010.00171

Citation:

Yang Lei, Zhang Lei, Tang Yu, Xing Meng-Dao, Bao Zheng. Doppler Ambiguity Suppression SAR Imaging Using Distributed Micro Satellites[J]. Journal of Electronics & Information Technology, 2011, 33(2): 355-362. doi: 10.3724/SP.J.1146.2010.00171

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Doppler Ambiguity Suppression SAR Imaging Using Distributed Micro Satellites

doi: 10.3724/SP.J.1146.2010.00171

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

Received Date: 2010-03-01
Rev Recd Date: 2010-09-02
Publish Date: 2011-02-19

Abstract

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

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References

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