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| Digital Beamforming for Single Phase Center Multi-beam Spaceborne SAR Based on Intrapulse Beamsteering |
| Li Yang①② Qi Wei-kong①② Huang Jie-wen①② Yu Wei-dong① |
| ①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(Graduate University of the Chinese Academy of Sciences, Beijing 100049, China) |
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Abstract This paper studies single phase center multi-beam spaceborne SAR based on intrapulse beamsteering by combining spaceborne Single Phase Center Multi-Beam (SPCMB-SAR) and intrapulse beamsteering in order to reduce large azimuth ambiguity. The principle of digital beamforming for receiving signal process is explored, including azimuth DBF, elevation DBF and two-dimensional DBF. Three kinds of DBF processing methods are proposed, including azimuth DBF first and elevation DBF later, elevation DBF first and azimuth DBF later, and two-dimensional DBF. The primary system parameters are analyzed. Data rate and calculation complexity of the three methods are compared. Simulation results show that all methods are effective. Ambiguity analysis confirms that the SPCMB-SAR system proposed in this paper can reduce range ambiguity and azimuth ambiguity and realize high resolution wide swath SAR imaging effectively.
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Received: 28 July 2010
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Corresponding Authors:
Li Yang
E-mail: liyang_lee1983@126.com
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2011, Vol. 33 
