An imaging algorithm for airborne circular scanning SAR based on the method of series reversion

作者：Liao Yi^*; Zhou Song; Xing Meng Dao; Bao Zheng

来源：Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology, 2012, 34(11): 2587-2593.

DOI：10.3724/SP.J.1146.2012.00441

• Circular orbit
• Circular scanning
• Comparison result
• Doppler frequency
• Expansion coefficients
• Imaging algorithm
• Imaging analysis
• Imaging modes
• Imaging processing
• Point targets
• Range cell migration correction
• Range compression
• Series expansion
• Series reversion
• Stationary phase point
• Strip-map mode
• Target echo
• Two-dimension spectrums

Compared with the traditional strip map mode, as a new imaging mode, Circular Scanning SAR (CSSAR) can be used to perform imaging with a wider area in a shorter time. However, due to the influence of the circular orbit, it is difficult to obtain the two-dimension spectrum of the target echo signal which brings a lot of obstacles to the following imaging processing. Thus, a new method for CSSAR imaging based on series reversion is proposed in this paper. By unfolding the Doppler frequency, the stationary phase point expansion coefficients are obtained, making it easy to access the signal's two-dimension spectrum, through which range compression and range cell migration correction can be implemented effectively. Furthermore, the accuracy of the spectrum is controlled by keeping enough terms in the two series expansions, which is helpful to the imaging analysis and the following processing. Finally, the feasibility of the proposed approach is validated with the point target simulations and the comparison results.

• 出版日期2012
• 单位西安电子科技大学