An equivalent side-looking method for squint FMCW SAR

作者：Liang Yi^*; Guo Liang; Xing Meng Dao; Bao Zheng

来源：Acta Electronica Sinica, 2009, 37(6): 1159-1164.

• Azimuth focusing depth
• Continuous motions
• Doppler frequency shift
• Equivalent side-looking method
• Frequency-modulated continuous waves
• Image focusing
• Imaging algorithm
• Non-linear chirp scaling
• Pre-processing
• SAR data
• SAR system
• Side-looking
• Simulated data
• Squint angles
• Squint FMCW SAR

Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) is a new conceptual SAR system. This paper analyses the effect of the platform's continuous motion in squint FMCW SAR, i.e. generating Doppler frequency shift, and its effect on image focusing. Considering the deficiency of the present FS algorithm in the case of high squint angle, this paper proposes an equivalent side-looking method for squint FMCW SAR. After pre-processing for the squint SAR data, we can use the imaging algorithm for side-looking mode to process the squint SAR data; for the azimuth focusing depth induced by the pre-processing, this paper utilizes the azimuth non-linear chirp scaling algorithm to overcome this phenomenon. At last, imaging results of the simulated data have proved the validity of the proposed algorithm.

• 出版日期2009
• 单位西安电子科技大学