Generalized Frequency Scaling and Backprojection for LFM-CW SAR Processing

作者：Zaugg Evan C^*; Long David G

来源：IEEE Transactions on Geoscience and Remote Sensing, 2015, 53(7): 3600-3614.

DOI：10.1109/TGRS.2014.2380154

• Radar imaging
• synthetic aperture radar (SAR)

This paper presents a generalized treatment of image formation for a linear-frequency-modulated continuous wave (LFM-CW) synthetic aperture radar (SAR) signal, which is a key technology in making very small SAR systems viable. The signal model is derived, which includes the continuous platform motion. The effect of this motion on the SAR signal is discussed, and an efficient compensationmethod is developed. Processing algorithms are developed including precise and approximate backprojection methods and a generalized frequency scaling algorithm that accounts for an arbitrary number of terms of a Taylor expansion approximation of the SAR signal in the Doppler frequency domain. Together, these algorithms allow for the processing of LFM-CW SAR data for a wide variety of system parameters, even in scenarios where traditional algorithms and signal approximations break down.

• 出版日期2015-7