스퀸트 SAR 시스템을 위한 최적화된 RCM 궤적의 기하학적 분석

Abstract

In this study, an optimized characteristic function of the range cell migration(RCM) trajectory for a squint synthetic-aperture radar(SAR) system is analyzed using a geometric approach, and its performance is validated through the reconstruction of an SAR image. To achieve this, a range equation of a squint SAR system is developed in a rotational transformed coordinate, and the characteristic function of the RCM trajectory is transformed to the Doppler domain using a frequency-modulated continuous wave-SAR signal model and Fourier-transform-based signal transformation process. This formula developed through geometric analysis is applied in RCM correction and matched filtering for squint SAR image processing. Its optimized performance is compared and validated in the same process. The analysis results indicate that the resolution included an error of approximately 5 %, compared with the predicted result, in the analysis range within a squint angle of 45°.