An Improved Nadir Echo Allocation Scheme for Synthetic Aperture Radar

摘要

In pulsed synthetic aperture radar there are several constraints which restrict the selection of the pulse repetition frequency in order to obtain a good radar image. Also, it is desirable to operate the radar at larger nadir off-set angles in order to observe a wider swath-width. However, this is greatly limited by the increase in range ambiguity and nadir echo interference at large nadir off-set angles. In this paper, we propose an improved nadir echo allocation scheme based on the Extended chirp-mode pulsed radar concept making it possible to operate the SAR system at larger nadir off-set angles and wider swath-width which is highly desirable.