Coherent Auto-Calibration of APE and NsRCM under Fast Back-Projection Image Formation for Airborne SAR Imaging in Highly-Squint Angle

Lei Yang 1,†, Song Zhou 2,*, Lifan Zhao 3 and Mengdao Xing 4 1 Tianjin Key Laboratory for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China; [email protected] or [email protected] 2 School of Electronic Information and Engineering, Nanchang University, Nanchang 330031, China 3 School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, S2-B3a-06, 639798, Singapore; [email protected] 4 National Key Lab for Radar Signal Processing, Xidian University, Xi’an 710071, China; [email protected] * Correspondence: [email protected]; Tel.: +86-18942329786 † Current address: College of Electronic Information and Automation, D-301, Civil Aviation University of China (South), No. 2898, Tianjin Jinbei Road, Dongli District, Tianjin 300300, China.