A Robust Time-domain Algorithm for Multichannel HRWS SAR Imaging

Konferenz: EUSAR 2021 - 13th European Conference on Synthetic Aperture Radar
29.03.2021 - 01.04.2021 in online

Tagungsband: EUSAR 2021

Seiten: 4Sprache: EnglischTyp: PDF

Wang, Yuekun; Wei, Zhonghao; Zhuang, Long; Han, Chuanzhao (Nanjing Research Institute of Electronics Technology, Nanjing, China)

Azimuth multichannel (AMC) synthetic aperture radar (SAR) system via digital beam forming (DBF) processing is capable of realizing high-resolution and wide-swath (HRWS) focusing, which presents huge potentials for Earth observation. A robust minimum-entropy-based weighted back-projection algorithm (ME-WBPA), a time-domain algorithm, is developed to obtain high-quality images for AMC HRWS SAR in this paper. Considering phase mismatches among receiving channels, the signal model in SAR complex-imagery domain is first established. Then, channel phase biases can be estimated and calibrated according to minimum entropy criterion. Validation of the proposed approach is demonstrated with the real measured airborne AMC SAR data.