A unified error estimation method for multi-modes SF-SAR in bandwidth synthesis processing
Conference: EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar
06/04/2018 - 06/07/2018 at Aachen, Germany
Proceedings: EUSAR 2018
Pages: 6Language: englishTyp: PDF
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Authors:
Bin, Jing Guo; Sun, Guang-Cai (National Key Laboratory of Radar Signal Processing, Xidian University, P.R. China)
Xing, Mengdao; Sheng, Jialian (Shanghai radio equipment research Institute, China)
Bao, Zheng; Liu, Yanyang (Shanghai Institute of Satellite Engineering, P.R. China)
Abstract:
Stepped frequency chirps can be used to generate high resolution range profiles (HRRP) by using spectrum synthesis. There are three distributed modes of stepped frequency SAR (SF-SAR). However, the presence of channel phase errors may degrade the performance of HRRP synthesis. This letter presents a unified error estimation method to address this problem. First, to obtain a focused sub-band image, a range phase adjustment by contrast enhancement (RPACE) algorithm is proposed to estimate inner-channel high-order phase errors. Second, a side-lobe balanced model (SLBM) is established to estimate constant phase error from the relationship between the balanced side-lobe and constant phase; the constant phase error can be directly obtained in an efficient manner. Experimental analysis using real data demonstrates the effectiveness of the proposed method.