title: A Robust Range Grating Lobe Suppression Method Based on Image Contrast for Stepped-Frequency SAR.
abstract: The magnitude error and phase error (MEPE) in the transfer function of a stepped-frequency synthetic aperture radar (SAR) system results in a periodic MEPE in the synthesized wideband waveform (SWW), which induces the grating lobes in the high-resolution range profile (HRRP). In this paper, a robust data-driven grating lobe suppression (GLS) method is proposed. Based on a contrast-based error estimation method and the grating lobes of the brightest scatterers in the SAR image, the periodic MEPE can be robustly estimated using the proposed method. By compensating the estimated periodic MEPE, the range grating lobes can be suppressed to the background level of the SAR image. Simulation results and real data processing have demonstrated the superiority of the proposed method.
authors.affiliation: Beijing Key Laboratory of Embedded Real-Time Information Processing Technology, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China. wbingao@gmail.com.
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Gao
authors.affiliation: Beijing Key Laboratory of Embedded Real-Time Information Processing Technology, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China. longteng@bit.edu.cn.
authors.forename: Teng
authors.initials: T
authors.lastname: Long
authors.affiliation: Beijing Key Laboratory of Embedded Real-Time Information Processing Technology, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China. z.ding@bit.edu.cn.
authors.forename: Ze-Gang
authors.initials: ZG
authors.lastname: Ding
authors.affiliation: National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China. wyr@mail.ie.ac.cn.
authors.forename: Yi-Rong
authors.initials: YR
authors.lastname: Wu
keywords: contrast-based; grating lobe suppression (GLS); magnitude error and phase error (MEPE); stepped-frequency; synthetic aperture radar (SAR)