title: Road-Aided Ground Slowly Moving Target 2D Motion Estimation for Single-Channel Synthetic Aperture Radar.
abstract: To detect and estimate ground slowly moving targets in airborne single-channel synthetic aperture radar (SAR), a road-aided ground moving target indication (GMTI) algorithm is proposed in this paper. First, the road area is extracted from a focused SAR image based on radar vision. Second, after stationary clutter suppression in the range-Doppler domain, a moving target is detected and located in the image domain via the watershed method. The target's position on the road as well as its radial velocity can be determined according to the target's offset distance and traffic rules. Furthermore, the target's azimuth velocity is estimated based on the road slope obtained via polynomial fitting. Compared with the traditional algorithms, the proposed method can effectively cope with slowly moving targets partly submerged in a stationary clutter spectrum. In addition, the proposed method can be easily extended to a multi-channel system to further improve the performance of clutter suppression and motion estimation. Finally, the results of numerical experiments are provided to demonstrate the effectiveness of the proposed algorithm.
authors.affiliation: Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. zhirui1990@126.com.
authors.forename: Zhirui
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China. xujia@bit.edu.cn.
authors.forename: Jia
authors.initials: J
authors.lastname: Xu
authors.affiliation: School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China. hzzhit@126.com.
authors.forename: Zuzhen
authors.initials: Z
authors.lastname: Huang
authors.affiliation: Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. zhangxd@mail.tsinghua.edu.cn.
authors.forename: Xudong
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA. xianggen@gmail.com.
authors.forename: Xiang-Gen
authors.initials: XG
authors.lastname: Xia
authors.affiliation: 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: Insititute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. baoqiancherry@163.com.
authors.forename: Qian
authors.initials: Q
authors.lastname: Bao
keywords: ground moving target indication (GMTI); parameter estimation; radar vision; road extraction; synthetic aperture radar (SAR)