雷达学报2021，Vol.10Issue(5)：699-717,19.DOI:10.12000/JR21094
涡旋雷达高分辨率稀疏自校正相位误差成像
High-resolution Sparse Self-calibration Imaging for Vortex Radar with Phase Error
摘要
Abstract
The Orbital Angular Momentum (OAM)-based vortex radar has drawn increasing attention because of its potential for high-resolution imaging. The vortex radar high resolution imaging with limited OAM modes is commonly solved by sparse recovery, in which the prior knowledge of the imaging model needs to be known precisely. However, the inevitable phase error in the system results in imaging model mismatch and deteriorates the imaging performance considerably. To address this problem, the vortex radar imaging model with phase error is established for the first time in this work. Meanwhile, a two-step self-calibration imaging method for vortex radar is proposed to directly estimate the phase error. In the first step, a sparsity-driven algorithm is developed to promote sparsity and improve imaging performance. In the second step, a self-calibration operation is performed to directly compensate for the phase error. By alternately reconstructing the targets and estimating the phase error, the proposed method can reconstruct the target with high imaging quality and effectively compensate for the phase error. Simulation results demonstrate the advantages of the proposed method in enhancing the imaging quality and improving the phase error estimation performance.关键词
涡旋雷达成像/轨道角动量/相位误差/自校正/稀疏恢复Key words
Vortex radar imaging/Orbital Angular Momentum (OAM)/Phase error/Self-calibration/Sparse re-covery分类
信息技术与安全科学引用本文复制引用
屈海友,程迪,陈畅,陈卫东..涡旋雷达高分辨率稀疏自校正相位误差成像[J].雷达学报,2021,10(5):699-717,19.基金项目
Foundation Item:The National Natural Science Foundation of China(61971392) （61971392）
