Monopulse instantaneous 3D imaging for wideband radar system  

作　　者：LI Yuhan QI Wei DENG Zhenmiao FU Maozhong ZHANG Yunjian 

机构地区：[1]School of Information,Xiamen University,Xiamen 361005,China [2]Beijing Institute of Tracking and Telecommunications Technology,Beijing 100094,China [3]School of Electronics and Communication Engineering,Sun Yat-sen University,Guangzhou 510275,China

出　　处：《Journal of Systems Engineering and Electronics》2021年第1期53-67,共15页系统工程与电子技术（英文版）

基　　金：supported by the Science and Technique Commission Foundation of Fujian Province(2018H6023)。

摘　　要：To avoid the complicated motion compensation in interferometric inverse synthetic aperture(InISAR)and achieve realtime three-dimensional(3 D)imaging,a novel approach for 3 D imaging of the target only using a single echo is presented.This method is based on an isolated scatterer model assumption,thus the scatterers in the beam can be extracted individually.The radial range of each scatterer is estimated by the maximal likelihood estimation.Then,the horizontal and vertical wave path difference is derived by using the phase comparison technology for each scatterer,respectively.Finally,by utilizing the relationship among the 3 D coordinates,the radial range,the horizontal and vertical wave path difference,the 3 D image of the target can be reconstructed.The reconstructed image is free from the limitation in InISAR that the image plane depends on the target's own motions and on its relative position with respect to the radar.Furthermore,a phase ambiguity resolution method is adopted to ensure the success of the 3 D imaging when phase ambiguity occurs.It can be noted that the proposed phase ambiguity resolution method only uses one antenna pair and does not require a priori knowledge,whereas the existing phase ambiguity methods may require two or more antenna pairs or a priori knowledge for phase unwarping.To evaluate the performance of the proposed method,the theoretical analyses on estimation accuracy are presented and the simulations in various scenarios are also carried out.

关 键 词：cross-correlation operation phase ambiguity resolution wave path difference estimation monopulse three-dimensional(3D)imaging 

分 类 号：TN957.52[电子电信—信号与信息处理]