基于Radon-CPF-Fourier变换的机动目标ISAR成像  

ISAR Imaging of Maneuvering Targets Based on Radon-CPF-Fourier Transform

作　　者：陈清刚 刘文魁 梁晨光 杨峻巍[1] 余湋[1] 王鑫涛 曾操 CHEN Qinggang;LIU Wenkui;LIANG Chenguang;YANG Junwei;YU Wei;WANG Xintao;ZENG Cao(Southwest China Institute of Electronic Technonlogy,Chengdu 610036,China;Unit 61768 of PLA,Sanya 725099,China;Beijing Institude of Astronautical System Engineering,Beijing 100076,China;School of Electronic Engineering,Xidian University,Xi′an 710071,China)

机构地区：[1]中国西南电子技术研究所,成都610036 [2]解放军61768部队,海南三亚572099 [3]北京宇航系统工程研究所,北京100076 [4]西安电子科技大学电子工程学院,西安710071

出　　处：《电讯技术》2020年第6期632-638,共7页Telecommunication Engineering

基　　金：装备预研领域基金项目(61404130111)。

摘　　要：由于机动目标的逆合成孔径雷达(Inverse Synthetic Aperture Radar,ISAR)成像中存在多普勒扩散现象,易导致成像分辨率降低。针对此问题,在多分量三次相位信号(Cubic Phase Signal,CPS)模型基础上,提出一种基于Radon-CPF-Fourier变换(Radon-Cubic Phase Function-Fourier Transform,RCFT)的机动目标ISAR成像方法。RCFT可实现CPF中自项能量的相干积累,减轻多普勒扩散带来的影响。与现有的基于时频分析和参数估计的ISAR成像算法相比,RCFT的主副比性能提升了至少2 dB,在时频分辨率无损失时具备更好的自项能量积累能力,可获得更高质量的成像结果。仿真验证了所提方法的有效性。Due to the Doppler frequency spread in the inverse synthetic aperture radar(ISAR)imaging of maneuvering targets,the imaging resolution is reduced.For the problem,based on the multi-component cubic phase signal(CPS)model,an ISAR imaging method for maneuvering targets based on Radon-Cubic Phase Function-Fourier transform(RCFT)is proposed.The coherent accumulation of auto-terms energy in cubic phase function(CPF)can reduce the impact of Doppler frequency spread.Compared with the existing ISAR imaging algorithms based on time-frequency analysis and parameter estimation,the performance of RCFT’s peak sidelobe ratio is improved by at least 2 dB.RCFT has better auto-term energy accumulation capacity without loss of time-frequency resolution,and can obtain higher quality imaging results.Simulation proves the effectiveness of the proposed method.

关 键 词：逆合成孔径雷达 机动目标 Radon-CPF-Fourier变换 时频分辨率 

分 类 号：TN957.5[电子电信—信号与信息处理]