摘要
逆合成孔径雷达(ISAR)成像技术因其能够提供目标的高分辨率二维图像,已经成为军事侦察、地球观测和灾害监测等领域的重要工具,但是,由于目标的复杂运动,传统的ISAR成像方法往往会出现图像模糊和失真的问题。距离多普勒(RD)算法通过对雷达回波数据进行二维傅里叶变换,可以有效地抑制目标的复杂运动对ISAR图像的影响,从而获得更清晰、更精确的图像,然而,在处理目标加速度和微动方面存在局限性。文中首先说明了ISAR的成像原理,介绍了运动补偿中的包络对齐,在此基础上,提出一种改进的包络对齐方法,通过某卫星成像对该算法进行验证,证明了该方法的适用性和灵活性,运用改进的包络对齐方法对某型舰载机成像,发现该方法可以有效地提高ISAR图像的质量和分辨率。
Since the ISAR(inverse synthetic aperture radar)imaging technology can provide high-resolution two-dimensional images of targets,it has become an important tool in the fields of military reconnaissance,earth observation,and disaster monitoring.However,due to the complex motion of the targets,the traditional ISAR imaging methods often result in blurred and distorted images.The Range-Doppler(RD)algorithm,by performing a two-dimensional Fourier transform on radar echo data,can effectively suppress the impact of the target's complex motion on the ISAR image,so as to obtain clearer and more accurate images.However,the RD algorithm has limitations in handling target acceleration and micro-movement.In this paper,the imaging principle of ISAR is explained first,and then the envelope alignment in motion compensation is introduced.On this basis,an improved envelope alignment method is proposed.It is verified by imaging of a certain satellite.The verification results prove its applicability and flexibility.The improved envelope alignment method is applied to the imaging of a certain type of shipborne aircraft,and it is found that the proposed method can effectively improve the quality and resolution of ISAR images.
作者
彭关弘烨
任新成
王玉清
赵晔
杨鹏举
PENG Guanhongye;REN Xincheng;WANG Yuqing;ZHAO Ye;YANG Pengju(School of Physics and Electronic Information,Yan’an University,Yan’an 716000,China)
出处
《现代电子技术》
北大核心
2024年第7期66-72,共7页
Modern Electronics Technique
基金
国家自然科学基金资助项目(61861043)
国家自然科学基金资助项目(62261054)
国家自然科学基金资助项目(62061048)。
