太赫兹合成孔径雷达的运动补偿  

Motion compensation of the terahertz Synthetic Aperture Radar

作　　者：邓楚强[1] 李崇谊 刘振华[1] 王霞[1] 江涛[1] 

机构地区：[1]南京电子技术研究所,江苏南京210039

出　　处：《太赫兹科学与电子信息学报》2015年第4期550-555,共6页Journal of Terahertz Science and Electronic Information Technology

摘　　要：太赫兹波是电磁波由毫米波向更高频的自然延拓,该频段展现出诸多与传统频段微波迥异的物理特性,使得太赫兹雷达在成像分辨力、成像帧率等性能指标上有望取得突破性的进展。目前,太赫兹合成孔径雷达(SAR)的研究引起了国内外军事界和学术界的极大关注。经分析,太赫兹SAR与传统SAR在多方面存在不同,其中最为重要,也最为关键的区别是运动补偿的处理。虽然运动补偿是所有频段SAR需要谨慎处理的关键技术,但太赫兹SAR的运动补偿显得尤为关键——由于太赫兹波长极短,对常规微波频段SAR影响几乎可以忽略的雷达平台高频微小振动对太赫兹SAR的影响必须得到精细的处理。首先简要介绍常规SAR的运动补偿处理,然后分析不同类型的运动补偿误差对太赫兹SAR成像的影响,重点分析了高频振动误差的影响,并借鉴振动目标成像的思路,提出振动平台太赫兹SAR的运动补偿解决方案,最后通过数值实验验证了本文所提出的振动补偿方法。Terahertz wave is the natural extension of the electromagnetic wave from the millimeterwave to the higher band. Extraordinary physical properties are exhibited in this band, which makes the breakthrough advance of the resolution and the image frame of terahertz Synthetic Aperture Radar(SAR) possible. Much attention has been attracted to the research of the terahertz SAR. There are many differences between the terahertz SAR and the traditional SAR, one of the most important difference is the treatment on the motion compensation. Because of the wavelength of the Terahertz SAR is much shorter than that of traditional microwave, the compensation of the tiny vibration of the platform which can be ignored at the traditional SAR should be treated precisely. The motion compensation method of the traditional SAR is reviewed briefly. The impacts of all kinds of motion error are included, and the impact of the high frequency vibration is analyzed in detail. A motion compensation method is proposed according to the imaging method of the vibration targets. The numerical tests validate the proposed method.

关 键 词：太赫兹SAR 雷达 运动补偿 高频振动 

分 类 号：TN957.51[电子电信—信号与信息处理]