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运动误差对太赫兹圆迹SAR成像质量影响分析

Imaging quality analysis of terahertz circular SAR affected by the motion error

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摘要

太赫兹圆迹合成孔径雷达(SAR)结合了太赫兹波和圆迹SAR技术,比传统的直线SAR具有更高的成像分辨力,在雷达领域拥有广阔的应用前景。雷达实际运动中存在的运动误差将导致成像聚焦差、旁瓣升高和分辨力下降,是影响雷达成像质量的重要因素,在太赫兹圆迹SAR中,雷达的成像质量受运动误差的影响是各个方位向的运动误差共同作用的。为了分析运动补偿时所需达到的精确度,建立了太赫兹圆迹SAR的运动误差模型,定量分析了运动误差存在时目标的峰值下降系数,并根据峰值下降系数分析了运动误差对成像质量的影响,包括分辨力、峰值旁瓣比(PSLR)和积分旁瓣比(ISLR)的变化,同时通过仿真验证了分析的正确性。

Abstract

The Terahertz circular Synthetic Aperture Radar(SAR) which combines the terahertz wave and the circular SAR can obtain the higher imaging resolution compared to the traditional linear SAR,and it has a broad application prospect in the radar field. An important factor which influences the imaging quality of radar is the motion error in the real movement which will cause the bad focusing effect, high side lobe and decline in resolution. In the imaging process of terahertz circular SAR,the imaging quality affected by the motion error is determined by the motion errors in different directions together. In order to analyze the accuracy of motion compensation,this paper makes the model of motion error in the terahertz circular SAR and the quantitative analysis of target’s peak descent coefficient of target when the motion error exists. The changes of imaging qualities in cluded resolution,Peak Sidelobe Ratio(PSLR) and Integrated Sidelobe Ratio(ISLR) are quantitativly analyzed by the descent coefficient. Besides,this paper makes some simulations to prove the correctness of analysis. The analysis shows important guiding significance for the imaging of terahertz circular SAR.

Newport宣传-MKS新实验室计划
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中图分类号:TN957

DOI:10.11805/tkyda201806.0955

所属栏目:太赫兹科学技术

基金项目:国家自然科学基金青年科学基金资助项目(41601508);上海市自然科学基金资助项目(15ZR1439500)

收稿日期:2018-03-26

修改稿日期:2018-07-13

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作者单位    点击查看

阚学超:上海无线电设备研究所,上海 200090上海目标识别与环境感知工程技术研究中心,上海 200090
李银伟:上海无线电设备研究所,上海 200090上海目标识别与环境感知工程技术研究中心,上海 200090
盛佳恋:上海无线电设备研究所,上海 200090上海目标识别与环境感知工程技术研究中心,上海 200090
付朝伟:上海无线电设备研究所,上海 200090上海目标识别与环境感知工程技术研究中心,上海 200090
王海涛:上海无线电设备研究所,上海 200090上海目标识别与环境感知工程技术研究中心,上海 200090

联系人作者:阚学超(1071649298@qq.com)

备注:阚学超(1993–),男,河南省驻马店市人,在读硕士研究生,主要研究方向为SAR/ISAR成像算法、太赫兹雷达高分辨成像.email: 1071649298@qq.com.

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引用该论文

KAN Xuechao,LI Yinwei,SHENG Jialian,FU Chaowei,WANG Haitao. Imaging quality analysis of terahertz circular SAR affected by the motion error[J]. Thz, 2018, 16(6): 955-961

阚学超,李银伟,盛佳恋,付朝伟,王海涛. 运动误差对太赫兹圆迹SAR成像质量影响分析[J]. 太赫兹科学与电子信息学报, 2018, 16(6): 955-961

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