文档介绍：平流层飞艇SAR成像优化策略研究
贾高伟杨希祥
(国防科技大学空天科学学院湖南长沙 410073)
摘要:平流层飞艇具有驻空高度高、覆盖范围广、驻空时间久、使用效费比高等特点,在侦察监视等领域应用前景广阔。结合平流层飞艇平台特性,分析了平流层飞艇合成孔径雷达(Synthetic Aperture Radar, SAR)与机载SAR的异同;针对平流层飞艇SAR的PRF冗余及大振幅低频率运动误差,提出了优化方案,并开展了仿真分析验证。仿真结果表明本文提出的优化运动补偿方法能够有效消除平流层飞艇运动误差影响。
关键词:平流层飞艇;快速响应;SAR系统
中图分类号:TN95 文献标志码:A 文章编号:
Imaging Optimization for Stratospheric Airship SAR
JIA Gaowei, YANG Xixiang
(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073)
Abstract:As a new SAR carrier, stratospheric airship has the potential as large observation area, long drift time, and better efficiency. It is expected in many different applications, such as reconnaissance, surveillance, and environmental monitoring. In the paper, the imaging difference between the stratospheric airship SAR and airplane SAR pared. To improve the imaging efficiency, the optimization strategy according to redundant PRF and large amplitude trajectory deviation, respectively. Eventually, necessary simulation test is presented to validate the proposed method.
Keywords: Stratospheric Airship; Fast response; Synthetic aperture radar
目前,我国SAR系统搭载平台主要有天基、空基和地基三种:近地轨道遥感卫星轨道高度在500km~800km之间,能够对固定目标或移动速度较慢目标实施高分辨侦察,但星载SAR系统开发成本高,代价大,轨道运行特性使其难以对突发关键区域进行快速观测响应。
相比于卫星,飞机的飞行高度低、机动灵活,但滞空时间短,机载SAR往往需要高额费用和高频率出勤率才能实现大范围、长时间的预警、侦察和监视。地基ISAR对空侦察的范围受到观测点地域限制,监视范围小,不能适应在广阔海域中的应用需求。
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