System Design for Geosynchronous Synthetic Aperture Radar Missions
System Design for Geosynchronous Synthetic Aperture Radar Missions
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DOI：
10.1109/tgrs.2014.2318171
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发表时间：
2014-12-01
影响因子：
8.2
通讯作者：
Whittaker, Philip
中科院分区：
文献类型：
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作者：
Hobbs, Stephen;Mitchell, Cathryn;Whittaker, Philip
地球同步合成孔径雷达（GEO SAR）已经研究了几十年，但尚未实施。本文概述了使命设计，描述了重要的约束条件（大气，轨道，表面和大气的时间稳定性，测量物理和雷达性能），然后使用这些提出了一种方法来初始系统设计。该方法包括迄今提出的所有地球同步轨道合成孔径雷达使命概念。飞行任务的重要分类是：1）需要大气相位补偿以实现其设计空间分辨率的飞行任务;以及2）在没有相位补偿的情况下实现全空间分辨率的飞行任务。估计大气相位屏幕的手段，包括一个新的测量大气相位延迟，GEO SAR使平均变化率。描述了候选使命概念。看来地球同步轨道合成孔径雷达在许多情况下都是可行的，尽管极端天气和不稳定表面（例如，水，高大植被）防止100%覆盖。GEO SAR提供了令人兴奋的成像能力，有力地补充了现有系统。
Geosynchronous synthetic aperture radar (GEO SAR) has been studied for several decades but has not yet been implemented. This paper provides an overview of mission design, describing significant constraints (atmosphere, orbit, temporal stability of the surface and atmosphere, measurement physics, and radar performance) and then uses these to propose an approach to initial system design. The methodology encompasses all GEO SAR mission concepts proposed to date. Important classifications of missions are: 1) those that require atmospheric phase compensation to achieve their design spatial resolution; and 2) those that achieve full spatial resolution without phase compensation. Means of estimating the atmospheric phase screen are noted, including a novel measurement of the mean rate of change of the atmospheric phase delay, which GEO SAR enables. Candidate mission concepts are described. It seems likely that GEO SAR will be feasible in a wide range of situations, although extreme weather and unstable surfaces (e.g., water, tall vegetation) prevent 100% coverage. GEO SAR offers an exciting imaging capability that powerfully complements existing systems.