| GEO SAR中精确的面目标回波仿真方法 |
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| 引用本文： | 常法光,李德鑫,董臻.GEO SAR中精确的面目标回波仿真方法[J].信号处理,2022,38(6):1249-1258. |
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| 作者姓名： | 常法光 李德鑫 董臻 |
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| 作者单位： | 国防科技大学电子科学学院，湖南 长沙 410073 |
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| 基金项目： | 国家自然科学基金61771478 |
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| 摘 要： | 地球同步轨道合成孔径雷达（Geosynchronous synthetic aperture radar，GEO SAR）具有重返周期短、驻留时间长、观测范围广等优点，在陆地测绘与自然灾害检测等方面有巨大的应用价值，吸引了众多国内外研究学者的兴趣。现在尚未有可用的GEO SAR实测数据，许多提出的成像算法都是以点目标作为验证对象，而在面目标中未必有很好的适用性，并且在将来的观测场景中，研究对象都是面目标。因此，在GEO SAR系统下对于面目标的回波进行仿真，显得很有必要。以点目标回波仿真形式作为基 础，针对GEO SAR中数据量大、仿真效率低这一问题，本文提出一种通过插值快速构造场景的方法，并且在回波仿真中考虑了“停-走-停”误差以及方位向窗函数准确设计这两个问题，以确保回波仿真贴切实际情况。还提出两种目标散射强度设计方法，最后通过成像验证回波仿真的正确性。
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| 关 键 词： | 地球同步轨道合成孔径雷达 插值 回波仿真 面目标 仿真效率 |
| 收稿时间： | 2021-09-28 |
Fast Distributed Target Echo Simulation Method in GEO SAR |
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| Affiliation: | College of Electronic Science and Technology，National University of Defense Technology，Changsha，Hunan 410073，China |
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| Abstract: | ? ?Geosynchronous synthetic aperture radar （GEO SAR） has the advantages of short revisit cycle， long dwell time and wide observation swath. It has great application value in vegetation measurements and natural disaster detection and has attracted the interest of many national researchers. At present， there is no available measured data of GEO SAR， and many of the proposed imaging algorithms take point target as the verification object， but they may not be applicable to distributed target. And in future observation scenes， they are all distributed targets. Therefore， it is necessary to simulate echo of distributed target in GEO SAR system. In the form of point target echo simulation as the foundation， in view of the problem of large amount of data and low simulation efficiency in GEO SAR， this paper proposes a fast construction scene by interpolation method， and the stop-go-stop error and azimuth window function design are considered in the echo simulation， to ensure that the echo simulation is accurate to the actual situation. Two methods of target scattering intensity design are proposed. Finally， the accuracy of echo simulation is verified by imaging. |
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