一种高轨SAR带宽与合成孔径时间的设计方法

doi:10.3969/j.issn.1001-2400.2017.05.010

西安电子科技大学学报

一种高轨SAR带宽与合成孔径时间的设计方法

刘文康1,2;孙光才1,2;陈溅来1,2;邢孟道1,2

(1. 西安电子科技大学雷达信号处理国家重点实验室，陕西西安 710071；
2. 西安电子科技大学信息感知技术协同创新中心，陕西西安 710071)

收稿日期:2016-09-21 出版日期:2017-10-20 发布日期:2017-11-29
通讯作者: 孙光才(1984-)，男，副教授，E-mail: gcsun@xidian.edu.cn
作者简介:刘文康(1993-)，男，西安电子科技大学博士研究生，E-mail: wkliu@stu.xidian.edu.cn．
基金资助:
国家自然科学基金创新群体资助项目(61621005)

Design method for bandwidth and synthetic aperture time in GEOSAR

LIU Wenkang1,2;SUN Guangcai1,2;CHEN Jianlai1,2;XING Mengdao1,2

(1. National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071, China;
2. Collaborative Innovation Center of Information Sensing and Understanding, Xidian Univ., Xi'an 710071, China)

Received:2016-09-21 Online:2017-10-20 Published:2017-11-29

摘要/Abstract

摘要：

高轨合成孔径雷达星地构型几何复杂，低轨合成孔径雷达系统设计中距离方位不耦合的假设不再成立，常规的带宽和合成孔径时间设计方法在高轨中不再适用．针对上述问题，提出了一种适用于高轨的系统带宽与合成孔径时间优化设计方法．首先根据高轨合成孔径雷达斜距平面与地距平面的几何映射关系，得到了解析的地表分辨率表示方法；然后针对实际应用对合成孔径雷达地表分辨率大小和形状(尽量接近圆)的要求，提出了一种信号带宽与合成孔径时间优化设计方法；最后以高轨椭圆轨道为例，给出了设计实例，分辨率分析结果与后向投影法成像结果吻合，同时给出了相应的带宽与合成孔径时间设计结果．仿真结果验证了文中方法在高轨合成孔径雷达系统设计中的有效性．

关键词: 高轨合成孔径雷达, 信号带宽, 合成孔径时间, 分辨率椭圆, 模糊函数

Abstract:

The complex relative motions between the Radar platform and the targets are more complex in geosynchronous Synthetic aperture radar (GEO SAR). The assumption that range and azimuth are uncoupled in Low-Earth-Orbit SAR does not hold in GEO SAR. The common calculation method for bandwidth and synthetic aperture time cannot be used in GEO SAR. In this paper, a method suit able for GEO SAR is proposed to design imaging parameters including the bandwidth and synthetic aperture time. First, a resolution analysis method with analytical expression is deduced based on geometrical mapping, and then based this expression, the bandwidth and the synthetic aperture time are optimized to meet the resolution's needs on value and shape (close to a circle). Finally, a design example in a GEO ellipse orbit is given, and the resolution analysis result corresponds to the image obtained by the Back Projection (BP) method. The designed bandwidth and synthetic aperture time are also provided. Simulation results validate the effectiveness of the proposed method in the GEO SAR system design.

Key words: GEO SAR, signal bandwidth, synthetic aperture time, resolution ellipse, ambiguity function (AF)

刘文康;孙光才;陈溅来;邢孟道. 一种高轨SAR带宽与合成孔径时间的设计方法[J]. 西安电子科技大学学报, 2017, 44(5): 58-63.

LIU Wenkang;SUN Guangcai;CHEN Jianlai;XING Mengdao. Design method for bandwidth and synthetic aperture time in GEOSAR[J]. Journal of Xidian University, 2017, 44(5): 58-63.

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一种高轨SAR带宽与合成孔径时间的设计方法

Design method for bandwidth and synthetic aperture time in GEOSAR

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