ASTC-MIMO-TOPS Mode with Digital Beam-Forming in Elevation for High-Resolution Wide-Swath Imaging

ASTC-MIMO-TOPS Mode with Digital Beam-Forming in Elevation for High-Resolution Wide-Swath Imaging
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ASTC-MIMO-TOPS 模式在仰角进行数字波束形成,实现高分辨率宽测绘带成像

DOI:
10.3390/rs70302952
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发表时间:
2015-03
期刊:
影响因子:
5
通讯作者:
Wei Xu
Wei Xu
中科院分区:
工程技术2区
文献类型:
--
作者:
Pingping Huang;Wei Xu

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未来的星载合成孔径雷达(SAR)任务需要以高分辨率完整、频繁地覆盖地球。逐行扫描地形观测 (TOPS) 是一种新颖的宽测绘带模式,但方位分辨率较差。本文提出了一种创新的扩展TOPS模式——Alamouti空时编码多输入多输出TOPS(ASTC-MIMO-TOPS)模式,结合仰角数字波束形成(DBF)和方位角多孔径SAR信号重建。这种创新模式实现了高几何分辨率的宽测绘带覆盖,并克服了传统 MIMO SAR 系统的主要缺点。详细介绍了该成像方案的数据处理方案。给出了所提出的ASTC-MIMO-TOPS模式的设计系统示例,该模式具有400 km宽测绘带的成像能力,方位角分辨率为3 m。其系统性能分析结果和对点目标的模拟成像结果证明了所提出的新型星载SAR模式在高分辨率宽测绘带(HRWS)成像方面的潜力。
Future spaceborne synthetic aperture radar (SAR) missions require complete and frequent coverage of the earth with a high resolution. Terrain Observation by Progressive Scans (TOPS) is a novel wide swath mode but has impaired azimuth resolution. In this paper, an innovative extended TOPS mode named Alamouti Space-time Coding multiple-input multiple-output TOPS (ASTC-MIMO-TOPS) mode combined with digital beam-forming (DBF) in elevation and multi-aperture SAR signal reconstruction in azimuth is proposed. This innovative mode achieves wide-swath coverage with a high geometric resolution and also overcomes major drawbacks in conventional MIMO SAR systems. The data processing scheme of this imaging scheme is presented in detail. The designed system example of the proposed ASTC-MIMO-TOPS mode, which has the imaging capacity of a 400 km wide swath with an azimuth resolution of 3 m, is given. Its system performance analysis results and simulated imaging results on point targets demonstrate the potential of the proposed novel spaceborne SAR mode for high-resolution wide-swath (HRWS) imaging.
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