MIMO技术在航天遥感中的应用

Wenqin Wang
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引用次数: 30

摘要

受多输入多输出(MIMO)雷达最新进展的启发,本文介绍了MIMO合成孔径雷达(SAR)的概念。这一概念与目前使用紧密间隔天线阵列的sar有很大不同。利用紧密间隔的天线单元,可以使波束向空间某一方向相干,从而实现相干处理增益。然而,这些系统容易出现严重的目标衰落,因此它们可能遭受相当大的性能下降。MIMO SAR与其他SAR的根本区别在于后者寻求最大化相干处理增益,而MIMO SAR利用目标散射的多样性来提高雷达性能。研究了MIMO SAR在高分辨率、高灵敏度、抗目标波动等方面相对于传统SAR的优越性。研究表明,MIMO SAR的使用带来了以前遥感科学家和客户认为遥不可及的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Applications of MIMO Technique for Aerospace Remote Sensing
Inspired by recent advances in multiple-input multiple-output (MIMO) radar, this paper introduces the MIMO synthetic aperture radar (SAR) concept. This concept differs substantially from current SARs in which closely spaced antenna arrays are used. With closely spaced antenna elements, it is possible to coherent a beam toward a direction in space and to realize a coherent processing gain. However, these systems are prone to severe target fading, and hence they may suffer considerable performance degradation. The fundamental difference between MIMO SAR and other SAR is that the latter seek to maximize the coherent processing gain, while MIMO SAR capitalizes on the diversity of target scattering to improve radar performance. The superiority of MIMO SAR in many aspects over the conventional SAR, e.g., high resolution, good sensitivity, and countermining target fluctuations is investigated. It is shown that, the use of MIMO SAR leads to solutions that previously thought to be out of reach for remote sensing scientists and customers.
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