机载同时同频MIMO-SAR系统研究概述

Research Outline of Airborne MIMO-SAR System with Same Time-frequency Coverage

针对传统合成孔径雷达(SAR)体制带来的模式单一、核心指标已接近极限等瓶颈问题,近年来提出了一种新体制多输入多输出合成孔径雷达(MIMO-SAR)。该雷达系统通过更多的收发阵元获得更为丰富的系统自由度,并以此突破传统SAR体制限制,实现高分辨率宽测绘带跨越发展和多模式协同。该文深度剖析了MIMO-SAR概念内涵与技术特点,概括了国内外研究现状与技术发展趋势,总结归纳了国际首部同时同频MIMO-SAR研制经验与飞行试验结果,并展望分析了MIMO SAR应用前景,以期为我国未来SAR技术奠定基础。

To solve the bottlenecks associated with traditional Synthetic Aperture Radar（SAR） systems related to the limitations of single working models and core indexes, a new system known as Multi-Input Multi-Output（MIMO） SAR was recently proposed. This novel radar system obtains greater freedom by the use of more equivalent transceivers. As such, it is not constrained by the limitations of traditional SAR systems and can achieve high-resolution wide-swath imaging and mean-time multi-mode operation. In this paper, we analyze the connotations and characteristics of MIMO-SAR in depth, and summarize the current research situation and future development trends. To lay a foundation for China＇s future SAR technology, we have also developed the first MIMO-SAR prototype with the same time-frequency coverage. We summarize the key technologies and flight results and analyze the prospects for MIMO-SAR applications.