未来星载SAR技术发展趋势

星载合成孔径雷达(SAR)以卫星等空间飞行器为运动平台，具有全天时、全天候、全球观测能力，已成为一种不可或缺的对地观测手段。当前，我国星载SAR已实现分辨率从米级到亚米级、系统体制从正侧视条带向方位扫描聚束、从单通道向多通道、极化方式从单一极化到全极化的技术跨越。随着技术的不断进步，未来星载SAR将在体制、概念、技术、模式等方面取得突破，包括高分辨率宽幅成像、多基地、轻小型化、智能化等，从而不断拓展星载SAR的观测维度，实现多维度信息获取。该文将围绕星载SAR的技术发展趋势展开论述。 

Forthcoming Spaceborne SAR Development

Spaceborne Synthetic Aperture Radar(SAR),which can be mounted on space vehicles to collect information of the entire planet with all-day and all-weather imaging capacity,has been an indispensable device for earth observation.Currently,the technology of our spaceborne SAR has achieved a considerable technological improvement,including the resolution change from meter to submeter,the imaging mode from stripmap to azimuth beam steering like the sliding spotlight,the practical application of the multichannel approach and the conversion of single polarization into full polarization.With the development of SAR techniques,forthcoming SAR will make breakthroughs in SAR architectures,concepts,technologies and modes,for example,high-resolution wide-swath imaging,multistatic SAR,payload miniaturization and intelligence.All of these will extend the observation dimensions and obtain multidimensional data.This study focuses on the forthcoming development of spaceborne SAR.