FMCW体制毫米波SAR星座未来应用方法初探

Future Application Methods for FMCW Millimeter Wave SAR Constellation

近年来,随着天基遥感应用需求的不断多样化,具备干涉测高、干涉测速等能力的多星合成孔径雷达(SAR)组网系统概念面临工程化实现的难题。为降低组网星座成本和规模,提升工程可实现性,提出了双星调频连续波(FMCW)体制毫米波SAR系统概念,并针对其中星间同步、内定标、星间数据传输等关键问题进行了详解。在双星系统的基础上,设计了多星组网拓展方式,使系统具备了高分宽幅、干涉测高、干涉测速等能力,为未来SAR星座应用方法研究提供参考。

In recent years,with the increasing diversification of application requirements for space-based remote sensing,the concept of multi-satellite synthetic aperture radar(SAR) networking system with capabilities such as interferometric altimetry and interferometric velocity measurement is facing the challenge of engineering realization. In order to reduce the cost and scale of the networking constellation and improve the engineering feasibility,in this paper,the concept of dual-satellite frequency modulated continuous wave(FMCW) millimeter-wave SAR system is proposed. The key issues such as inter-satellite synchronization, internal calibration, and inter-satellite data transmission are discussed in detail. Based on the dual-satellite system,a multi-satellite networking expansion method is designed,which enables the system to have the capabilities such as high-resolution wideband,interferometric altimetry,and interferometric velocity measurement,providing a reference for future research on SAR constellation application methods.