基于多频子脉冲的中轨星载高分宽幅SAR系统设计方法  

Design Method for MEO-HRWS-SAR System Based on MFSPs

作　　者：沈义龙 汤楚蘅 陆晴 张双喜 SHEN Yilong;TANG Chuheng;LU Qing;ZHANG Shuangxi(School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710129,Shaanxi,China;Luoyang Electronic Equipment Test Center of China,Luoyang 471003,Henan,China;Shanghai Institute of Satellite Engineering,Shanghai 201109,China)

机构地区：[1]西北工业大学电子信息学院,陕西西安710129 [2]中国洛阳电子信息装备试验中心,河南洛阳471003 [3]上海航天电子技术研究所,上海201109

出　　处：《上海航天（中英文）》2024年第4期67-75,共9页Aerospace Shanghai（Chinese&English）

基　　金：上海航天科技创新基金(SAST2021-042、SAST2022-045);国家自然科学基金(62271406)。

摘　　要：基于多频子脉冲(MFSP)的中轨(MEO)高分宽幅(HRWS)合成孔径雷达(SAR)系统设计过程中面临着全球覆盖、下视可见性、距离方位二维解模糊、系统复杂度优化等一系列问题,提出了从轨道到架构再到参数的3层设计思想,利用空间、时间、频率等多个维度进行二维模糊抑制与系统优化,采用典型低轨(LEO)SAR系统作为参照系统,完成了MEO星载HRWS SAR的系统设计,在中轨平台上实现了HRWS SAR成像,且较大地提高了星载平台对地观测的时间分辨率,最后通过仿真验证了设计方法的有效性,具有一定的工程应用价值。In the process of designing the medium Earth orbit(MEO)spaceborne high resolution and wide swath(HRWS)synthetic aperture radar(SAR)(MEO-HRWS-SAR)system based on multiple frequency sub-pulses(MFSPs),there are a series of problems such as global coverage,low visibility,two-dimensional(2D)defuzzification along the distance azimuth,and system complexity optimization.In this paper,a three-layer design idea,i.e.,orbit,architecture,and then parameters,is proposed.The two-dimensional fuzzy suppression and system optimization are carried out with space,time,frequency,etc.The typical low Earth orbit(LEO)SAR system is used as the reference system to complete the design of MEO-HRWS-SAR system,and the HRWS SAR imaging is realized on the MEO platform.In addition,the temporal resolution of Earth observation on the spaceborne platform is greatly improved.Finally,the validity of the design method is verified by simulation.The proposed design method has certain engineering application value.

关 键 词：轨道设计 架构设计 参数设计 下视可见性 二维解模糊 全球覆盖 

分 类 号：TN911.73[电子电信—通信与信息系统] TP391.9[电子电信—信息与通信工程]