应用多普勒牵引的高分辨率星载SAR滑动聚束模式设计方法  

Design Method of High Resolution Spaceborne SAR Sliding Spotlight Mode Using Doppler Steering

作　　者：郝梁 肖枫[2] 张润宁[1] 程博文[1] 禹霁阳[1] HAO Liang;XIAO Feng;ZHANG Running;CHENG Bowen;YU Jiyang(Beijing Institute of Spacecraft System Engineering,Beijing 100094,China;Beijing Institute of Technology,Beiing 100081,China)

机构地区：[1]北京空间飞行器总体设计部,北京100094 [2]北京理工大学,北京100081

出　　处：《航天器工程》2020年第2期23-29,共7页Spacecraft Engineering

基　　金：国家重大科技专项工程。

摘　　要：高分辨率星载合成孔径雷达(SAR)通常采用滑动聚束模式完成成像任务,当分辨率提高到一定程度后,卫星轨道弯曲问题无法忽略,因此需要与之相适应的模式设计方法。为此,文章提出一种应用多普勒牵引的滑动聚束模式设计方法,通过姿态校正的方式保证在合成孔径时间内多普勒中心呈线性分布,使回波可以利用传统的非线性调频变标(NCS)算法完成成像。利用STK和Matlab软件的联合仿真平台,通过建模及仿真成像的方式对设计方法进行验证,结果表明:该设计方法在降低工程实现复杂度和图像后处理的难度上都具有很大的优势,可为我国高分辨星载SAR成像模式设计提供参考。High resolution spaceborne SAR usually uses sliding spotlight mode to complete imaging task. When the resolution is improved to a certain extent, the problem of satellite orbit bending cannot be ignored, therefore the mode design should be adapted accordingly. In this paper, a design method of sliding spotlight mode using Doppler steering is proposed. The Doppler center is guaranteed to be linearly distributed in the synthetic aperture time by attitude calibration, so that the echo can be imaged by traditional NCS algorithm. Using STK and Matlab joint simulation platform, the effectiveness of the proposed method is verified by modeling, simulation and imaging. The results show that it has great advantages in reducing the complexity of engineering implementation and the difficulty of image post-processing, and can provide reference for the design of high-resolution spaceborne SAR imaging mode.

关 键 词：星载合成孔径雷达 高分辨率 姿态控制 多普勒牵引 

分 类 号：TN958[电子电信—信号与信息处理]