中国空间科学技术

中国空间科学技术 ›› 2023, Vol. 43 ›› Issue (5): 132-137.doi: 10.16708/j.cnki.1000-758X.2023.0077

• 论文 • 上一篇    

基于帧频的星载SAR系统视频成像能力分析

易天柱，康利鸿，余晓刚，孙希龙，左斌，张越，曾理弌   

  1. 北京市遥感信息研究所，北京100192
  • 出版日期:2023-10-25 发布日期:2023-09-12

Analysis of space-borne SAR system video imaging capacity model based on frame rate

YI Tianzhu，KANG Lihong，YU Xiaogang，SUN Xilong，ZUO Bin，ZHANG Yue，ZENG Liyi   

  1. China Beijing Institute of Remote Sensing Information，Beijing，100192，China
  • Published:2023-10-25 Online:2023-09-12

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摘要： 视频合成孔径雷达（video synthetic aperture radar，ViSAR）作为一种微波遥感体制能以摄像式模式对重点区域的时敏目标展开持续性的动态监视，已经受到越来越广泛的关注，但针对视频SAR系统的视频成像能力的分析还不够深入。首先建立了视频SAR回波信号模型，并结合给定的星载SAR系统参数，提出了一种基于帧频的适合分析星载SAR系统视频成像能力的模型，并基于X波段和Ka波段雷达参数对系统进行了仿真分析。研究表明，在形成相同帧率的SAR视频时，SAR系统频率越高，越容易形成独立帧率的SAR视频；在形成相同方位分辨率帧图像的SAR视频时，中心斜视角越大，所需的孔径交叠率越大。研究成果可为星载SAR系统设计提供理论分析支撑。

关键词: 视频合成孔径雷达, 星载SAR系统, 时敏目标, 动态监视, 视频成像

Abstract:  ViSAR（video synthetic aperture radar），as a microwave remote sensing system，which can continuously monitor time-sensitive targets in the significant region in camera mode，has attracted more and more attention，but the analysis of video imaging capability of video SAR system is not thorough enough.Based on the SAR echo and the system parameters，a space-borne ViSAR imaging capacity model was presented，which can be used in the analysis of space-borne SAR potential application of video imaging.The X-band and Ka-band ViSAR parameters were used to simulate the SAR system video imaging capacity.With the same frame rate of ViSAR，the higher the frequency of the ViSAR system，the easier it is to form a SAR video with an independent frame rate；with the same azimuth resolution of ViSAR system，the larger the central squint angle，the greater the required ratio of the ViSAR overlapped sub-aperture.The research can support spaceborne ViSAR system design theoretically.

Key words: video synthetic aperture radar, space-borne SAR system, time-sensitive target, continued monitor, video imaging