测绘学报 ›› 2024, Vol. 53 ›› Issue (3): 463-472.doi: 10.11947/j.AGCS.2024.20220657

• 大地测量学与导航 • 上一篇    下一篇

星载分布式SAR双频乒乓模式测高精度分析

王媛1, 徐华平1, 李春升1, 曾国兵1, 刘爱芳2, 葛仕奇2   

  1. 1. 北京航空航天大学电子信息工程学院, 北京 100191;
    2. 南京电子技术研究所, 江苏 南京 211113
  • 收稿日期:2022-11-21 修回日期:2023-09-21 发布日期:2024-04-08
  • 通讯作者: 徐华平 E-mail:xuhuaping@buaa.edu.cn
  • 作者简介:王媛(1997—),女,博士生,研究方向为合成孔径雷达干涉处理。E-mail:wyuan@buaa.edu.cn
  • 基金资助:
    国家自然科学基金(U2241202)

Analysis of interferometric mapping accuracy for spaceborne distributed SAR dual-frequency alternative bistatic mode

WANG Yuan1, XU Huaping1, LI Chunsheng1, ZENG Guobing1, LIU Aifang2, GE Shiqi2   

  1. 1. School of Electronic and Information Engineering, Beihang University, Beijing 100191, China;
    2. Nanjing Research Institute of Electronics Technology, Nanjing 211113, China
  • Received:2022-11-21 Revised:2023-09-21 Published:2024-04-08
  • Supported by:
    The National Natural Science Foundation of China (No. U2241202)

摘要: 星载分布式合成孔径雷达(SAR)系统用于干涉测绘,凭借其基线灵活、时间去相关很小的特点得到了快速发展。与传统模式相比,双频乒乓模式能够同时得到两种频率的多幅SAR图像,可以实现更高精度的高程测量。本文首先简单介绍了双频乒乓模式的工作原理,然后深入研究了该模式下SAR干涉对的相位比例关系和相关性,理论上分析了其干涉相位估计精度和对应的测高精度,从而为系统设计和干涉处理方法研究提供理论依据。最后仿真分析结果直观展示了双频乒乓模式相较于传统模式的优越性,由于该模式增加了不同频率的干涉相位数据,干涉相位估计精度和测高精度均显著提升。

关键词: 星载分布式合成孔径雷达, InSAR, 双频乒乓模式, 测高精度分析

Abstract: Due to flexible baseline and minimal temporal decorrelation, spaceborne distributed synthetic aperture radar (SAR) systems have been rapidly developed and widely applied in interferometric mapping. Dual-frequency alternative bistatic mode is an emerging mode, it can simultaneously acquire multiple SAR images at two frequencies compared with the conventional mode, which enables higher accuracy of interferometric mapping. In this paper, the fundamental of dual-frequency alternative bistatic mode is briefly introduced. Then, the phase ratio relationship and coherence characteristics of SAR interferometric pairs in this mode are investigated in depth, and the interferometric phase accuracy and mapping accuracy are analyzed theoretically, which provides a theoretical basis for the design of the SAR systems and the study of the interferometric processing. Finally, simulation results demonstrate the superiority of the dual-frequency alternative bistatic mode over the conventional mode. This mode can increase the interferometric phase data of different frequencies, thereby improving the accuracy of interferometric mapping.

Key words: spaceborne distributed synthetic aperture radar, InSAR, dual-frequency alternative bistatic mode, interferometric mapping analysis

中图分类号: