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WANG Yidi, WANG Robert, ZHANG Yunjun, et al. The concept and system of very large baseline spaceborne interferometric synthetic aperture radar[J]. Journal of Radars, 2026, 15(1): 1–24. doi: 10.12000/JR25220
Citation: WANG Yidi, WANG Robert, ZHANG Yunjun, et al. The concept and system of very large baseline spaceborne interferometric synthetic aperture radar[J]. Journal of Radars, 2026, 15(1): 1–24. doi: 10.12000/JR25220
shu

The Concept and System of Very Large Baseline Spaceborne Interferometric Synthetic Aperture Radar

DOI: 10.12000/JR25220 CSTR: 32380.14.J25220
  • 1.

    National Key Laboratory of Microwave Imaging, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China

  • 2.

    School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Funds:  The National Natural Science Foundation of China (62495030, 62421001)
More Information
  • Corresponding author: WANG Robert, yuwang@mail.ie.ac.cn
  • Received Date: 2025-11-03
  • Rev Recd Date: 2026-01-01
    • Available Online: 2026-01-07
    Abstract
  • Spaceborne Interferometric Synthetic Aperture Radar (InSAR) enables surface elevation measurement and deformation monitoring by measuring phase differences along the radar line of sight. However, meeting the future demand for higher-precision measurements remains challenging: analytical models linking InSAR system design parameters to measurement accuracy are still limited by incomplete key parameters and insufficient or unclear physical constraints. These limitations restrict the development of next-generation InSAR technology. This study examines the complex multifactor coupling between system design parameters and measurement accuracy. It provides a detailed analysis of the imaging mechanism and theoretical constraints of spaceborne InSAR with spatial and temporal baselines and presents a spatiotemporal error model integrating multisource decorrelation. The nonlinear relationship between baseline parameters and measurement accuracy is quantitatively characterized, and a comprehensive evaluation framework is established based on key indicators such as coherence, elevation accuracy, and coherent temporal baseline-based deformation sensitivity. Built on top of these analysis, the concept and system architecture of very large baseline spaceborne InSAR are proposed, and its performance is analyzed in detail. The associated technical challenges—including orbit configuration, system design, synchronization, error correction, and phase unwrapping—are systematically discussed. Potential applications of this type of InSAR system architecture in high-precision elevation, deformation measurements, and distributed SAR systems are introduced. The proposed framework provides theoretical support for the design of next-generation high-precision, multidimensional InSAR systems and is expected to play a key role in the frontier of Earth science exploration and the safety assurance of major national engineering projects.

     

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      沈阳化工大学材料科学与工程学院 沈阳 110142

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