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Development of a advanced InSAR atmospheric correction method by fusing GNSS observation and numerical atmospheric modeling

Research Project

Project/Area Number 21K14006
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionUniversity of Tsukuba

Principal Investigator

Kinoshita Yohei  筑波大学, システム情報系, 助教 (90750703)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsInSAR / 大気伝搬遅延 / GNSS / 数値気象モデル / 高精度化 / 大気遅延 / 全球大気モデル / 大気伝搬遅延効果 / 大気遅延誤差
Outline of Research at the Start

【背景】合成開口レーダー干渉法 (InSAR) による面的地表変動観測は, 地球大気の影響によって観測精度が制限されている. InSAR大気ノイズの補正手法確立が要請されている.
【目的】本研究は先進的なInSAR大気ノイズ補正手法を開発することでInSAR高精度化を実現し, また誰もが利用可能にするためのWebシステムを構築する.
【展開】具体的な研究項目は, GNSSに基づくInSAR大気ノイズ補正新手法の開発, 開発した補正手法と数値気象モデルとの融合, およびWeb計算システムの構築, の3つである. 本研究により高精度なInSAR地表変動観測を実現・普及できることが期待できる.

Outline of Final Research Achievements

Synthetic aperture radar interferometry (InSAR), which can detect surface displacement distribution with centimeter to millimeter accuracy, often suffer from the existence of Earth's atmosphere through the microwave propagation delay effect, resulting in the limitation of InSAR observation accuracy.In this study I developed a new correction method for InSAR atmospheric delay noise using GNSS atmospheric observatioin information. The developed model showed higher effectiveness than traditional delay correction methods. Moreover, to improve the applicability of the developed model, I incorpolated a global atmospheric model ERA5 into the developed model (I call it as the hybrid correction model). The hybrid correction model showed same noise reducibility as the GNSS-based developed model, although the hybrid correction model can be applied everywhere even if there are no GNSS stations.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発したInSAR大気ノイズ補正手法は従来の補正手法を上回る補正効果を示しており、これによりこれまで観測精度の制約により検出されなかった微小地表面変位シグナルの検出を実現できる可能性がある。具体例として、スロー地震現象の一つであるスロースリップイベント(SSE)、年間ミリメートル程度の変位量を持つ非地震性の活断層運動、変位分布が地形と相関することの多い山体での火山活動などにおいて、未発見の地表面変位シグナル検出に貢献できる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (14 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Journal Article] Development of InSAR Neutral Atmospheric Delay Correction Model by Use of GNSS ZTD and Its Horizontal Gradient2022

    • Author(s)
      Kinoshita Yohei
    • Journal Title

      IEEE Transactions on Geoscience and Remote Sensing

      Volume: 60 Pages: 1-14

    • DOI

      10.1109/tgrs.2022.3188988

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] GNSSと全球大気モデルを融合したInSAR大気遅延補正モデルの開発についての進捗2023

    • Author(s)
      木下 陽平
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] GNSSと全球大気モデルを融合したInSAR大気遅延補正モデルの開発についての進捗2023

    • Author(s)
      木下 陽平
    • Organizer
      GNSSと全球大気モデルを融合したInSAR大気補正モデルの開発進捗
    • Related Report
      2023 Annual Research Report
  • [Presentation] GNSSを用いたInSAR大気遅延補正モデルの開発2023

    • Author(s)
      木下 陽平, 下妻 康平
    • Organizer
      日本リモートセンシング学会第75回(令和5年度秋季)学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Assessing the performance of a hybrid InSAR atmospheric delay model combined with GNSS and ERA5 global atmospheric model2023

    • Author(s)
      Yohei Kinoshita
    • Organizer
      AGU 2023 Annual meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] GNSSと全球大気モデルを融合したInSAR大気遅延補正モデルの開発についての進捗2023

    • Author(s)
      木下陽平
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 全球大気再解析ERA5とGNSSを用いたハイブリッドInSAR大気遅延補正モデル開発の試み2022

    • Author(s)
      木下陽平
    • Organizer
      日本測地学会第138回講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Incorporating global atmospheric model products into the InSAR atmospheric delay model based on GNSS observations2022

    • Author(s)
      Yohei Kinoshita
    • Organizer
      AGU Fall Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Developing InSAR atmospheric delay correction model based on GEONET ZTD and its gradient2021

    • Author(s)
      Yohei Kinoshita
    • Organizer
      EGU General Assembly 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] GNSSを用いたInSAR大気遅延補正モデル開発の進捗2021

    • Author(s)
      木下陽平
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Developing InSAR Atmospheric Delay Correction Model Based on GEONET ZTD and Its Gradient2021

    • Author(s)
      Yohei Kinoshita
    • Organizer
      Fringe 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Atmospheric noise mitigation in SAR interferometry: current state of progress2021

    • Author(s)
      Yohei Kinoshita
    • Organizer
      SEGJ 14th symposium
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Developing InSAR atmospheric delay model by combining GNSS ZTD with ZTD gradient and numerical weather model2021

    • Author(s)
      Yohei Kinoshita
    • Organizer
      The Joint PI Meeting of JAXA Earth Observation Missions FY2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] GNSS と数値気象モデルの水平風データを融合した InSAR 大気遅延モデルの開発2021

    • Author(s)
      木下陽平
    • Organizer
      日本測地学会第136回講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Progress of developing InSAR atmospheric delay correction model based on GNSS ZTD and Its gradient2021

    • Author(s)
      Yohei Kinoshita
    • Organizer
      AGU fall meeting 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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