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Research on dense observing network of precipitable water by using on-vehicle low-cost GNSS receiver systems

Research Project

Project/Area Number 20K21847
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 63:Environmental analyses and evaluation and related fields
Research InstitutionYamaguchi University

Principal Investigator

Imaoka Keiji  山口大学, 大学研究推進機構, 准教授 (50725869)

Project Period (FY) 2020-07-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2020: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsGNSS / 水蒸気 / 可降水量 / 低コスト / 移動体
Outline of Research at the Start

豪雨の早期検知などの観点から、高頻度・高密度の水蒸気観測が必要とされている。車載型の低コスト全球測位衛星システム(GNSS)受信機により精度良く水蒸気を計測することができれば、高密度の水蒸気観測網を構築できる可能性がある。本研究では、1・2周波の低コストGNSS受信機を用いた水蒸気計測システムを構築し、固定点において天頂大気遅延量と水蒸気量の精度評価を行うとともに、車載状態での位置・姿勢安定性や受信状態などの影響を評価する。これにより、将来の高頻度・高密度水蒸気観測システムの可能性を明らかにする。

Outline of Final Research Achievements

Observations of water vapor with high temporal frequency and high area density are desired for many purposes including early detection of severe rainstorms. To reduce the cost for installation, utilizing low-cost GNSS receivers is highly expected. In this research, for the purpose of establishing dense water vapor observation network by using on-vehicle low-cost GNSS receivers, we constructed the observing system with two-frequency low-cost GNSS receiver and evaluated the estimation performance of water vapor by comparing with geodetic-grade GNSS receiver system and radiosonde observations. As a result, low-cost GNSS receiver system exhibited comparable performance with that by geodetic-grade system in estimating water vapor. Although we were not able to show reasonable performance for on-vehicle experiment, at least low-cost GNSS receivers are promising in constructing denser observing network of water vapor with fixed stations.

Academic Significance and Societal Importance of the Research Achievements

平成30年7月豪雨における線状降水帯に伴う大雨や大型台風の上陸頻度増加など,地球温暖化の影響と考えられる極端な気象現象の頻発が近年問題となっている.このような風水害に備えるためにはその兆候をいち早く把握し,対応のリードタイムを確保することが重要である.本研究成果は,降水に先行する水蒸気の挙動の高頻度・高密度な観測網の構築に資するもので,防災の観点から社会的意義を有する.また,近年市場に展開されている低コストGNSS受信機による水蒸気観測の精度を,ラジオゾンデ観測との長期比較により初めて直接的に検証した点に学術的意義がある.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2022 2021

All Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] 低コストGNSS受信機システムによる可降水量推定精度検証2022

    • Author(s)
      竹田大騎,今岡啓治,新銀秀徳,小河原加久治
    • Organizer
      測位航法学会GPS/GNSSシンポジウム2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] Validation of precipitable water estimated by using cost-effective GNSS receiver system2022

    • Author(s)
      T. Takeda, K. Imaoka, H. Shingin, and K. Ogawara
    • Organizer
      The 43rd Asian Conference on Remote Sensing
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 低コストGNSS受信機システムによる天頂大気遅延量の推定性能2021

    • Author(s)
      今岡啓治,乗富隆
    • Organizer
      日本リモートセンシング学会第71回(令和3 年度秋季)学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Validation of precipitable water estimates derived by a cost-effective dual-frequency GNSS receiver system2021

    • Author(s)
      R. Noritomi, K. Imaoka, H. Shingin, and K. Ogawara
    • Organizer
      The 42nd Asian Conference on Remote Sensing
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2020-08-03   Modified: 2024-01-30  

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