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    北理工在基于導航衛星的干涉合成孔徑雷達形變反演技術取得最新研究成果

      北理工信息與電子學院毛二可院士、龍騰教授創新團隊的最新研究成果《基于導航衛星的干涉合成孔徑雷達三維形變反演:算法與可行性研究》(GNSS-Based SAR Interferometry for 3-D Deformation Retrieval: Algorithms and Feasibility Study),發表于本領域國際頂級期刊《IEEE Transactions on Geoscience and Remote Sensing》(IEEETGRS)上。本文的第一作者為北理工信息與電子學院劉飛峰副教授,通訊作者為劉泉華副教授。

    圖1 系統拓撲構型圖

      基于導航衛星的干涉合成孔徑雷達形變反演技術(圖1)具有時空雙連續監測、精度高等優勢,且成本低,在山體滑坡、地表沉降等地災監測中應用前景廣泛。

    圖2 某高鐵橋區域雷達圖像

      在前期的研究成果中,研究團隊已解決了系統成像問題(圖2),但在三維形變高精度反演、精度評估模型等方面存在理論和算法上的難點問題需要解決。本研究中,研究團隊通過引入雙基地永久散射點(PS點)技術,針對性的提出多維PS點關聯處理思路,融合多星觀測數據,解決了三維形變高精度反演問題。進一步,通過拓展傳統導航定位精度幾何散度因子模型(GDOP),建立了面向基于導航衛星的干涉合成孔徑雷達形變反演的新的擴展GDOP模型,解決了該技術的三維形變測量精度準確評估的問題。

    圖3 強點三維形變測量曲線

      進一步基于轉發器的實測三維形變曲線與真實形變曲線一致(圖3),驗證了所提算法的有效性,實測三維形變精度達到毫米量級,與理論預期吻合。

      該項研究成果獲得IEEE地球科學與遙感協會(GRSS)會刊年度杰出論文獎(TPPA: Transactions Prize Paper Award),為該項技術走向實際應用奠定了技術基礎,也為地災監測領域提供了新思路和新技術。

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