小型陣列式角反射器於合成孔徑雷達邊坡監測之研發測試;Development and Testing of Small Corner Reflector for Synthetic Aperture Radar for Slope Monitoring

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Title:	小型陣列式角反射器於合成孔徑雷達邊坡監測之研發測試;Development and Testing of Small Corner Reflector for Synthetic Aperture Radar for Slope Monitoring
Authors:	林俊成;Lin, Chun-Cheng
Contributors:	土木工程學系
Keywords:	合成孔徑雷達;小型角反射器;角反射器;雷達截面積;InSAR;Small Corner Reflector;CR;Radar Cross Section;RCS
Date:	2022-09-30
Issue Date:	2022-10-04 10:51:25 (UTC+8)
Publisher:	國立中央大學
Abstract:	台灣位於環太平洋地震帶上，地震頻繁且地勢陡峭，所以地質較不穩定，每當豪雨發生時山區時常發生土石鬆動與崩滑之現象，為保護民眾的生命財產安全，必須對山坡地建立一套更詳盡的監測系統。本研究主要探討使用合成孔徑雷達（Synthetic Aperture Radar, SAR）配合小型角反射器(Corner Reflector, CR)於邊坡穩定之應用。本研究設計一小型CR，使其體積小、重量輕及裝設容易，以提供更可靠之SAR反射點。本研究透過基礎雷達截面積（Radar Cross-Section）原理，設計小型CR之外型及大小，可改變CR之最大RCS及最大反射角度；因小型CR的訊號較小，本研究以陣列式裝設來增加反射強度。為驗證其可行性，先於多重物理有限元素模型軟體中進行模擬可行性，後續再透過地基合成孔徑雷達（Grand-Base Synthetic Aperture Radar, GB-SAR）進行現地試驗。其成果顯示，NCU現地測試時所量測到的RCS數值為24.29 dBsm，與預期的陣列式CR的25.18 dBsm相近，皆比單一CR的10 dBsm高，可顯示出在增加CR的數量來增強反射量是可行的。小型CR較為容易攜帶及安裝，但仍有反射量增加幅度小與雷達干涉問題，因此本研究透過專業RCS模擬方式進行驗證，雖然在陣列式CR中會產生不規則的散射現象，但大致上與本研究自行提出之理論預測成果是相符的，且本研究提出不同CR排列下之影響干擾。目前將於秀巒崩塌地進行陣列式CR裝設與監測，對該地區進行雷達反射量分析可確認在裝設區中大部分之區域皆為黑色區域，現已將CR部署在該地區中，以對後續試驗做測試規劃。;Taiwan is located in the Pacific Rim seismic zone, where earthquakes are frequent, and the terrain is steep, so the geology is relatively unstable. This study focuses on using Synthetic Aperture Radar (SAR) with a small Corner Reflector (CR) for slope stabilization. In this study, a small CR with lightweight and easy installation is designed to provide more reliable SAR reflected scatters. The CR′s maximum RCS and maximum reflection angle can be changed by designing the compact CR′s external shape and size based on the Radar Cross-Section principle. In order to verify the feasibility, we first simulated the feasibility in the multiphysics finite element software. We then conducted the field test by the Grand-Base Synthetic Aperture Radar (GB-SAR). Based on the present results, the measured RCS value of 24.29 dBsm in the field test at NCU is similar to the expected 25.18 dBsm for the array CR. The RCS value is 10 dBsm higher than a single CR, indicating that it is feasible to increase the number of CRs to enhance the reflection amount. Although irregular scattering phenomena will occur in the array CR, it is generally consistent with the theoretical prediction results proposed by this study, and this study has examined the influence of interference under different CR arrangements with RCS radar simulation software. Currently, an array CR will be installed and monitored at the Xiulan collapse site, and radar reflectance analysis of the area confirms that most of the area in the installation zone is black. The CR has been deployed in the area for test planning for subsequent tests.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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