應用合成口徑雷達干涉量測技術偵測大地微量變化

Use of Synthetic Aperture Radar Interferometry for Land Surface Deformation Detection

陳大科(Ta-Ko Chen) ； 吳啓南(Chi-Nan Wu)

《地工技術》 69期 (1998/10) Pp. 25-32

https://doi.org/10.30140/SG.199810.0003

摘要

重覆軌道的衛星合成口徑雷達（SAR）影像若具有穩定的軌道基線長與高空間解像力，可用於微量地表形變之偵測。本文利用SAR相位差理論所建立之干涉量測技術（INSAR）研究探討量測地層下陷之能力。本文以四幅1993年及1996年間高屏地區重覆軌道之ERS-1/2衛星合成口徑雷達複數影像來研究偵測公分級地層變形量，經資料格式轉換、影像對位、干涉條紋圖產生、軌道基線長計算、地球曲率效應移除、基線長微調、相位還原及數值高程模型產生等影像處理後，以差分干涉量測技術，建立殘餘干涉條紋圖與地層變形量間之關係。最後再評估INSAR技術於量測台灣地層形變量之可行性。

關鍵字

合成口徑雷達干涉量測 ； 大地地表變形 ； 干涉條紋圖

並列摘要

Repeat-pass satellite synthetic aperture radar (SAR) images having stable orbit baseline and high spatial resolution are good for the detection of surface deformation. The ability of measuring land subsidence is studied by using differential intreferometry (D-INSAR) techniques that are based on the SAR phase difference theorem.In this research, we use multiple repeat-pass complex SAR images (1993, 1996) from European Remote Sensing Satellite (ERS-1/2) to detect differential change in surface deformation on the order of centimeters in Taiwan Kao-Ping area. After the data processing by following steps: (1)data format conversion,(2) image registration, (3)interferogram generating, (4) baseline calculation, (5) earth curvature removal, (6)baseline fine-tuning, (7) phase unwrapping and DEM generation, the relationships between interferogram and surface deformation are established . The final work is to assess the feasibility of measuring land subsidence using the D-INSAR method.

並列關鍵字

Synthetic aperture radar interferometry(INSAR) ； Land surface deformation ； Interferogram