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Title:	乾延遲改正後之雷達差分干涉成果評估
Authors:	林士淵
Contributors:	地政系
Keywords:	合成孔徑雷達差分干涉;大氣效應;乾改正 D-InSAR;Atmosphere Delay;Dry Delay Correction
Date:	2014
Issue Date:	2016-08-25 14:39:00 (UTC+8)
Abstract:	合成孔徑雷達資料具備不受氣候影響、日夜皆可蒐集資料等特點，所獲取之雷達影像若配合雷達差分干涉技術，即可獲得公分等級之地表變形，因此雷達遙測技術已廣泛應用於偵測各類地表形變。然而，因雷達訊號穿透大氣層而有大氣延遲效應，進而降低偵測地表變形之精度，故需在干涉處理過程中改正大氣延遲影響量，從而獲得正確之地表變形。本研究使用取像於2007年至2011年間之六張ALOS PALSAR單偏極衛星影像，探討在進行二軌跡差分干涉處理中，大氣延遲中的靜力平衡誤差（乾誤差）對干涉成果的影響。研究成果顯示，乾延遲改正後之有效改正點比例在0.36至0.59之間，而有效改正點之平均改正幅度在48.3%至63.0%之間，可知乾改正之執行對於提高地表形變之精確度確有效果。 Synthetic Aperture Radar (SAR) is capable of day/night and all-weather data acquisition, moreover, detection of centimeter-level deformation is achievable through differential interferometric synthetic aperture radar (D-InSAR) technique. However, due to the atmosphere delay, the surface deformation extracted through D-InSAR processing is incorrect. In order to improve the accuracy, the atmospheric correction is required. This paper focused on the reduction of errors caused by dry delay. A total of seven ALOS PALSAR images acquired from 2007 to 2011 was processed with 2-pass D-InSAR technique to extract surface displacement. Once this was achieved, dry delay effect was computed based on the data collected from local weather stations and then applied to remove the atmospheric dry delay error. It was shown that the accuracy of 36% to 59% of the check points in the six pairs was improved after dry delay correction. The characteristics of the dry delay effect were also examined. It was suggested that dry delay correction is essential for achieving accurate D-InSAR surface displacement results.
Relation:	航測及遙測學刊, 19(3), 195-212
Data Type:	article
DOI link:	http://dx.doi.org/10.6574/JPRS.2015.19(3).3
DOI:	10.6574/JPRS.2015.19(3).3
Appears in Collections:	[Department of Land Economics] Periodical Articles

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