摘要
對空載合成孔徑雷達SAR影像之幾何校正，本文提出一正射化模式，此模式包含載具飛行參數求解與正射化程序，在飛行參數求解過程中，是將斜距間距及方位間距視為SAR已知系統參數，配合地面控制點幾何條件進行計算。在正射化過程中利用影像上在沿一回波線列斜距方向上斜距與觀測角變化為單調遞增關係，經檢核像元間變化獲取正射影像中疊置或陰影之區域。在空載SAR影像研究範例中是以山區高度約為350公尺影像，使用地面控制點30點進行載具飛行參數求解，並利用數位高程資料產生正射化SAR影像，在此正射影像獲得地距誤差為10公尺左右，約為SAR原影像上1.5個像元以內，同時得到地形造成SAR影像的疊置或陰影區域。
並列摘要
We develop the ortho-rectification model to correct the airborne SAR slant-range imagery. This model include estimation of flight parameters and ortho-rectification procedure. We estimated the flight parameters with the ground control points, both the slant range spacing and azimuth spacing are known. We rectified the SAR imagery with a given digital elevation model and the estimated flight parameters. Here we have considered the effects of layover and shadow, we checked the variation of slant range and look angle along the direction of slant range. The tested data was taken over a mountainous area. The elevation within this area are about 350 m. We rectified the airborne SAR imagery with the digital elevation model data and 30 control points. The root mean square errors of slant range for ground control points and check points is about 6m. The resulting ground error is about 10m(1.5 pixels of slant range imagery) even in the mountainous area. The Paper is concluded by remarking on how to produce ortho SAR images which exhibit the phenomena of layover and shadow.