空載合成口徑雷達影像定平面位置之先期研究

Preliminary Research on Horizontal Positioning with Airborne Synthetic Aperture Radar Imagery

10.6574/JPRS.1996.1(1).3

吳究(Joz Wu)；張奇(Chi Chang)；林德誠(De-Chen Lin)

合成口徑雷達 ； 雷達測量學 ； Synthetic Aperture Radar ； Radargrammetry

航測及遙測學刊

1卷1期（1996 / 12 / 01）

37 - 57

繁體中文

合成口徑雷達（Synthetic Aperture Radar, SAR）為不受天候及晝夜限制的主動式微波偵測系統，無論在民事或軍事上，利用SAR技術製作高解析力影像，即成為重要遙測資料的來源。在對側視雷達影像之成像原理與幾何、輻射特性做簡短說明後，吾人描述雷達測量條件式之建立，及選擇二次多項式與線性預估模式，來描述隨時間而變化的外方位參數。並引用斜距方向上線性的比例尺模式一同參與SAR影像定平面位置之探討。實驗區選在中壢市附近，涵蓋範圍約為12公里乘12公里，其間最大高程差為40公尺。此雷達影像為南北航向，像比例尺約為1／39,047，實驗區影像同名點之選取是在HP735工作站下X-VIEW軟體中所量測，而所對應的地面點坐標則是數化二度分帶1／5,000基本圖，最後以檢核點坐標的均方根誤差，作為定位精度評估的標準。

Synthetic Aperture Radar (SAR) is an active microwave detection system which can be used day or night and rain or shine. For both civilian and military concerns, high-resolution imagery resulting from SAR represents an important source of remotely sensed data.At first, basics on the forming of SAR imagery and its geometric and radiometric characteristics are explained. Next, we describe the radargrammetric conditions while adopting, respectively, second-order and linear prediction modeling for the time-varying exterior orientation parameters. A linear scale factor is utilized in cross-track ranging direction for the horizontal positioning of points on the ground with the SAR imagery.An experiment area, about 12 km by 12 km, was selected near Chungli City; the maximum height difference was 40 meters. Flight direction was north and south; an image scale estimated at 1/39,047. Conjugate points on the image were measured with X-VIEW of an HP735 Workstation. The corresponding object-space points were digitized on 1/5,000 or-thophoto maps. At the end, the root mean square errors of independent check points serve as the indices of our accuracy evaluation.