方位參數最佳化於空載SAR影像之應用

Orientation-Parameter Optimization Applied to Airborne SAR Imagery

劉家鈞(Chia-Jun Liu) ； 吳究(Joz Wu)

《航測及遙測學刊》 5卷4期 (2000/12) Pp. 23-38

https://doi.org/10.6574/JPRS.2000.5(4).2

摘要

本文是以多項式描述時變SAR載具的飛行軌跡，先說明單張SAR影像雷達測量條件式之推導及利用混合平差求解方位參數，再利用τ統計檢定之方法，對觀測資料進行錯誤偵測，以確保觀測資料之品質。以往的研究，常以二階多項式描述方位參數，而本文選擇一適當之高階多項式，再利用統計檢定之方法，進行多項式參數數目之最佳化。最後利用檢核點評估經最佳化後載具方位參數之定位精度。檢核成果顯示，平面精度方面約為4.5-5.5 m，高程方面約為5.0 m，均較二次多項式者有所改善，對於後續影像正射化之精度提升極有幫助。

關鍵字

雷達測量條件 ； 錯誤偵測 ； 參數最佳化 ； 統計檢定

並列摘要

This paper begins with elaborating the deduction and solutions of Radar-grammetric Condition Equations on a single SAR (Synthetic Aperture Radar) image, which is the time-varying SAR airborne flight locus represented with polynomial collaborating with the mixed adjustment method. As for the blunder detection in observation data, in order to apply t-test in detecting the possible blunder in observation data to assure its quality, the orientation parameter used to be described with two-order polynomial in previous researches. In this paper, one appropriate high-order polynomial is chosen in the first place to proceed with the optimization of the orientation parameter originally presented by two-order polynomial. The result of the experiment has shown that the check point precision is 4.5-5.5 meter horizontally and 5.0 meter vertically, which proves to be better than two-order polynomial. This is going to make positive contributions toward the precision promotion in the subsequent researches on geocoding of SAR image.

並列關鍵字

Radargrammetric conditions ； Blunder detection ； Parameter optimization ； Statistical test