摘要:
相位解纏繞是干涉SAR獲取數(shù)字高度圖數(shù)據(jù)的關(guān)鍵部分,它直接影響著數(shù)據(jù)的精度。該文在Goldstein支切法的基礎(chǔ)上進行了改進,提出了根據(jù)殘差點生成質(zhì)量控制圖,運用三叉樹堆棧的方法,選擇最優(yōu)的積分路徑,阻止了由于支切線設(shè)置錯誤所引起的誤差的傳播,既保持了支切法速度快的特點,又優(yōu)化了算法,提高了解纏精度。利用仿真數(shù)據(jù)對Goldstein算法和改進算法的解纏精度進行了定量比較分析,還對ERS1、ERS2真實SAR數(shù)據(jù)進行了解纏處理。結(jié)果表明,改進算法在信噪比較小的情況下,仍能有效限制誤差的全局傳播,提高了相位解纏精度。
Abstract:
Phase unwrapping is so important that it determines the precision of the DEM of INSAR directly. To improve the precision of phase unwrapping, a new method based on method of Goldstein is given. Qualification data are produced with the inconsistent points to determine the optimal integral path. With this method, the error is restricted in a small area, the operation keeps fast, and the precision is improved. With the help of simulation of INSAR data, the capability of the two methods is compared. The result of phase unwrapping of ERS1/ERS2-SAR data shows the capability of the new method.
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