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提出了一种基于三角形闭合环残差的离散相干点解缠相位误差检测与校正算法,该算法能有效提高离散相干点解缠相位的精度。以沧州市沿海地区为实验区域,利用2008~2010年18景ENVISAT ASAR数据进行InSAR时序分析,对解缠相位跳变误差进行检测和校正,并对比校正前后时序分析结果的精度。实验结果显示,解缠相位一致性检查和误差校正可以有效改正解缠干涉图中的主要相位跳变误差,与改正前相比:1离散点时序累积形变特征的时间连贯性更强,减少了很多突跳;2增加了有效相干点,实验区内有效相干点个数由68 000个增加到186 400个;3两个验证点累积形变量的RMS值分别降低了8.1mm和13.2mm,证明了该方法的有效性。
A phase error detection and correction algorithm for discrete coherence point unwrapping based on triangular closed-loop residuals is proposed. The proposed algorithm can effectively improve the accuracy of unwrapping phase of discrete coherent points. Taking Cangzhou coastal area as an example, the InSAR time series analysis of 18 ENVISAT ASAR data from 2008 to 2010 was carried out to detect and correct the unwrapped phase jump error. The precision of the results before and after correction was compared. The experimental results show that unwrapped phase consistency check and error correction can effectively correct the main phase jump error in the unwrapped interferogram. Compared with the pre-correction, the time-dependent cumulative deformation feature of discrete points is more consistent and less time-consuming Many jumps; 2 increased the effective coherence point, the number of effective coherent points in the experimental area increased from 68 000 to 186 400; 3 the RMS values of cumulative deformation variables of the two verification points decreased by 8.1 mm and 13.2 mm respectively, The effectiveness of this method.