中文摘要：

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ENVISATASAR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68000个增加到186400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。

英文摘要：

Due to temporal and spatial decorrelation and other noise, the integer-cycle jumps always appear in the unwrapped phase. It is well known that phase unwrapping errors represent one of the major limitations of Interferometric SAR （InSAR）. A phase closure method is presented to detect andcorrect phase unwrapping errors for discrete coherent points in InSAR time series analysis. Its application to ENVISAT Advanced Synthetic Aperture Radar （ASAR） data over the coastal zone of Cang- zhou, Hebei Province showed a significant improvement in the InSAR time series results, with the number of valid coherent pixels increasing from 68 000 to 186 400 and the root mean square （RMS） decreasing from 13.1 mm to 5.3 mm and 17.5 mm to 4.3 mm for two deforming areas respectively.