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利用10景PALSAR影像,采用小基线DInSAR技术对天津塘沽地区2007年10月至2009年10月的地面沉降状况进行反演。在差分干涉处理中,按照小基线原则进行干涉对组合,并利用埃尔米特等距插值对PALSAR轨道数据进行内插处理,提高了平地相位的计算精度。利用相位稳定性分析法选择出高相干点,通过对这些高相干点进行误差项分离,最终提取出形变信息。研究结果与已有文献记录保持了较好的一致性,验证了小基线DInSAR技术的可靠性与可行性。
The 10-scene PALSAR images were used to reconstruct the land subsidence from October 2007 to October 2009 in Tianjin Tanggu using a small baseline DInSAR technique. In the differential interference processing, the interference pairs are combined according to the principle of small baseline, and the PALSAR orbit data is interpolated by using the equidistance of Elmin, which improves the calculation accuracy of the phase of the ground. The phase stability analysis method is used to select the high coherence point, and the error information is separated from these high coherence points to finally extract the deformation information. The results are in good agreement with the existing literature and verify the reliability and feasibility of the small baseline DInSAR technique.