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大坝变形监测是大坝安全监测的一项重要内容。该文详细阐述了运用基于地基SAR的IBIS-L系统测量微小形变的基本理论,简明论述了PS-In SAR技术及其优势。以湖北隔河岩大坝采集的60幅地基SAR影像作为实验研究对象,提出一种基于热信噪比、估计信噪比、相干系数、相位稳定性四个参数的PS点选取方法。运用PS法在坝体上选取了18个特征点,通过对特征点视线向位移随时间变化情况进行分析,得出坝体结构稳定的结论,通过实例验证了IBIS-L系统在大坝位移监测领域的广阔前景。
Dam deformation monitoring is an important part of dam safety monitoring. This paper elaborates the basic theory of measuring tiny deformation using IBIS-L system based on ground-based SAR, and briefly discusses the PS-In SAR technology and its advantages. Taking 60 ground-based SAR images collected by Geheyan Dam in Hubei Province as experimental subjects, a PS point selection method based on thermal signal-noise ratio, estimated signal-noise ratio, coherence coefficient and phase stability was proposed. By using PS method, 18 characteristic points are selected on the dam body, and the displacement of the characteristic point along the line of sight is analyzed with time, and the conclusion that the dam structure is stable is obtained. The IBIS-L system is verified by the example in dam displacement monitoring Broad prospects for the field.