Tesis doctoral de Oriol Monserrat Hernandez
The ground-based synthetic aperture radar (gb-sar) is a relatively new technique, which in the last ten years has gained interest as deformation measurement and monitoring tool. The gb-sar technique is based on an imaging radar-based sensor, which o ers high sensitivity to small displacements, in the region of sub-millimetres to millimetres, long-range measurements, which can work up to some kilometres, and massive deformation measurement capability. These features confer to the gb-sar technique interesting advantages with respect to other point-wise deformation measurement techniques. the process of estimating deformation from the gb-sar data is not straightforward: it requires complex data processing and analysis tools. This dissertation is focused on these tools, covering the whole deformation estimation process. This thesis collects the main research results achieved on this topic during my work at the active remote sensing unit of the institute of geomatics. Two di erent approaches for measuring deformation with gb-sar data are described and discussed. The irst one is the interferometric approach, based on the exploitation of the phase component of the gb-sar data, which is the commonly used gb-sar method. The second one is a non-interferometric approach, which exploits the amplitude component of the gb-sar data, o ering an interesting alternative way to exploit the gb-sar data. this dissertation has two main objectives. The first one is presenting, step by step, a complete interferometric gb-sar procedure for deformation measuring and monitoring. the second one is presenting two new algorithms, which represent the most innovative part of this thesis. The first algorithm faces the phase unwrapping problem, providing an automatic solution for detecting and correcting unwrapping errors, which is called 2+1d phase unwrapping. The second algorithm is the base of the above mentioned non- interferometric approach, which overcomes some of the most critical limitation of gb-sar interferometry, at the expense of getting less precise deformation estimates. the dissertation is divided in 6 chapters. The first one is the introduction, while the second one provides an overview of gb-sar interferometry, introducing the main aspects that are the basics of the subsequent chapters. Chapter 3 describes a complete gb-sar processing chain. Chapters 4 and 5 contain the most original part of the dissertation, i.E. the 2d+1 phase unwrapping algorithm, and the non-interferometric approach. Finally, in chapter 6 the conclusions are discussed and further research is proposed. key words: gb-sar, deformation measurement, interferometry, phase unwrapping, non- interferometric approach.
Datos académicos de la tesis doctoral «Deformation measurement and monitoring with ground-based sar«
- Título de la tesis: Deformation measurement and monitoring with ground-based sar
- Autor: Oriol Monserrat Hernandez
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 15/03/2012
Dirección y tribunal
- Director de la tesis
- Michele Crosetto
- Tribunal
- Presidente del tribunal: jordi j Mallorquí franquet
- francesco Zucca (vocal)
- (vocal)
- (vocal)