Abstract
Abstract. This paper is focused on SAR interferometry for deformation monitoring, based on the use of passive and active reflectors. Such reflectors are needed in all cases where a sufficient response from the ground is not available. In particular, the paper describes the development of a low-cost active reflector. This development was carried out in an EU H2020 project called GIMS. The paper summarizes the key characteristics of the developed active reflector. The reflector was tested in two main experiments: the first one located in the campus of CTTC and the second one in a GIMS test site located in Slovenia. The experiments demonstrate the visibility of the active reflectors and provide the first results concerning the phase stability of such devices.
Highlights
The success of SAR interferometry highly depends on the presence of good visible targets in the area to be imaged by the radar sensors (Bamler and Hartl, 1998; Rosen et al, 2000; Hanssen, 2001)
The experiment consisted of the following steps: 1. In situ installation of a Passive Corner Reflectors (PCR) and an Active Reflectors (AR); in addition, a Natural Corner Reflector (NCR) was considered in the analysis
We looked for pixels with strong amplitude value that were starting the data of the ACR1 installation
Summary
The success of SAR interferometry highly depends on the presence of good visible targets in the area to be imaged by the radar sensors (Bamler and Hartl, 1998; Rosen et al, 2000; Hanssen, 2001). In urban and densely populated areas, buildings and infrastructures are available as “natural” good reflectors, while in vegetated areas installation of artificial reflectors called Passive Corner Reflectors (PCR) and Active Reflectors (AR) is key to achieve a good response. The latter one is the more advanced solution. A PCR is a passive target with a simple geometrical shape, designed to perform a high radar reflectivity. Such objects are usually constructed with metal plates of a size larger than the wavelength, and with faces oriented toward the radar to maximize the energy reflected back to the radar. The installation of a PCR can be difficult due to hard accessibility, e.g. in landslides, glaciers, etc
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