The atmosphere affects the propagation of radar signals by provoking unwanted signal phase changes. In interferometric applications, such as coherent change detection and displacement measurements, this effect may significantly degrade the system performances. Moreover, atmosphere-induced phase changes are both time- and space-variant and, therefore, they are not easy to be removed. This paper proposes a novel method to remove atmospheric effects by using a parametric model of the refractive index, which is derived as an extension of the ITU-R model. The proposed algorithm has been tested on real data acquired by using a GB-SAR system in conjunction with data collected by a weather station. Data have been acquired continuously for three consecutive days, approximatively every 5 minutes. Results have shown how the proposed method can effectively remove atmospheric effects and restore the signal phase.
A parametric model-based approach for Atmospheric Phase Screen removal in Ground-Based Interferometric SAR
Martorella M.
2021-01-01
Abstract
The atmosphere affects the propagation of radar signals by provoking unwanted signal phase changes. In interferometric applications, such as coherent change detection and displacement measurements, this effect may significantly degrade the system performances. Moreover, atmosphere-induced phase changes are both time- and space-variant and, therefore, they are not easy to be removed. This paper proposes a novel method to remove atmospheric effects by using a parametric model of the refractive index, which is derived as an extension of the ITU-R model. The proposed algorithm has been tested on real data acquired by using a GB-SAR system in conjunction with data collected by a weather station. Data have been acquired continuously for three consecutive days, approximatively every 5 minutes. Results have shown how the proposed method can effectively remove atmospheric effects and restore the signal phase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.