2023 Volume 1 Article ID: 71
A corner reflector (CR) is a passive device that reflects electromagnetic energy to return to the source of energy. It has been implemented as a known location and displacement for the calibration and validation of SAR data. Moreover, it can be employed for accurate surface displacement monitoring. In this study, we experimented with 2 different sizes of CRs at the playground of the university including 50 cm small CR and 141.4 cm large CR (side length dimension). The CR reflectors have been set up with appropriate orientation and tilt angles regarding targeted SAR sensors. Afterward, radar cross-section (RCS) and signal-to-clutter ratio (SCR) of CR were performed and compared with the theoretical expectations. SCR value can be used to estimate displacement error. This study found that large CR offered significant visibility and stability than small CR. Large CR provided higher SCR more than 28 dB (equivalent to 0.12 mm of phase error in a single SAR data), and small CR provided SCR at 14.58 dB (equivalent to 0.58 mm of phase error). The evaluation of this study is beneficial for gaining insights into the potential and limitations of CR performance with specific SAR data. This can aid deciding an optimal CR and calibration site for accurate displacement monitoring in the future.
