Study on Repositioning Error Model in GBSAR Discontinuous Observation for Building Deformation Monitoring

As a new deformation monitoring method, Discontinuous Ground-Based Synthetic Aperture Radar (D-GBSAR) monitoring has gradually attracted people’s attention, and the key problem it faces is how to compensate for the repositioning error caused by radar position offset. To address the above issue, this paper studies the geometric relationship between radar spatial baseline and target, and proposes a novel repositioning error compensation method based on trigonometric model and least squares parameter estimation. The feasibility of the proposed method is verified by the measured data of buildings monitoring, based on the permanent scatterer interferometry.