A novel subsidence monitoring approach based on multi-GNSS illuminator bistatic interferometry

This paper proposes a novel subsidence monitoring method. The method utilizes multi Global Navigation Satellite System (GNSS) as illuminators, a receiver employed in reference station and a transponder set in the region of interest as a measurement station to construct the real time subsidence monitoring system. Exploiting the commonness of the errors in both the reference station and the measurement one, extending the principle of traditional differential GNSS (DGNSS) to a radar-transponder counterpart, a low cost and high accuracy system with 3 dimensional deformations estimation ability can be realized. Simulation is conducted to analyze the performance and validate the proposed method. The result shows that the proposed method is able to achieve sub-centimeter accuracy in short coherence time, promising its potential application in some security fields such as the high-speed railway roadbed subsidence monitoring.