Natural Ground Information Detection Method Based on GNSS Ground Reflection Delay Signal

Abstract

For natural surface disasters in key areas, if small deformations such as surface subsidence and displacement can be continuously monitored, it can provide early warning and effectively protect people's lives. In the past, small deformations were mainly measured by using GNSS direct signal to calculate displacement changes or by using SAR information, which can only measure one point. To monitor the deformation of an area, multiple monitoring points need to be deployed. Based on this, this paper mainly adopts GNSS ground reflection delay signal, and according to the different information of direct and reflection signal paths, combined with the geometry of receiver and ground reflection point and satellite, it can solve the small deformation of the ground surface, and realize the original point measurement to surface measurement while maintaining the original measurement accuracy, so as to improve the high-precision monitoring range and reduce the number of monitoring points.