Study On Slope Monitoring Of IBIS - L Hongshiyan Weir Lake In Ground Interference Radar

The earthquake occurred in Ludian County of Yunnan Province, which is security risks, resulting a Barrier lake. a large number of rock collapsed in the right bank slope of damming body. The slope on the right side of the Barrier Lake is between 70-90 degrees, and it’s still in a relatively active state within a long period after the earthquake, so conventional methods such as Total Station and Level are difficult to lay the instrument on some specific area to do monitoring. GB-SAR IBIS-L is a new type of deformation monitoring instrument, it does not need to have direct contact with the monitoring area that is less affected by cloudy, rainy and harsh environments. compared with the traditional method, it can not only do automatic continuous monitoring all-weather and all day, choose short baseline according to target characteristics, Create specific geometric scene for the monitoring area, get status and trends of the overall deformation monitoring area in a short time, but also has high resolution and high precision. It’s always rainy in the monitoring area after earthquake, so temperature, humidity and other meteorological parameters change dramatically. In order to weaken the influence of phase wrapping, continuous monitoring mode was taking for data collection by GB-SAR IBIS-L on the right bank of the slope, Determination of active regions of new exposed rock.In this paper, the IBIS-L acquisition in Hongshiyan Barrier Lake’s right slope data were analyzed. Kaiser-Bessel window was selected for range and cross-range focusing processing, good results were obtained. According to TSNR, ESNR, Coherence and other parameters, GB-SAR image quality was analyzed and evaluated, reflection in both Ku-band electromagnetic wave emitted by radar and points in monitoring area are stable. A large part of the thesis work have been devoted to development of GB-SAR processing tools such as coherence and interferogram generation, automating the co-registration process, phase unwrapping and environment correction. According to TSNR, ESNR and other parameters, continuous high quality observation period were picked for whole deformation analysis. In the study area,9 representative points were selected for deformation trend analysis, the displacement of 9 points in the monitoring period were within 4mm, so the slope stable.Compared with the GNSS data collected in the same place and same period,the accuracy of IBIS-L in this study was proved. It provides a reference for the study of slope monitoring after the earthquake.