Application Of Ground Radar In Slope Deformation Monitoring

In recent years, as an innovative technology, ground-based radar technology has the advantages of high spatial resolution, high time resolution, real-time, all-weather and high security, whose application areas are radually expanded. In the field of surveying and mapping, researchers tend to pay more and more attention on ground-based radar technology, which has become one of the research hotspots among photogrammetry and remote sensing. Due to the ground-based radar using microwave as the propagation signal, affected by humidity, temperature, pressure, and other meteorological factors, as to implement high-precision observations, the efficiency to eliminate the influence of meteorological is crucial. Domestic and foreign scholars mainly use ground-based radar for short time and short distance deformation monitoring, i n this paper, according to the slop monitoring for long time and long distance, a superior correction solution is proposed, and study the feasibility of ground-based radar in slope continuous monitoring with long distance.Firstly, this paper elaborates conventional monitoring’s principle, the technology principle of ground-based radar, and describes the principle of Tyson polygon and Microwave Refraction. Then we refer to the technical design scheme, and place the radar equipment and meteorological data acquisition device; As the corner reflector on the radar signal to noise image was bright red, compare the image before and after resettlement to identify the location of all observations pier; According to Tyson polygon rule and microwave refraction principle, combining high reflection intensity, high signal to noise ratio and high correlation of corner reflector, proposed using corner reflector as the a permanent scatterer and the establishment of meteorological correction models for environmental impact correction. The target point’s displacement obtained by conventional monitoring is three-dimensional; so as to get the displacement in the radar line of sight, projection is needed. On this basis, the results of ground-based radar monitoring and conventional measurement were compared and analyzed, analysis of the feasibility of ground-based radar station in slope monitoring.Experimental in Nuozhadu power plant, the large hydropower station slope were monitored continuously for several months, at the same time, analysis and processing of the monitoring data. Experimental results showed that the precision of ground-based radar technology in the radar line of sight direction were better than millimeter-level. The accuracy of ground-based radar technology along the line of sight better than TM30 of total station, so ground-based radar technology can achieve high-resolution, high-precision, real-time large-scale hydropower slope deformation monitoring.