The main objective of this study was the application of CORS and single-frequency GPS system for continuous deformation monitoring on natural events, especially for geological disasters and development of a large-scale region monitoring system within Guangdong Province. In this paper, a near-real-time slope slide monitoring technique was presented, which is applied in Guangdong Province. The method and algorithm to achieve centimeter-level (even mm-level) deformation monitoring was discussed in detail. The system was integrated with low-cost devices including both the single-frequency GPS receiver and the GPS multi-antenna System(GMS), based on the Guang-Dong Continuously Operating Reference Stations (GDCORS). After the coordinates reference system was formed by GDCORS system, the displacement of surface deformation in geological disasters were monitored by GPS/CORS integration algorism with mm accuracy level. It is pivotal to detect the distinct geological disaster-related displacement deformation evidence automatically and extract the temporal and spatial characteristics in the whole process of the deformation, which includes the following four steps: outlier detection, adaptive threshold classification, deformation evaluation and deformation parameters auto-detection. The hypothesis and test, threshold classification tools were used, based on Kalman filter analysis, to realize uniform deformation parameters auto-detection applicable to multi-scale accuracy demand from decimeter to millimeter level.Experimental data from both GDCORS based geological disaster monitoring simulation and the the slope at Si-hui high School were used to evaluate the performance of the technique. It showed that 2 mm accuracy for 40.7km distance for deformation monitoring was reached. It is pivotal to provide a potential and applicable reference to monitor geological hazard continuously with high spatial and temporal resolution, especially at a largescale,e.g. the whole provincial region.
WEI Pingxin, LI Chenggang, XU Feng, SHI Xiaochun
. Study on Slope Slide Real-Time Monitoring System in Guangdong Using GPS/CORS Integration Technique[J]. Journal of Geo-information Science, 2011
, 13(4)
: 562
-570
.
DOI: 10.3724/SP.J.1047.2011.00562
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