Research On WSN Positioning Algorithm And Its Application For Landslide Monitoring

Landslide disaster has brought great harm to the national economic construction and people’s life and property safety,Landslide monitoring and early warning is an important means of effective prevention of landslide, but the existing monitoring equipment and method for widespread staff workload, poor real-time, monitoring equipment is expensive, inconvenient installation debugging and maintenance problems, increasing the difficulty of practice.As a supporting technologies of the Internet of things, the wireless sensor network can meet the needs of complex monitoring environment, in this paper, using the common sensor nodes which spend a small amount of cost and arranged in a possible landslide area, network combined with positioning algorithm for wireless sensor network to realize the landslide displacement monitoring, the main research works as follows:①The basic characteristics of wireless sensor networks were analyzed in this paper. Compared with the short distance communication mechanism between network nodes, and considered the landslide monitoring and positioning requirements, selected the study of localization algorithm in wireless sensor network and the landslide monitoring based on Zig Bee technology;②The analysis and comparison of the existing two types of wireless location algorithm, the range free location algorithms for lower hardware requirements but positioning accuracy is not high, generally only suitable for coarse positioning; positioning accuracy ranging based on the requirements are relatively high, but only the RSSI localization algorithm on the hardware condition is relatively low;③This paper proposed an improved algorithm based on centroid localization RSSI. Combined with the practical application of landslide monitoring,--the centroid localization algorithm based on RSSI is analyzed and the algorithm is formed by the fusion of RSSI location algorithm and the centroid localization algorithm, found out the existing defects and reasons, by introducing the cooperative localization algorithm and error suppression methods of NLOS, from high positioning accuracy and coverage rate of two aspects. To improve it, and completed the design of the improved algorithm and Application Research of landslide monitoring site monitoring hardware scheme.④The simulation tests using MATLAB to complete the RSSI location algorithm and centroid localization algorithm in the same location parameters, then by modifying the number of anchor nodes, communication radius of nodes and the node changed uniformly distributed in different test environment based on centroid localization algorithm and improved RSSI algorithm simulation, results show that the improved algorithm can significantly reduce the spread of influence environment and the hardware factors on performance of positioning, positioning error is improved from 3% to 10% before the upgrade and positioning coverage can be increased by 20%, and the use of landslide monitoring system of the improved algorithm has low system cost etc.