LAMOS-BOHSAI: LAndslide Monitoring System Based On High-speed Sequential Analysis for Inclination

I. Petrovski, S. Kawaguchi, H. Torimoto, M. Asako, T. Chachin and K. Okano

Abstract:	This paper describes a landslide monitoring system (LAMOS), which implements Real Time Kinematic positioning and represents an economical and, at the same time a precise technique for monitoring both slow permanent and intense short-term movements. The second part of the system’s name BOHSAI stands for Based On High-speed Sequential Analysis for Inclination where, we define the term inclination as a general slope movement. Also in Japanese, the word “bohsai” means disaster prevention. This paper discusses a landslide monitoring system that has been developing by DX Antenna since 1996. The work began as a joint project between DX Antenna and Kyoto University Disaster Prevent Research Laboratory. Landslides related to disasters that don’t attract a public attention, nevertheless constantly cause economical and sometime human losses. Up to now, landslide monitoring has been mostly achieved by means of mechanical instrumentation, such as extensometers, borehole inclinometers, and three-dimensional shear displacement meters. The implementation of the GPS network allows potentially better position accuracy, along with timely warnings of potential disaster. The facts are working against an implementation of the GPS based systems include their high cost and concern about the high probability of sacrificing expensive equipment in a disaster. The LAMOS had been designed to bring the advantages of the GPS implementation at a much low cost, and to prevent the loss of expensive equipment. The LAMOS consists of a base station and a set of rover receivers, each of which acquires information from several remote stationary antennas, one by one. The antennas can be located some distance from the receiver. The base station coordinates could be tied up with Japanese Geographical Survey Institute (GSI) GPS network. The PC based software logs and processes GPS signals in real-time and post-processing modes. The software provides a constant stream of data, in different format, for further analysis and storage. Based on this data, the software makes estimation of time and area of possible landslide in advance. Algorithm responsible for such a forecast is based on the displacement dynamics, ground and weather characteristics. Timely warning is achieved by a specially constructed alarm system, that connects either PC in automatic mode or human operator in manual mode to the inhabitants of a hazardous area. The specially designed algorithms support two mode information processing, multi-antenna implementation, database forming and failure-time estimation. This paper discusses hardware and software that were designed for LAMOS, implemented algorithms, and the results of experiments. Experiments have been conducted with system of reduce size. The results we obtained allows us to make a conclusion that LAMOS technology make it possible to accomplish landslide monitoring both in RTK, and static mode with the number of receivers less then number of sites.
Published in:	Proceedings of the 2000 National Technical Meeting of The Institute of Navigation January 26 - 28, 2000 Pacific Hotel Disneyland Anaheim, CA
Pages:	306 - 316
Cite this article:	Petrovski, I., Kawaguchi, S., Torimoto, H., Asako, M., Chachin, T., Okano, K., "LAMOS-BOHSAI: LAndslide Monitoring System Based On High-speed Sequential Analysis for Inclination," Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2000, pp. 306-316.
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