Skyscrapers Watch Using an INS/GPS Integrated POS Grid

C-Y. Li

Abstract:	Conventional building monitoring technologies usually need to embed sensors to the infrastructure; this would be considered as the destructive way to monitor the movements of buildings. In recent decades, their functionalities have been proven successfully as most skyscrapers around the world are installed with embedded sensors including fibber optic sensors and accelerometers during the construction. However, they may not be desirable for some existing historical and tall buildings because heavy installation works for those embedded sensors may cause unexpected damages to the buildings. This study tries to seek the possibility of using low cost INS/GPS POS sensors with light installation works to set up monitor grids on high-rise and valuable buildings as sensor networks for earthquake early warning or detection systems. Currently, observations have been arranged on the top of skyscrapers like Taipei 101 (509.2 meters high), the second highest skyscraper in the world, and 85 Sky Tower (347.5 meters high), an 85-floor skyscraper located in Kaohsiung City, Taiwan. For further analysis, the Wavelet Transform (WT) was used to give the specific time of the eruption of certain high frequency events while traditional Fast Fourier Transform (FFT) only gives the frequency composition of a signal. The Continuous Wavelet Transform (CWT) spectrum analysis was applied to provide specific frequency information to identify the sources of disturbance; moreover, it revealed exactly when certain events take place. The preliminary results illustrated that the proposed POS grids detected the variations caused by the winds blowing from ocean to inner lands successfully in navigation solutions domain including position, velocity and attitude components. In addition, their spectrums illustrated similar responses thus made the findings of this study consistent.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	635 - 648
Cite this article:	Li, C-Y., "Skyscrapers Watch Using an INS/GPS Integrated POS Grid," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 635-648.
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