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H. Kahmen, S. Mastelic-Ivic, H. Damjakob:
"Deformation Analysis as a Support for Improving of the Stability of Industrial Buildings";
Talk: Symposium on Geodesy for Geotechnical and Structural Engineering, Berlin; 2002-05-21 - 2002-05-24; in: "Geodesy for Geotechnical and Structural Engineering II", Berlin (2002), ISBN: 3-9501492-1-x; 71 - 81.

Abstract: Buildings of nuclear power stations must frequently be controled by inspection measurements. This paper describes, how the construction of a cooling tower, an important component of a nuclear power station, was controled by deformation measurements and deformation analysis. It is shown that the deformation models can finally be used, to support the activities for improving the stability of the structure.

Since 1988 different measurement systems were used for the quality control: the shell of the tower was controled by spatial intersection using a video theodolite and a pointing theodolite and the ground plate by leveling systems. Now for the first time some results can be published.

The deformation analysis is based on Kalman filtering. The standard Kalman filter is a a low-pass filter. Therefore it can only be applied for the estimation of low frequency deformation signals. However, in many cases, the deformation process is described by a very complex spectrum of high and low frequency signals. With this publication will be shown, how modified Kalman filters can meet these requirements. The modified filters are based on the correlation functions of the processes.