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Innovative Metrology 2017

Rückblick: Innovation Messtechnik 2015

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Methods for object localization and estimating bearing

Thomas Voglhuber-Brunnmaier

Thomas Voglhuber-Brunnmaier

The present thesis discusses three different methods to locate objects (Time Of Flight, Differential Time Of Flight, GPS) and one method for estimating bearing. All mentioned methods in different ways depend upon the time delay estimation between a known or unknown sent signal and the signal detected on a predetermined location. Special emphasis is placed upon the analysis of error propagation in dependence of the used measurement configuration and the relative position of the object to detect with regard to the configuration. This leads to an evaluation of credibleness and achievable accuracy of each method.

Employing statistical methods and model-based assumptions of estimation theory, simulations of the methods mentioned above are created. Analytically found dependencies of the models from determined parameters are verified empirically by using these simulations. Finally, all methods to locate objects and to determine bearings are implemented within the audible sound field, and the results obtained are compared to the analytical and the empirical results.

Figure 1: Object/receiver configuration for estimating the object position appying the inverse GPS method.   The orange sphere shows the messurement offset and BS 1 to BS 8 are the receiver elements.

Figure 1: Object/receiver configuration for estimating the object position appying the inverse GPS method.
The orange sphere shows the messurement offset and BS 1 to BS 8 are the receiver elements.

Figure 2: Microphone array used for acoustical bearing estimation employing 8 circularly arranged elements.

Figure 2: Microphone array used for acoustical bearing estimation employing 8 circularly arranged elements.

March 2007