ETH - Indoor Positioning & Indoor Navigation


16:00 - 16:30	Igor Shirokov (at Sevastopol National Technical University): Use of Homodyne Methods of Microwave Phase Measurements in a Task of Precision Indoor Positioning Microwave indoor propagation opens a good opportunity for objects positioning. The use of pulse radar method of distances and angles definition are quite unsuitable for such application. The resolution of this method is low and there is a minimal distance of pulse radar measurements which is usually higher than room linear dimension. In a paper the phase method of multipoint distance measurements is presented. The microwave phase progression was put in a basis of these measurements. The resolution of phase method of distance measurements is determined in parts of microwave length and one can reach 10 mm and higher. No doubts, the phase methods of measurements have uncertainty because the phase measurements we can fulfill in a range of 0 - 2π. In the paper the way of bypassing of this problem is shown.

16:30 - 17:00	Reimar Pfeil (presenting author), Markus Pichler, Philipp Scherz, Andreas Stelzer, Günter Stelzhammer (at ABATEC): Power Level Surveillance for an FMCW-based Local Positioning System In the frequency modulated continuous wave based local positioning system LPM the time of flight distance is determined by evaluating the frequency difference between a reference transponder and the measurement transponder inside every base station. For the normal mode of operation, this information is sufficient for precise position estimation. Nevertheless, the measurement system also provides the power level value of the received signal which can be used for monitoring the quality of the current measurement. In this contribution a signal model for the received signal power is derived with respect to the antenna beam patterns and their orientation, the hardware amplification of the LPM system and the Friis equation for the line of sight (LOS) path. Although this measurement information is too inaccurate for precise position estimation, it can be used for verifying the LOS path which is shown on real measured data.

17:00 - 17:30	Silvan Wehrli (presenting author), Heinz Jäckel: Non-Stochastic Multipath Simulations for an Indoor Local Positioning System The measurements of an active pulsed reflector in an indoor local positioning system revealed that multipath propagation has a large influence on the positioning accuracy. In this study, a channel model is developed, which calculates the multipath components based on base station and reflector positions in a room. This model allows identifying correlations between the reflector position and the distance error. The distance error is correlated to the channel damping due to multipath propagation with a correlation factor of 0.59. By comparing the distance errors of one reflector measured by 17 base stations, the reflectors with the largest standard deviation are close to a wall. The standard deviation of 3400 simulations is 17.19 cm. This is comparable to the measurement results, which resulted in a standard deviation of 26.6 cm.

17:30 - 18:00	Markus Robens (at Integrated Analog Circuits, RWTH Aachen University, presenting author), Ralf Wunderlich, Stefan Heinen: Input Amplifier for Sensitivity Improvement in an M-Sequence Radar Front-End In this paper, a new input amplifier is presented which is intended to improve the dynamic range of an M-sequence radar front-end. The latter is part of a sensor array and at the current state its dynamic range is confined by spurious tones caused by cross-talk. Owing to the advantageous characteristics of the M-sequence device it is possible to predict the receive signal by digital signal processing and thus to compensate for spurious tones. For this purpose an additional input is provided by the amplifier which is used for signal subtraction.

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