Abstract
Object positioning based on phase method measures the distances among transponders (placed on objects) and beacons (placed at reference points) in terms of microwave phase difference or in parts of wavelengths. Such approach assumes a high resolution in distance determination. Specifically, the homodyne method considers microwave phase difference measurements. The beacons are placed in a room and radiate the microwave signals. The transponders are devices wearable by elders/disabled who have to be located. The transponders shift the frequencies of microwave signals (each transponder its own frequency shift) and reradiate the frequency-transformed microwave signals back in the directions of beacons. Each beacon selects the low-frequency difference signals and measures the phase differences between these signals and the reference one. Based on these measurements the distances to transponders are calculated.
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Shirokov, I. (2012). Precision Indoor Objects Positioning Based on Phase Measurements of Microwave Signals. In: Chessa, S., Knauth, S. (eds) Evaluating AAL Systems Through Competitive Benchmarking. Indoor Localization and Tracking. EvAAL 2011. Communications in Computer and Information Science, vol 309. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33533-4_7
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DOI: https://doi.org/10.1007/978-3-642-33533-4_7
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-33532-7
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