Abstract
This paper shows that the accuracy of azimuth angle measurement for an interferometric localization system used to locate tags in its Line-of-Sight (LoS) can be improved by exploiting Impulse Radio-Ultra WideBand (IR-UWB) signals and without increasing the frequency bandwidth. This solution uses a Phase Correlation (PC) method, initially applied for Continuous Wave (CW) signals, adapted for Ultra WideBand (UWB) pulse signals. The obtained results are compared to those computed by a classical Energy Detection (ED) method where it becomes impossible to estimate azimuth angles for tag positions close to the orthogonal centered axis of the localization system baseline.
Highlights
In recent years, indoor localization has gained interest due to the vast range of services it can offer in many areas and applications
We propose in this paper an alternative solution of low complexity based on Phase Correlation method adapted to Impulse Radio-Ultra WideBand (IR-Ultra WideBand (UWB)) signals, improving the accuracy and resolution of the azimuth angle measurement for an interferometric localization system
To estimate the ToA of the received signal, the block carrying the maximum energy is searched. With this method, the resolution is led by the size of blocks, here equal to 1 ns, where the minimum size is fixed by the minimum energy able to be detected
Summary
Indoor localization has gained interest due to the vast range of services it can offer in many areas and applications. These algorithms use a low sampling rate and three variants of the ED method, namely, Maximum Energy Selection (MES), Threshold Comparison (TC), and Maximum Energy Selection with Search-Back (MES-SB) These algorithms do not require precise synchronization or pulse shapes but rather need a strong signal at the detector input. A trade-off between the required accuracy, resolution, and complexity must be taken into account when developing a ToA estimation algorithm To this end, we propose in this paper an alternative solution of low complexity based on Phase Correlation method adapted to IR-UWB signals, improving the accuracy and resolution of the azimuth angle measurement for an interferometric localization system. The main advantage of an interferometric method is that the position of a person/object in a room without obstacles can be obtained using only one fixed anchor instead of a well-known constellation
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