Abstract
Ultra-wideband (UWB) networks are gaining wide acceptance in short- to medium-range wireless sensing and positioning applications in indoor environments due to their capability of providing high-ranging accuracy. However, the performance is highly related to the accuracy of measured position and antenna delay of anchor nodes, which form a reference positioning system of fixed infrastructure nodes. Usually, the position and antenna delay of the anchor nodes are measured separately as a standard initial procedure. Such separate measurement procedures require relatively more time and manual interventions. This paper presents a system that simultaneously measures the position and antenna delay of the anchor nodes. It provides comprehensive mathematical modeling, design, and implementation of the proposed system. An experimental evaluation in a line-of-sight (LOS) environment shows the effectiveness of the anchor nodes, whose position and antenna delay values are measured by the proposed system, in localizing a mobile node.
Highlights
The use-case applications of real-time localization systems (RTLSs) are essential across various fields, such as in healthcare, industries, surveillance, crisis management, and so on [1,2,3]
To ensure that a time of flight (TOF) estimated from NLOS conditions is rarely used for position estimation, we assume a rule of anchor placement where a mobile node in the coverage area should typically find LOSs to at least four nearby anchors
Reductions of approximately 72.59% and 60.47% with respect to the pre-calibrated and post-calibrated cases, respectively. This further signifies that the post-calibrated case of anchor nodes was effective in localizing the mobile node at each of the test points for multiple simultaneous ranging (MSR) as well
Summary
The use-case applications of real-time localization systems (RTLSs) are essential across various fields, such as in healthcare, industries, surveillance, crisis management, and so on [1,2,3]. RTLS, the calibration process should comply with collectively measuring the position and antenna delay of the anchor nodes as a standard initial procedure. This would simplify the calibration process by making it less time-consuming and requiring fewer manual interventions. The key attributes of the proposed system are as follows It simultaneously measures the position and antenna delay values of anchor nodes in a UWB-based RTLS. It does not require a reference system of predefined coordinates for placement coordination among anchor nodes. The measurement process does not require clock synchronization of the UWB nodes
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