Bertrand Tay

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Node positions in a wireless sensor network are required to track the nodes in real-time, but normally no prior information is given on deployment. A locating mechanism is required for such a purpose and in this paper a method is described to determine the point-to-point distance between two sensor nodes in an asynchronous location positioning system. A(More)
We consider the problem of estimating the position of an indoor wireless transmitter. Based on Angle of Arrival (AOA) readings from several base stations, a wireless transmitter's position has traditionally been determined using a least-squares approach. In particular, care is taken to ensure that the least-squares estimator is unbiased. Unbiased estimators(More)
There are various Real-Time Locating Systems (RTLS) in the market now. Each type of RTLS fits different needs, depending on its ranging and precision. There is a RTLS that gives the highest precision than ever, that is Ultra-Wideband (UWB) RTLS. This paper first gives an overview on RTLS and UWB. The paper then describes the UWB RTLS, introducing the(More)
While Two-Way Ranging (TWR) is generating interest as a accurate and low-cost indoor localization technique, most TWR research focuses primarily on algorithms or error reduction, with little regard to a fundamental system-level issue: deciding which Base Stations (BS) should perform the TWR. While most researchers acknowledge the need for a scanning phase(More)
Manufacturing shop floor dynamics such as machine performance degradation or breakdown will affect the execution of planned production schedules. An intelligent shop floor is able to react to changes in a positive way. To give the early warning of the system/equipment health conditions and mission execution capability to the supervisory control will improve(More)
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