Numerical and experimental investigation of TDOA-based positioning system by ultra-wideband impulse radio

Abstract

This paper describes a TDOA-based positioning system by means of ultra-wideband impulse radio (UWB-IR). The system consists of three reference nodes and a location server. One of the reference nodes transmits an impulse signal to other reference nodes for synchronizing them immediately after receiving an impulse signal sent from a target node. Thus, no additional component for the synchronization is needed in our system. The positioning accuracy was investigated by a simulation and an experiment. The experiment was performed with our UWB-IR transceivers and the results demonstrated that 67% of the position estimates correctly predicted the true positions within 0.36 m.Index Terms -Indoor radio communication, microwave communication, personal area networks, ultra wideband communication, wireless sensor networks.

Utilization of Carrier-Frequency Offset Measurements in UWB TDoA Positioning with Receiving Tag

“…The estimate of the drift can be obtained from the CFO measurements ν [MT] with respect to the master anchor; the difference of the propagation delays corrected for the drift-related error yields In order to reduce the effect of the CFO measurement noise on the positioning, the average value of CFO among all anchors received in the particular epoch ν[MT] is utilized. Since the anchor local clocks are not physically synchronous with the master clock, result (20) is employed to obtain the CFO with respect to master anchor. The average CFO is…”

“…If the UWB messages are transmitted at the (almost) same time, the tag cannot receive them in a regular way, the time of arrival differences have to be deduced from the channel impulse response (CIR) estimated by the receiver. Such an approach is adopted e.g., in [20][21][22]. Problems with identification of the individual transmitters of the signals observed in CIR and masking of pulses from similarly distant anchors are inherent to this approach.…”

TDOA estimation using a pair of synchronized anchor nodes

“…In [6][7][8], master tag, which periodically sends packets, is placed at a known position. It preferably has a high stability clock and therefore provides reference for the anchor nodes and measurements of the times of reception of the packets from other tags.…”

Development of UWB-IR based low power asset tracking system with precise location information

“…The research area related to Internet of Things (IoT) has been advancing as it enables a connectivity between objects and human beings [27]. In this scenario, the real time data information from sensors placed on objects along with their location is an important requirement [28] and hence, to succeed in this goal, the real time indoor positioning system becomes a necessary contender [29], [30]. The related literature review is presented for each problem separately.…”