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Time of signal arrival determination accuracy has a great impact on a UWB positioning system performance. The method proposed in the paper utilizes samples of a baseband signal available in direct conversion receivers. The time of arrival is calculated from quadrature signal components. The paper contains the description of the proposed method and presents results of its investigation. The method...
The paper deals with intra-vehicle ranging based on the time of arrival technique. The aim of the presented work is to compare the ranging accuracy in the 3 to 11 GHz ultra-wide band and the 56 to 64 GHz millimeter wave band. The comparison is performed using channel impulse responses calculated from complex transfer functions using a windowed IFFT. The complex transfer functions are measured by a...
Over the last years, there has been a great deal of interest in Ultra Wideband (UWB) wireless communication and Wireless Sensor Networks(WSN), especially following the proposing of the internet of things by the MIT (Massachusetts Institute of Technology) in 1999, hich is also result in an increasing research on UWB and WSN applications. This article mainly introduced the accurate UWB Localization...
The present paper considers how to improve estimation accuracy in a time of arrival (TOA) localization system using UWB in a non-line-of-sight (NLOS) environment for a sensor network. This algorithm consists of step-by-step compensation on the basis of two approaches considering a reference position which is estimated from data affected by NLOS delay. The first consideration consists of determining...
The extremely high resolution of Ultra-Wideband (UWB) signal in time domain and range measurement precision makes it advantageous in precise positioning. The algorithm based on averaging TOA is effective in reducing error in the precision positioning of stationary targets. But for moving targets, severe error will be introduced which makes the method unusable. This paper presents two means to improve...
In this paper, we exploit the concept of data fusion in UWB (ultra wide band) localization systems by using different location-dependent observables. We combine ToA (time of arrival) and RSS (received signal strength) in order to get accurate positioning algorithms.We assume that RSS observables are usually available and we study the effect of adding ToA observables on the positioning accuracy. The...
In this paper, various positioning algorithms for range-based TOA and TDOA localization have been analyzed, which include the analytical method, least square method, approximate maximum likelihood method, Taylor series method, two-stage maximum likelihood method and genetic algorithm. The assumed scenario is an overdetermined system in a 3D space under line of sight (LOS) situation and a number of...
Localization of sensor nodes has become an important research topic in the area of Wireless Sensor Networks (WSN). Ever since the Federal Communications Commission (FCC) allowed the use of unlicensed Ultra-Wideband (UWB) communications, the accurate positioning and low cost characteristics of UWB made it a suitable physical layer standard for WSN. The localization of the sensor nodes can be done either...
In this paper we present a combined angle-of-arrival and time-of-arrival localization scheme, based on two-way range estimation as defined in IEEE 802.15.4a and additional angle estimation, using two closely spaced receiving antennas. Practical measurement results are presented, showing the potential of combined AOA/TOA localization.
This paper addresses ranging in quasi-static environments and presents a time of arrival (TOA) based ranging algorithm. An accurate estimate of signal arrival time is considered essential in time-based wireless and indoor location systems. Super-resolution techniques are applied to the general problem of temporal analysis of the received signal. For this study an experimental model of a UWB multipath...
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