—Because of the good penetration into many common materials and inherent fine resolution, Ultra­ Wideband (UWB) signals are widely used in remote ranging and positioning applications. On the other hand, because of the high sampling rate, coherent Time of Arrival (TOA) estimation algorithms are not practical for low cost, low complexity UWB systems. In order to improve the precision of TOA estim...

Dear Editor, This paper is concerned with the underwater localization based on acoustic signals. Specifically, we will focus search of an target that can constantly broadcast a beacon signal, such as black box. Common measurements for are Doppler shift [1], time arrival (ToA) [2]–[4], difference (TDoA) [5], [6], angle (AoA) [7], etc. In this investigate fundamental limits shift-Based, ToA-Based...

A novel noise subspace based method is applied to the minimum localization system using time-of-arrival (TOA) measurements from three base stations (BS). Since the distance measurement between the mobile station (MS) and the BS bears analogy to the multidimensional similarity (MDS) between their coordinates, we express the MS coordinate as the linear combination of the BSs’ coordinates, where t...

The aim was to investigate the feasibility of making relative cerebral blood flow (rCBF) maps from MR images acquired with short TR by measuring the initial arrival amount of Gd-DTPA evaluated within a time window before any contrast agent has a chance to leave the tissue. We named this rCBF measurement technique utilizing the early data points of the Gd-DTPA bolus the "early time points" metho...

The paper presents two sensor fusion algorithms that were utilized in a wireless sensor network-based acoustic countersniper system. The technique for fusing muzzle blast Time Of Arrival (TOA) data is able to eliminate multipath effects prevalent in urban environments and to resolve multiple simultaneous acoustic sources. The approach for fusing shockwave TOA data that are generated by superson...

Single-photon avalanche diodes (SPAD) are powerful sensors for 3D light detection and ranging (LiDAR) in low scenarios due to their single-photon sensitivity. However, accurately retrieving information from noisy time-of-arrival (ToA) point clouds remains a challenge. This paper proposes photon-efficient, non-fusion neural network architecture that can directly reconstruct high-fidelity depth i...

Observations of the millisecond pulsar B1937+214 made at Nançay over 6 years show 30% rms flux variations over 13± 4 days due to Refractive Interstellar Scintillations. The arrival times (TOA) also show variations over a similar time scale 16 ± 10 days with an rms amplitude of about 0.3μsecs. These “rapid” TOA variations are anti-correlated (∼ −40%) with the flux and so are also caused by propa...

The US Federal Communications Commission (FCC) has mandated wireless network operators and mobile devices to provide accurate location information for E-911. Requirements for time of arrival (TOA) and time difference of arrival (TDOA) measurements have been specified in 3GPP LTE Rel. 9 to ensure accurate user equipment (UE) positioning even under bad conditions (e.g. with channel quickly varyin...

Ultra-wideband (UWB) radio is a new carrierless communication scheme using impulses and is a candidate technology for future communication and ranging applications. In this paper, we consider the problem of node localizing in ad-hoc networks ,in which positioning algorithm only exploits the high precision ranging capabilities offered by UWB and does not rely on GPS. A Time-of-Arrival (ToA) base...

© 2013 Mustapha Djeddou et al. 757 This paper deals with the estimation of the time of arrival (TOA) of ultra-wideband signals under IEEE 802.15.4a channel models. The proposed approach is based on a randomness test and consists of determining whether an autoregressive (AR) process modeling an energy frame is random or not by using a distance to measure the randomness. The proposed method uses ...