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Multimodal spellers combining visual and auditory stimulation have recently gained more attention in ERP-based Brain-Computer Interfaces (BCIs). Most studies found an improved efficiency compared to unimodal paradigms while few have explored the effect of the visual-to-auditory delays on the spelling performance. Here, we study five conditions with different visual-to-auditory delays, in order to...
In this paper we focus on radio-based navigation of an autonomous dynamic swarm system of agents. We assess the anchor-free localization and investigate the impact of the performance of localization to a swarm flocking algorithm. Low latency is crucial in a dynamic autonomous swarm system to control the formation of the swarm. Therefore, an agent applies the randomized orthogonal frequency-division...
Localisation or position determination is one of the most important applications for wireless sensor networks since the locations of the sensor nodes are critical to both network operations and most application level tasks. Numerous techniques for localisation of sensor nodes have been proposed that make use the Received Signal Strength Indicator (RSSI) from sensor nodes due to its simplicity and...
Chang'E-2(CE-2) extended mission started from June 2011, the maximum distance between CE-2 and the Earth is about 1,700,000 km. In this paper, orbit determination for CE-2 extended mission is discussed, and the orbit accuracy during transfer orbit phase is assessed. The results show that under current tracking condition, the orbit accuracy during the early escape orbit phase is at the level of 1km...
This paper describes the design and implementation of a mobile application (app) for acoustic ranging developed for the Android platform. The ranging strategy used is an extension of the Microsoft Windows based BeepBeep method. Using only the speaker and microphone hardware supplied with commercial Android devices, indoor ranging precision under a 0.1 centimeter variance has been achieved at distances...
There are some common problems, such as low location accuracy and low sampling efficiency, existing in the present node localization algorithms that are based on Monte Carlo Localization (MCL) in mobile wireless sensor networks. To improve these issues, a Monte Carlo box localization algorithm based on RSSI(MCBBR) is proposed in this paper. In the algorithm, sampling box was constructed through RSSI...
An application of using time of flight (TOF) to measure distance between two wireless sensor network (WSN) nodes is explained. Both nodes are identical smart phones. Results show a large accuracy error (106m) but with several avenues for improvement. A discussion of the results and future work follows.
The accurate node location is necessary for wireless sensor network applications in both the military and civilian areas. In this paper, we use the Cramer-Rao Bound (CRB) to verify that node localization algorithms based on received signal strength (RSS) and time of arrival (TOA) are both reasonable. The varying number of blindfolded nodes as well as the hybrid of RSS and TOA ranging methods are used...
This paper presents an investigative study of the ranging capabilities of a miniature tapered-slot UWB antenna and an analysis of the influence of the human body on the accuracy of range estimates. The study involves determining how precisely the point-to-point distance between two identical tapered-slot antennas can be deduced through the signal Time-of-Flight from the transmitting antenna to the...
A newly developed, low cost FMCW radar system for industrial applications operating in K band has been presented. The radar features interferometric capability, which gives it sub-millimeter accuracy in distance variation measurement. Moreover, the presented radar has fully embedded signal processing with real time monitoring capability, thus making the presented sensor suitable for fully autonomous...
Accurate position information enables numerous location-based applications. Wireless network localization is a promising localization technique that permits cooperation among mobile objects to enhance localization services. The allocation of transmitting power for such networks plays a critical role since it determines network lifetime, throughput, as well as the localization accuracy. In this paper,...
Recently the European Laser Timing experiment is under construction. It is an optical link prepared in the frame of the European Space Agency mission Atomic Clock Ensemble in Space. The objective of this laser time transfer is the synchronization of the ground based clocks and the clock on board the International Space Station with precision of the order of units of picoseconds and the accuracy of...
This paper presents an approach to measure distance to obstacles in a hemispherical area around an unmanned aerial vehicle (UAV). The developed system is based on an infrared depth sensor that returns data as a range image. The sensor is rotated at constant speed so that a measurements are performed at predefined angles which results with the data about distances to objects in a hemisphere around...
Network node positioning technology is one of the important supporting technologies in the practical application of wireless sensor. In order to overcome the measurement error of the least squares method for wireless sensor networks (WSNs) node affect their positioning accuracy, an improved positioning algorithm least squares(LS) is proposed. In order to obtain the optimal reference node, the algorithm...
Performing real world experiments with underwater communication is difficult and time-consuming. Input for evaluation of localization and time-synchronization derived from experiments is not readily available.
A method for tightly-coupling carrier-phase differential GPS with ultra-wideband (UWB) ranging for vehicle-to-infrastructure relative navigation is proposed. Relative position, velocity, clock errors, GPS phase ambiguities and UWB systematic errors are estimated using an extended Kalman filter. The method is tested with real data and evaluated in terms of position accuracy, GPS float ambiguity convergence,...
In this paper a new method, called modified gradient method, has been proposed for position calculation on the basis of distance measurement in indoor environment. It is shown that well known method of position calculation such as Foy is inefficient in indoor environment. In this article is also described the indoor radiolocalisation system which was used for collecting distance measurements which...
Most would agree: human vision is the most important of the five senses. Tragically many elderly people lose their vision due to incurable diseases which could have been avoided if diagnosed early enough. Fortunately some of these diseases can be diagnosed or at least have their symptoms detected with the use of simple tests. The use of smartphone or tablet applications have become common for these...
Time-of-flight echo techniques have been proposed to estimate the distance between a local and a target station over regular WiFi radio devices. Their current main shortcoming is that they are affected by severe noise components at both stations. Our aim in this work is to quantify the noise level introduced by the target in order to derive practical limits of the ranging accuracy achievable using...
This paper presents a novel method of camera parameters calibration for obstacle distance measurement based on monocular vision. In this method, resolving camera parameters have been decomposed into two linear equation sets, which has significantly reduced computing complexity and improved computing speed. The ideal pinhole imaging model of obstacle has been demonstrated, then the linear equations...
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