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In this paper, we propose a positioning system using a time-synchronized wireless network that can achieve high positioning accuracy without being dependent on any global positioning system (GPS) devices with cm-level accuracy as the main goal and objective. The proposed system utilizes time of arrival (ToA) method to estimate the target's position. Based on the results, we can achieve time synchronization...
This paper aims at presenting an experimented low power Internet of Things architecture, that could be integrated to underwater monitoring systems like Autonomous Underwater Vehicles for wireless underwater sensing. The proposed hardware architecture of the sensor nodes is based on an ultra-low-power Flash Micro-controller that takes measurements from water sensors, and synchronizes the network by...
Localization of wireless networks has remained an active research topic for more than a decade, as it finds more and more applications in numerous scenarios, including environment surveillance, asset tracking, and healthcare monitoring, etc. In this paper, we consider the maximum likelihood localization of a network where some of the nodes are GPS-capable while the others attempt to achieve self localization...
Vehicular Ad Hoc Networks (VANET) are the fastchanging networks for connected vehicles, in which Vehicle- to-Vehicle and Vehicle-to-Infrastructure communication are the basis for technologies aiming at reducing accidents and improving operation. DSRC Safety Applications, designed to assist drivers in order to avoid accidents, might be subjected to malicious attacks, such as GPS time spoofing attacks,...
The use of animals, specially ovines, for controlling infesting species in crops is an ancient method that has several advantages with respect to the use of chemical and/or mechanical techniques. Shepherds required to supervise animals, are getting increasingly less available and are costly. Over the last years, technologies for automatic animal supervision have been investigated, typically including...
In this paper, we introduce Pulsar, a wireless time transfer platform that can achieve clock synchronization to better than five nanosecond between indoor or GPS-denied devices. Nanosecond-level clock synchronization is a missing capability for many real-time applications like next-generation wireless systems that leverage spatial multiplexing to improve channel capacity and provide services like...
Theoretical values of throughput and latency parameters of 3G as well as 4G mobile networks are generally known from the standards. However, in praxis they depend on various aspects like radio signal coverage, number of connected users or moving speed of the terminal equipment. In this paper we present results of measurements conducted in Vienna, Austria. They were conducted for activities of AEROCEPTOR...
In this work, an improved Precision Time Protocol (PTP) used to synchronize clocks in industrial Wireless Local Area Network (WLAN) communication systems is addressed. In order to enhance the accuracy of the PTP synchronization, we first provide an approach to remove the drift factor of frequency of crystal oscillators on the master and slave clocks without any additional message exchanges added to...
Link-16 is a widely used tactical data link system for battlefield networks. A key component of Link-16 is network time synchronization. Link-16 provides two types of time synchronization methods: global positioning system (GPS)-based time synchronization and GPS-less time synchronization. In particular, Link-16 requires relay nodes for multi-hop time synchronization. However, in Link-16, the relay...
The recent breakthrough on power grid technologies was promoted by the emergence of phasor measurement units (PMUs), as they provide direct and high-rate data for analyzing and controlling the network. Time becomes critical however, since offsets in the internal clocks of PMUs render their data unreliable. In this context, the present work describes grid-wide implementation of a Precision Time Protocol...
According to such problems as acquisition terminal and smart meter's real-time deviation is large which has lead to TOU power price and ladder power price policy difficult to successfully implement in electricity information acquisition system, this paper has applied GPS clock synchronization technology and PTP clock synchronization technology in electricity information acquisition system's simulation...
Delay is one of the main parameters in determining quality of service and topology of network. One way delay provides us with more information than that a round trip time does and it also involves more intricate calculations. In this paper, two measuring devices are designed and implemented that can measure the one way delay present between two distant points in web environment using GPS clock and...
With the development of 3G/LTE, the high precise time synchronization application used the IEEE1588v2 standard become a great demand in telecommunication. This paper firstly introduces the principle and architecture of IEEE1588v2 and the structure of Optical Transport Network (OTN). According the characters of OTN, The platform used the timing clock module is designed and analysis. Finally the practical...
This work presents a cabled system for collecting real-time seismic data on the coastal zones. It is deployed in the Western Mediterranean Cabled Observatory, OBSEA (www.obsea.es). A key component in this cabled system, COBS, is the use of IEEE standard 1588 that serves as a clock synchronization mechanism for the seismometer with Universal Time Coordinates (UTC) clock. Delivering of accurate timing...
Using a Wireless Sensor Network (WSN) for monitoring single source events, such as volcanic activity, involves many challenges. One of these challenges is that of accurate timer synchronization of the data collecting nodes, so as to ensure that there is a consistent view of the data retrieval times.
This paper investigates various forms of industrial time synchronization and attempts to apply them to Programmable Automation Controllers (PACs) for power system applications. PACs have been used in industry for many control applications, but advancements in synchronization technology has allowed for PACs to be used in high speed control and data acquisition systems. This paper looks at utilizing...
Internet services rely on communication networks to serve billions of end-users worldwide. Metrology platforms are used to assess the Quality of Service of such networks. This work reviews and classifies the existing metrology equipment and methods. In particular, we provide elements of comparison between different packet capture techniques and clock synchronisation methods, two essential building...
This paper reports a study and practical evaluation of two different clock synchronization methods for distributed measurement and control nodes based on Linux Single Board Computers (SBCs) with ARM processors and communicating through a TCP/IP wide area network. First the Network Time Protocol (NTP) is configured and evaluated in different network scenarios. The second solution is a specific development...
The synchrophasor technology has become focus of many theoretical, conceptual and practical studies lately due to an increased opportunity to improve power system reliability and security through enhanced monitoring, protection and control. The paper provides a survey of signal processing, communication and networking issues surrounding this topic so that professionals from related areas can benefit...
Abstract-The development of power system raises higher requirements for power system automation system and security infrastructure. Both the power system monitoring and control are developing toward wide-area measurement. Power System Sensor Network (PSSN) is proposed as a solution for power system security monitoring and control. The precision of time synchronization is one of the most critical factors...
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