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The research deals with the synchronization of the signals to trigger Measurement Instruments (MIs) cooperating in the distributed measurement system. Due to the hardware and software architecture of the Trigger Generator (TrG) common available (es. PC), the signal is received by MIs with random delay. Solution based on Embedded Synchronizing Hardware (ESH) was proposed to ensure synchronization accuracy...
Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Moreover, it is able to offer accurate localization in the range of few centimeters. Regarding these qualities, it is desirable to design a IR-UWB transceiver which consumes as few power as possible when it is applied for battery driven wireless sensors...
Wind turbines are rapidly increasing and some times are disconnected from the grid intentionally or inadvertently and continue to supply local loads. If it was decided to reconnect to the grid, some problems may happen. This paper deals with the reconnection of islanded wind turbines to the grid and proposes a new method to reduce the high current effects of reconnection. The new method is simple...
ICx Radiation, Inc. has implemented a novel timing method for use in a Compton telescope that is capable of nanosecond timing resolution. A critical task in Compton telescope design is to minimize the timing variance between detectors in a large array in order to reduce the background. The voxelSPEC has been developed to combine precise timing with pulse processing electronics in a single device,...
The IEEE 1588 standard is widely established and accepted for clock synchronization in Ethernet networks. High accuracy IEEE 1588 implementations require a well-coordinated hardware/software co-design. Processing of sophisticated control algorithms for the time speed of local clocks within synchronization slaves are particularly important. Hence, IEEE 1588 implementations should be tested with respect...
IPsec is one of the most widespread protocols to establish secure communication for the Internet Protocol. Besides the fact that this protocol is fully integrated in the Internet Protocol suite, the main advantage of using secure tunnels for IEEE 1588 clock synchronization is the reduced maintenance effort. Instead of requiring, e.g., different key management or connection setup protocols for each...
This paper describes the experience from the world first installation of High Voltage substation with IEC 61850 Process Bus where IEEE 1588 Time Synchronization and dynamic multicast filtering have been used. The authors provide brief introduction to the concept of digital substation and process bus, then provide overview of IEEE 1588 standard for precise time synchronization and finally describe...
With the development of ethernet technology, the requirement of time synchronization is becoming higher and higher on the distributed ethernet monitoring system. According to the requirement of bridge structure monitoring system, the distributed solution based on IEEE1588 protocol is presented after the research of IEEE1588 protocol and the explanation of principle on high precision synchronization...
Position messages will be the foundation for many emerging traffic safety applications based on wireless communications. These messages contain information about the vehicle's position, speed, direction, etc. and are broadcasted periodically by each vehicle. The upcoming IEEE 802.11p standard, intended for vehicle ad hoc networks (VANETs) has flaws caused by the unpredictable behavior of its medium...
This paper presents an IEEE 1588-2008 adapter that provides existing Gigabit Ethernet equipment with the functionalities required to clock synchronization on the order of sub-microsecond. To compensate the time error caused by the queuing delays in the Gigabit Ethernet equipment, the adapter measures the residence time and runs the peer delay mechanism for the equipment. Major functional blocks including...
In this paper, the performance evaluation of the Mesh-based PHY of IEEE 802.16e standard (a.k.a Mobile WiMax) for above the sea propagation is presented. For a Mesh OFDM system, the independent bursts transmission among different communicating nodes compels the receiving nodes to perform frame locking using the preamble with size of only one OFDM symbol interval, short preamble length is used in favour...
White Rabbit (WR) is the project name for a ambiguous project that uses Ethernet as both, deterministic (synchronous) data transfer and timing network. The presented design aims for a general purpose, fieldbus like transmission system, which provides deterministic data and timing to approximately 1000 timing stations. The main advantage over conventional systems is the highly accurate timing (sub-nanosecond...
When using network synchronization protocols like IEEE 1588 or NTP, a common approach to increase the performance is to add hardware support for timestamping the essential synchronization messages. Further, timestamping accuracy and the stability of the local oscillator of a network synchronized node are the two main influence factors for high accuracy clock synchronization. While the latter is subject...
We study a performance improvement technique for the IEEE 1588 time synchronization system for Ethernet mobile backhaul. We propose and demonstrate the queuing delay estimation method by using dedicated probing packets to mitigate time synchronization deterioration caused by queuing delay in a packet switch. The demonstration results by numerical simulation show that the proposed method is effective...
This paper presents the different tradeoff in implementing IEEE1588 on top of HSR by evaluating the different alternatives offered by the time synchronization protocol. The evaluation is based on the accuracy of the achieved synchronization, its complexity and its conformance to the HSR protocol. While HSR and IEEE1588 seem to be promising candidates for substation automation communications, their...
This paper presents test results from several IEEE1588 Transparent Clocks (TC) under realistic network conditions. Imperfections are documented that may impact the end-to-end synchronization performance between Master Clocks (MC) and Slave Clocks (SC). To help service providers select and configure these devices to meet their synchronization performance needs, a new test methodology for characterizing...
Based on the IEEE 1588, a Prediction-based Fairness Control (PFC) algorithm is proposed. It improves the real-time performance of star topology industry control Ethernet. The channel load is detected by delay measurement. Data flow is regulated according to the whole channel load. The main functions of this algorithm are as follows: controlled nodes are controlled to guarantee the communications of...
Wireless sensor networks are evolving from relatively undemanding applications to applications which have stronger requirements. The coordination of distributed entities and events requires time synchronization. Although a number of methods have been studied for WSNs, some applications require high precision time synchronization. Precision time synchronization enables a variety of extensions of applications...
In this paper we analyze the efficiency of scanning process on handover procedure in IEEE802.16 m. Since the .16 m is still under development, the performance evaluation is based on current running standard of 802.16 e. We consider four scan types and evaluate the average scanning time required. In addition, four different handover strategies are utilized to analyze the handover interruption time...
Ranging is strongly dependend of an accurate estimation of time-of-arrival (TOA), which requires fine temporal resolution. Ultrawide band (UWB) pulses fulfill this requirement, but the pulses are spread in time by multipath propagation. The major concern in ranging therefore is a proper detection of the leading edge. The IEEE 802.15.4a standard defines a way of TOA-based ranging with coding gain by...
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