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The evolution of industrial communication inexorably moves towards Ethernet based networks. One important reason for using Ethernet at the shop floor is to participate on the continuous advancements of standard Ethernet. In contradistinction to the star topology, used commonly in home and office networks, in the industrial automation most common network structure is line. It is due to the fact that...
The accuracy level achievable with a given synchronization system is straightforwardly related to timestamp accuracy. Therefore, different methods have been proposed in the literature for reducing measurement uncertainty in synchronization systems. However, another important problem is deciding whether a received time information is trustworthy, particularly when timing messages generated by a supposedly...
Clock synchronization for professional video broadcasting imposes new requirements on the Precision Time Protocol which have not received much attention until now: Extremely short lock times of PTP slave nodes. This paper presents techniques for fast locking together with extensive measurements of lock time behavior in congested networks using different types and generations of network elements. Additionally,...
A broadband YIG tuned oscillator (YTO) frequency sweeping signal generator based on the DDS-PLL method is introduced. A linear sweep frequency sinusoidal signal generated by DDS is used to a reference signal of the YTO PLL (Phase-Locked Loop), and the other input of PLL is the linear frequency sweep signal of the YTO, the resulting error correction signal drives the YTO FM coil. Error correction signal...
Femtocell is a small sized indoor basestation to increase the coverage and capacity. Femtocell is connected through broadband backhual to the IEEE1588 to synchronize and manage the network. Due to limited/poor connectivity femtocell suffers by frequency misallignment and clock differencs. To overcome this problem MS-Assisted Receiver-Receiver Time Synchronization Strategy has been proposed. But this...
The scale factor balance loop is the key part in the rotating accelerometer gravity gradiometer. The digitization of the balance loop can provide lower noise and higher reliability, and also reduce the size and the weight. The design with the high performance 20-bit digital-to-analog converter AD5791 is introduced in this paper. A floating-point 32-bit digital signal controller TMS320F28335 is used...
An adjustable pulse module with FPGA-based 0.1 ns resolution is designed, which has the function of simultaneously generating multi-channel pulse. Various pulses time delay can be adjusted each other. Therefore it can improve the small target RCS (radar cross section) test accuracy under the complex environment. At present, the technology is successfully applied to a RCS tester.
Impulse-Radio Ultra Wideband (IR-UWB) is a promising technology for indoor localization due to its robustness against multipath interference. In this paper, to deal with the synchronization requirement among anchors in traditional time-difference-of-arrival (TDOA) localization, which is difficult to achieve, an asynchronous time-difference-of-arrival (TDOA) localization method is proposed. The theoretical...
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...
IEEE1588 standard Precision Time Protocol (PTP) is proposed to solve the high precision time synchronization problems in the application field. This technique will be ported to LINUX + inhibits PTP program POWERPC platform, makes it with the support of hardware timestamp of 100 ns level timing accuracy. We tested and analyzed software and hardware timestamp that affects the performance of GPS clock...
The Carrier Phase Measurement (CPM) of GPS may achieve high precise location because of its short wavelength. While when a moving object comes into an enclosed area, GPS signal will be limited. For this paper, we propose a new indoor positioning model which aims to achieve cm-level indoor location by using CPM method. One of the most important parts of this model is to extract the most accurate carrier...
Group audience responds collectively to a stimulus unlike an audience. Total group arousal is formed by exchanging emotional effects with surroundings. Empirical approaches are not enough by comparison to various theoretical approaches related to group arousal. Thus we have preceded the study for empirical group arousal measurement based on movement synchronization of group. At first, we measure that...
Wireless Body Area Networks (WBANs) can take advantage of many wireless protocols. Among them, Bluetooth is a good candidate since its widespread adoption guarantees compatibility with a number of devices and significantly reduces development time. In most cases data collected from different sensors on different nodes need to be synchronized. We present a synchronization protocol that makes use of...
Indoor navigation using inertial sensors with additional radio-signal support is considered in this paper. The experimental results of data fusion between a navigation system, based on inertial measurement unit (IMU) and impulse-based UWB localization system, are presented. The IMU is additionally supported by a pedestrian step length estimations, barometer and electronic compass. The Ultra-Wideband...
Optical wireless communication has emerged as a promising complementary technology for Radio Frequency technology. Reliability and survivability of solid state lighting devices has attracted researchers and is gaining attention as they provide synergistically illumination and communication. Furthermore optical wireless communication is environmental friendly and also helps in energy conservation....
Most of the researches in synchronization of audio and text have been focusing on the synchronization at the level of utterance. However, to generate audio books in unstructured language like Thai from live speech, a finer level of synchronization is necessary. We propose an algorithm to synchronize live speech with its corresponding transcription in real time at syllabic unit. The proposed algorithm...
This paper deals with the synchronization of the measurement instruments cooperating in the distributed measurement system interfaced to the network node by wireless devices, Personal Digital Assistants or PC. The different hardware and software architecture of the wireless devices and PCs delays the triggering of the measurement instruments in unpredictable wide range that introduces a new problem...
With the rise of Global Navigation Satellite Systems (GNSSes), accurate outdoor localization has become a widely-used service in our daily lives. Yet, most indoor localization systems are not able to deliver a similar performance due to typical multipath environments causing scattering and diffraction of the received signal. Depending on the amplitudes, phases, and delays of the multipath components,...
Sampling is a well-known workload reduction technique that allows one to speed up architectural simulation while accurately predicting performance. Previous sampling methods have been shown to accurately predict single-threaded application runtime based on its overall IPC. However, these previous approaches are unsuitable for general multi-threaded applications, for which IPC is not a good proxy for...
A common practice for reducing synchronization overheads in parallel simulation of a large-scale cluster is to relax synchronization with lengthened synchronous steps. However, as a side effect, simulation accuracy degrades considerably. This paper proposes a novel mechanism that keeps the running speeds of different nodes consistent by synchronizing logical clocks with the wall clock periodically...
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