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Maintaining a common notion of time among communicating nodes in mobile multihop networks is crucial to the correctness of many distributed real-time applications such as target tracking, data fusion, and environmental monitoring. Achieving both synchronization accuracy and efficiency (in terms of communication and energy overheads) are important goals of a time synchronization mechanism. While these...
Interactive Neuro-Educational Technologies (I-NET) are designed to increase the pace and efficiency of skill learning by adapting training environments to the skill levels and needs of the individuals. Advanced Brain Monitoring (ABM) explored the feasibility of integrating physiological measures into an interactive adaptive computer-based training system to facilitate mitigations, accelerate skill...
Time synchronization is the basis of real-time connecting in distributed battle simulation systems, which is an important issue for battle simulation. The time management of HLA and approaches of time synchronization in distributed battle simulation systems are introduced, and then grounded on the analysis of time synchronization on real-time connecting, the approach of RTXTimer-based time synchronization...
The real-time on-line estimation of phasor frequency, amplitude and phase Angle makes a high request on both the accuracy and real-time of the method. In the conventional phasor measuring method based on DFT (discrete Fourier transform), data acquisition cycle was longer, the accuracy was easy to be effected by the frequency fluctuation. On the other hand, while the systems are under unbalanced operation...
It is not easy to achieve real-time video transmission testbed on WiMax, due to the lack availability of WiMax networks. This paper presents a ns-2 based emulator to evaluate the quality of multicast video services transmitted over an IEEE 802.16 wireless network. The impact of the modulation schemes and the cyclic prefix, on the throughput and video quality were discussed and the performance of the...
The key point of the existing Ethernet test and measurement is that the method needs to achieve precision clock synchronization between different terminals. In this paper, an improved method was proposed with consideration of the time drift and propagation delay, expressing master-slave synchronization as a linear relationship and inducting the line of least squares fitting algorithm that traded as...
In recent years, the popularity of compressed music files and online music downloads has increased dramatically. Today's users own large digital collections of high quality music on their computers and portable devices to be played in their homes or on the go. In addition, music videos are being offered online both for free and through monthly subscriptions, opening up the opportunity to turn the...
In view of the degree of the information is not high, the formation of the various parts as a system of “information islands” and other issues in printing and dyeing industry, this paper studied a control system for rotary screen printing machine multi-axis coordinated motion control as the core based on CAN bus, to enhance the multi-axis synergistic motion accuracy as the goal. A study from the following...
The mass-target real time localization system has great potential applications. However, the indoor results in a complex radio environment; the people moving results in the time vary channel; and the mass people in the monitoring area cause the interference and collision. Therefore, there is a great challenge for deploying the low cost RF devices to implement high accurate localization system. In...
In order to improve the time synchronization precision to insure the communication timely, several types of clock synchronization methods were compared, analyzed the IEEE1588 clock synchronization system, discussed the PTP system software programming, introduced some source code transplanting methods, got the root cause of the low precision, provided three major improving methods, tested the improved...
A sine signal synchronous to the power system voltage signal is required in most power electronics based industrial applications. In this study, a phase locked loop (PLL) and direct look-up table (DLT) based hybrid sine oscillator is developed, and sinusoidal signals of the desired frequency that is synchronous to the reference input signal is generated in real time applications carried out with the...
Time synchronization may play a key role in wireless sensor networks to meet real-time and energy-saving requirements and improve data-fusion and multiplexing efficiency. In this paper, we introduce a clock synchronization algorithm between the base station and sensor node used in wireless check meter system. The algorithm can not only been extended more conveniently, but also less affected by environment...
In this paper, we present black burst synchronization (BBS), a novel protocol for decentralized network-wide tick synchronization in wireless ad hoc networks, located at MAC level. We argue that tick synchronization is sufficient for multi- hop medium slotting, and that it can be used as a basis for time synchronization. BBS is based on the exchange of synchronized tick frames, which are protected...
A high bandwidth critical path monitor (1 sample/ cycle at 4-5 GHz) capable of providing real-time timing margin information to a variable voltage/frequency scaling control loop is described. The critical path monitor tracks the critical path delay to within 1 FO2 inverter delay with a standard deviation less than 3 FO2 delays over process, voltage, temperature, and workload. The CPM is sensitive...
Instantaneous frequency and time-delay measured accurately are important technologies for high precise underwater positioning. In order to prevent the leakage interference from other frequency channels, variability of instantaneous frequency sequence (VIFS) calculation and frequency estimations were adopted. The synchronous positioning model (spherical) combined with asynchronously model (hyperbolical)...
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