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Based on model reference adaptive control (MRAC), a MRAC synchronous controller is designed. And the reference model of the MRAC is determined according to the linear mathematical model of the electro-hydraulic servo system. Then the synchronous controller is applied to position synchronization of two cylinders system. The experiment results show that the proposed controller can effectively reduce...
In order to implement high precision time synchronization autonomously in the absence of any external time source, in this paper, the author introduced the synchronize model of fireflies into UAV formation network, and proposed a kind of distributed time synchronization method base on broadcast, and conducted some computer simulation experiments and built one test platform to prove the feasibility...
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...
With the intention of establishing the connectivity between the femtocell and the core network, it is essential to use public network that ultimately creates several challenges for the operators. Therefore, Synchronization is considered corner stone and has become one of the most significant issues in femtocellular networks to ensure a tolerable carrier offset as well as support received signals in...
Delay mismatch between the input and output signals of power amplifiers (PAs) may lead to an erroneous assumption of memory effects. In adaptive digital predistortion (DPD) system, the delay mismatch affects the accuracy of coefficients estimation and degrades performance of the DPD system. In this paper, we reveal the impact of fractional delay mismatch, and analyze the relationship between delay...
This paper proposes an enhanced one-terminal fault-location algorithm in which its salient performance is to combine the advantage of minimal fault data requirement for standard IEEE one-terminal algorithm with the advantage of superior accuracy for two-terminal algorithm. Assuming that voltage phasor at any bus can be easily obtained, and that fault impedance can be treated with resistive characteristic,...
This short paper introduces a novel approach to improve the accuracy of the surface impedance boundary condition (SIBC) model originally reported by Celuch. The accuracy of the SIBC algorithm is significantly improved by introducing time and/or space synchronizations but still maintains a simple time update equation. Examples demonstrate the effectiveness of the approach. In addition, a ladder element...
In this paper we present chaotic synchronization of a Lorenz system using Unscented Kalman Filter (UKF). The UKF has shown to produce better results, than Extended Kalman Filter (EKF), without performing potentially ill-conditioned numerical calculations and linearly approximating the evolution of the state vector covariance. The chaotic synchronization is implemented in the presence of state and...
Wireless Sensor Network for their rapid deployment can be used in habitat monitoring for detecting fire and in disaster for helping rescue teams. Node localization is key factor for some applications. We propose the Triangular Centroid Localization algorithm (TCL). It is based in simple trigonometric figures and it does not require special hardware or synchronization time. In our simulations using...
Fast and accurate distance measurement is crucial for target tracking and node localization in Wireless Sensor Networks. For short-range Underwater Acoustic Sensor Networks (UASNs), received signal strength (RSS) can give distance between acoustic devices. An extensive study on the application of the Lambert W function over RSS for distance estimation in short-range UASNs shows that it can be done...
Although there are a lot of synchronization protocols in WSN, almost all of them face the same problem, that is, synchronization overhead has not been well controlled. The root of this problem is that they have adopted the same basic communication model- pairwise communication model. Increasing communication overhead in synchronization shortens the lifetime of the system and limits the wide application...
Practical implementations in distributed model based control face a fundamental trade-off between model complexity and the number of modeled nodes. For linear systems, higher order models better capture the behavior of the system at higher frequencies, but the effective operating frequency range is limited during implementation due to sensor/actuator bandwidth limits, control algorithm limits and,...
We present here a theoretical framework towards a fundamental understanding of the effects of value prediction. Our framework consists of two parts: first, an identification of the theoretical limit of value prediction and an indication of the potential to improve parallelism through the exploitation of value predictability; second, a demonstration of the feasibility of data prediction and a theoretical...
In wireless sensor networks (WSN), location information acquisition is critical to guarantee their performance. This paper presents the positioning methods in WSN with based on the linear frequency modulation continuous wave (FMCW) techniques. Reference nodes with known locations transmit linear FMCW reference signals, while other sensor nodes estimate their locations based on the time frequency difference...
IEEE 1588 is a standard to synchronize independent clocks running on separate nodes of a distributed measurement and control system. In PTN (Packet Transport Network), it is considered as a key technology for supporting legacy TDM services and synchronizing 3G base stations. However, conventional IEEE 1588 synchronization algorithm assumes symmetrical links, and makes errors for asymmetric links for...
In this paper, a location algorithm pattern based on fuzzy identification with multi-layer synchronization and cooperative difference is proposed to eliminate location errors and system interference caused by ambiguity distribution parameters. As the algorithm model is built to carry out fuzzy identification among faintness and ambiguity signal parameters, the location algorithm is provided with indubitable...
Traditional time synchronization algorithm focuses on improving the synchronization mechanism to improve the synchronization accuracy. With development of time synchronization, more and more focuses on how to process the synchronization information to improve the synchronization accuracy. Maximum likelihood estimation method is one of the mathematical statistics theories commonly used in parameter...
In wireless sensor networks (WSN), location information is important to ensure both performance and efficiency of WSN. This paper presents a new positioning method in WSN with reasonable implementation cost and excellent performance. Given a few beacon nodes with known locations and node range estimates based on beacon signals, all nodes' location information can be derived in a passive active mode...
An algorithm is proposed to estimate the parameters of transmission lines and transformers using synchronized phasor measurements at both ends of the element. It uses a simultaneous state and parameter estimation algorithm applied to an artificial system to find the parameters of the line or transformer. A number of successive data sets can be used to improve the accuracy of the estimation. The method...
Acoustic target tracking is one of the application areas of wireless sensor networks (WSNs) in which time synchronization error influences the results of target tracking. Algebraic numerical methods are used to solve simultaneous equations of target tracking. A more efficient approach is to use algebraic geometry for solving simultaneous equations of target tracking, but the analytic study of error...
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