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Target Localization by Resolving the Time Synchronization Problem in Bistatic Radar Systems Using Space Fast-Time Adaptive Processor

D. Madurasinghe, A. P. Shaw
2009 EURASIP Journal on Advances in Signal Processing  
An array-based space-fast time adaptive processor is implemented in order to estimate the path difference between the direct signal and the delayed signal, which bounces off the target.  ...  The technique does not depend on the use of communication satellites or GPS systems, instead it relies on the availability of the direct transmit copy of the signal from the transmitter and the reflected  ...  EURASIP Journal on Advances in Signal Processing  ... 
doi:10.1155/2009/426589 fatcat:ssw6ahxxmzhr3op6t5l7owcrp4

Design of State Feedback Current Controller for Fast Synchronization of DFIG in Wind Power Generation Systems

Ahmed G. Abo-Khalil, Ali S. Alghamdi, Ali M. Eltamaly, M. S. Al-Saud, Praveen R. P., Khairy Sayed, G. R. Bindu, Iskander Tlili
2019 Energies  
The proposed controller is designed using a multivariable system and feedforward control for input reference and incorporating disturbances into the control equations for fast synchronization and transient  ...  In this study, we focused on improving DFIG synchronization to the grid by applying state feedback current controllers with a feedforward component to smooth the connection to the grid, as well as to improve  ...  The proposed method guarantees a fast and soft reconnecting of the system at any speed and with null current.  ... 
doi:10.3390/en12122427 fatcat:slxhiuearjfsveirwvadclseey

Synchronization on fast and slow dynamics in drive-response systems

Liang Wu, Shiqun Zhu, Juan Li
2006 Physica D : Non-linear phenomena  
Two types of synchronization, Achronal Synchronization and Isochronous synchronization are investigated numerically when unidirectionally coupled laser systems are considered both on fast and slow dynamics  ...  are in a good agreement, which most probably suggests that the observation based on detections on slow dynamics is of importance when it is the only choice as detection on fast dynamics is usually extremely  ...  In contrary, a minus value of P I − P A would indicate Achronal Synchronization is the one ruling synchronization behavior of the system .  ... 
doi:10.1016/j.physd.2006.09.006 fatcat:fola6qqxgnhorm5lliilitf32y

Time-Delay Effects on Synchronization of Coupled Slow-Fast Systems

Yuanguang Zheng, Jianjian Zeng
2021 Journal of Applied Mathematics and Physics  
Time-delay effects on synchronization features of delay-coupled slow-fast van der Pol systems are investigated in the present paper.  ...  Then, the impact of time delay on the structure of the slow manifold of synchronized system is obtained by using the method of stability switch, and thus, time-delay effects on synchronization features  ...  Synchronization of delay-coupled slow-fast systems has also been studied in literature [40] [41] , an important finding is that the delay-coupled slow-fast systems can get synchronization in large  ... 
doi:10.4236/jamp.2021.94046 fatcat:s2el6lr4x5fobljjvq5k2fqesa

Synchronization of fluctuating delay-coupled chaotic networks

Manuel Jiménez-Martín, Javier Rodríguez-Laguna, Otti D'Huys, Javier de la Rubia, Elka Korutcheva
2017 Physical review. E  
Moreover, we observe characteristic oscillations, with a periodicity related to the coupling delay, as the system approaches or drifts away from the synchronized state.  ...  Synchronized states appear to be maximally stable when fluctuations are much faster than the time-delay, even when the instantaneous state of the network does not allow synchronization.  ...  Despite having < * , the system synchronizes in the fast fluctuations regime.  ... 
doi:10.1103/physreve.95.052210 pmid:28618497 fatcat:evx4vjylzragpdag7vflgzac3y

Fast Frequency Control of Low-Inertia Hybrid Grid Utilizing Extended Virtual Synchronous Machine

Rasool Heydari, Mehdi Savaghebi, Frede Blaabjerg
2020 2020 11th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)  
Fig. 4 . 4 System frequency and the active output power of a synchronous condenser (P SC ) and a power converter (P SC ) controlled as the VSM without the FFR control loop.  ...  In this paper, VSM control is extended to have a fast frequency response while providing inertia for the system.  ... 
doi:10.1109/pedstc49159.2020.9088504 fatcat:ffrxz2aoffddrk6bg6xqkabryi

Fast fixed-time synchronization of T–S fuzzy complex networks

Shuai Liu, Lingli Zhao, Wanli Zhang, Xinsong Yang, Fuad E. Alsaadi
2021 Nonlinear Analysis: Modelling and Control  
In this paper, fast fixed-time (FDT) synchronization of T–S fuzzy (TSF) complex networks (CNs) is considered.  ...  By constructing comparison system and applying new analytical techniques, sufficient conditions are established to derive fast FDT synchronization speedily.  ...  FDT synchronization 3.1 Fast FDT synchronization In this section, via the designed fuzzy controllers, fast FDT synchronization are derived. Moreover, we also give some comparisons. Theorem 1.  ... 
doi:10.15388/namc.2021.26.23060 fatcat:ubrtg5b3tvbihp7dqivo4fcjmi

A Cross Coupling Control Strategy for Dual-motor Speed Synchronous System Based on Second Order Global Fast Terminal Sliding Mode Control

Changlin Zhu, Qunzhang Tu, Chengming Jiang, Ming Pan, Hao Huang
2020 IEEE Access  
In addition, the concept of fast arrival is also used in the arrival phase [33] .  ...  The structure diagram of dual motor speed synchronous control system is shown in Fig.2 . A.  ...  Experimental results show that the 2-SMC strategy is faster than the CCC strategy in response speed, while the CCC strategy is better than the 2-SMC strategy in synchronization accuracy.  ... 
doi:10.1109/access.2020.3042256 fatcat:wxv7vs6t45aa5gen4q4wxrstqe

Dynamical networks with on-off stochastic connections: Beyond fast switching

Russell Jeter, Igor Belykh
2014 2014 IEEE International Symposium on Circuits and Systems (ISCAS)  
We also discuss the advantages of slower switching over fast switching, and consider an example in which slow switching provides opportunities for network synchronization while fast switching does not.  ...  It is shown that there is an optimal window in which the switching frequency causes an unstable system to stabilize.  ...  having an edge in the stochastic system, ε * 1 = ε * p (see Fig. 3 ).  ... 
doi:10.1109/iscas.2014.6865503 dblp:conf/iscas/JeterB14 fatcat:7wnpb3mapnawjeggbnphlyloji

Overcoming network resilience to synchronization through non-fast stochastic broadcasting

Russell Jeter, Maurizio Porfiri, Igor Belykh
2018 Chaos  
system spends more time in a state favorable to synchronization.  ...  In this paper, we examine the feasibility of on-off broadcasting from a single reference node to induce synchronization in a target network with connections from the reference node that stochastically  ...  One's intuition would suggest that fast-switching between the stable and unstable states of controlled synchronization with probability (p > 1/2), that makes the system spend more time in the stable state  ... 
doi:10.1063/1.5044420 pmid:30070517 fatcat:r32nznbajrfibdeqx6lrofurmm

Effect of Small-World Connectivity on Fast Sparsely Synchronized Cortical Rhythms [article]

Sang-Yoon Kim, Woochang Lim
2014 arXiv   pre-print
When passing a small critical value p^*_c (≃ 0.12), fast sparsely synchronized population rhythms are found to emerge in small-world networks with predominantly local connections and rare long-range connections  ...  We first employ the conventional Erdös-Renyi random graph of suprathreshold FS Izhikevich interneurons for modeling the complex connectivity in neural systems, and study emergence of the population synchronized  ...  Consequently, the whole system is composed of just one single synchronized block (i.e., global synchronization occurs in the whole system), in contrast to the case of p = 0.  ... 
arXiv:1403.1034v4 fatcat:sil2466btrcpfdmzb6hzb2egde

Analysis Of A Singular Perturbed Synchronous Generator With A Bond Graph Approach

Gilberto Gonzalez-A, Noe Barrera-G
2011 Zenodo  
An analysis of a synchronous generator in a bond graph approach is proposed. This bond graph allows to determine the simplified models of the system by using singular perturbations.  ...  In order to verify the effectiveness of the singularly perturbed models, simulation results of the complete system and reduced models are shown.  ...  A BOND GRAPH MODEL OF A SYNCHRONOUS GENERATOR Synchronous generators form the principal source of electric energy in power systems, many large loads are driven by synchronous motors and synchronous condensers  ... 
doi:10.5281/zenodo.1079976 fatcat:4rnfp2736fggzp37naqmmn6q6m

Partial Exponential Stability Analysis of Slow-fast Systems via Periodic Averaging [article]

Yuzhen Qin, Yu Kawano, Brian D. O. Anderson, Ming Cao
2019 arXiv   pre-print
This paper presents some new criteria for partial exponential stability of a slow-fast nonlinear system with a fast scalar variable using periodic averaging methods.  ...  Unlike classical averaging techniques, we construct an averaged system by averaging over this fast scalar variable instead of the time variable.  ...  In particular, fast time-varying systems can always be modeled in this way since the time variable t can be taken as the fast scalar [13] .  ... 
arXiv:1910.07465v1 fatcat:bv4juwn6ynejfnxk3g6opwrh4m

Role of time scales and topology on the dynamics of complex networks

Kajari Gupta, G. Ambika
2019 Chaos  
We study the emergence of such phenomena and their transitions by considering a complex network of dynamical systems in which a fraction of systems evolves on a slower time scale on the network.  ...  synchronization etc.  ...  fast system with p 3 .  ... 
doi:10.1063/1.5063753 fatcat:n33boaacj5dkdgbqoulitnhrdm

Synchronization in time-varying networks

Vivek Kohar, Peng Ji, Anshul Choudhary, Sudeshna Sinha, Jüergen Kurths
2014 Physical Review E  
to high-dimensional systems [P.  ...  We find that the time taken to reach synchronization is lowered and the stability range of the synchronized state increases considerably in dynamic networks.  ...  In Fig. 4 we also notice that the synchronous state in fast rewiring networks is stable for coupling strengths larger than the averaged case. This is more pronounced for large p (0.8 here).  ... 
doi:10.1103/physreve.90.022812 pmid:25215786 fatcat:djuka342mnagtibj4vlnp6ggaq
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