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The distributed synchronization control problem of multiple quadrotor aircraft in the form of leader-follower structure is considered in this paper. Based on the method of backstepping design, a novel distributed consensus control algorithm is proposed. Firstly, for the position control subsystem, by Proportional-Differential control and the theory of communication topology graph, a consensus control...
A time synchronization algorithm for hidden mobile node (HMB), which can only receive signals, joining an existing synchronized underwater Acoustic (UWA) sensor network (UASN) is proposed. In order to obtain the location of the HMB or communicate with it, the local time of the HMB should synchronize with the UASN. However, the propagation delay in UWA channels could not be ignored compared to electromagnetic...
This paper studies the transmission synchronization (TS) problem among multiple coupled chaotic systems by considering unknown parameters. In the solving process, we firstly select a special integral sliding surfaces, and then we develop an effective controller with the compensation terms to guarantee the asymptotical stability of all TS error systems. Simultaneously, we design the proper adaptive...
A sliding mode control approach is proposed to synchronize a class of delayed neural networks in a finite time, where the mismatched parameters and neuron activation functions are taken into account. In the controller design, a sliding mode manifold is directly defined by the synchronization error, which greatly reduces the synchronization time. Its concise design process and its ability to synchronize...
This paper proposes a distributed 3D pose synchronization law to achieve a common pose with a desired trajectory for a group of quadrotors. The dynamics of networked quadrotors is first derived, and a pose synchronization scheme is proposed. In the present controller design, linear approximation and passivation techniques are employed, which respectively enable to independently handle the yaw angle,...
The leader-following consensus problem for linear discrete-time multi-agent systems subject to static networks has been studied in the literature using H∞ Riccati inequality design and H2 Riccati equation design, respectively. However, these methods involve some less tractable conditions and need to solve some type of Riccati equation or inequality. In this paper, we further study the leader-following...
We present new methods of simultaneously estimating camera geometry and time shift from video sequences from multiple unsynchronized cameras. Algorithms for simultaneous computation of a fundamental matrix or a homography with unknown time shift between images are developed. Our methods use minimal correspondence sets (eight for fundamental matrix and four and a half for homography) and therefore...
This paper addresses the problem of spatio-temporal alignment of multiple video sequences. We identify and tackle a novel scenario of this problem referred to as Nonoverlapping Sequences (NOS). NOS are captured by multiple freely panning handheld cameras whose field of views (FOV) might have no direct spatial overlap. With the popularity of mobile sensors, NOS rise when multiple cooperative users...
In this paper, finite-time synchronization (FTS) problems in an array of unified chaotic and hyperchaotic systems are mainly studied using some important control methods. First, FTS and finite-time transmission synchronization (FTTS) for N systems are realized in a finite time by designing the effective control schemes, and the stability criteria can be given. The corresponding examples are presented...
In this article, we study finite-time synchronization of complex network with unknown parameter by applying a new type of sliding form controller. On account of the theory for finite-time control, we introduce a new type of sliding form surface. We testify that the system converge to the zero point in a given finite-time. Then we propose a sliding form controller which guarantee that the sliding movement...
For the problem of the synchronization between two chaotic systems with external disturbances and nonlinear input, based on the Lyapunov's stability theory and combined the finite time principle with control technology existed, a sliding mode controller was designed by a new type of sliding surface and the corresponding control rule of sliding mode selectivity to achieve the synchronization control...
This paper proposes a method for reconstructing 3D ball trajectories by using multiple temporally and geometrically uncalibrated cameras. To use cameras to measure the trajectory of a fast-moving object, such as a ball thrown by a pitcher, the cameras must be temporally synchronized and their position and orientation should be calibrated. In some cases, these conditions cannot be met, e.g., one cannot...
In this study a numerical cryptanalysis of a random number generator (RNG) which is built on a continuous-time chaotic oscillator is introduced. In order to scrutinize the security weaknesses of the RNG, a master-slave synchronization approach is presented as the basis of an attack scheme. By proposing this attack scheme, it is aimed to verify whether there exist any possibility to divulge the hidden...
Crustal movement is a key factor affecting water cycle and related land surface processes. In this paper, the principle of a class of crustal movement simulation system (CMSS) is introduced. The CMSS proposed in this study is composed of twelve sets of four-legged parallel manipulator with three degrees of freedom. The structure of the parallel manipulator with actuation redundancy is analyzed. In...
A new simple two-transistor four-dimensional (4D) chaotic oscillator is proposed using two sub-circuits, i.e. a modified single-transistor Colpitts oscillator, and another singletransistor sub-circuit for the fourth dimension. The circuit is much simpler than two existing two-transistor 4D chaotic circuits, as it has only nine electronic components, and only eleven algebraic terms in the state equation...
The problem to rectify and optimize distance measures from satellites in GNSS devices has been thoroughly explored in many researches. Instead there is not much information on available procedures to replicate the observed errors. The replication of GNSS errors can, in fact, be useful in many traffic simulation scenarios to test for ITS performances. The purpose of this article is to present cases...
The approach of programmed trajectory motion control (PTMC) is proposed for stabilization of synchronous generators after short-circuit faults followed by islanding and for further synchronization of islanded system with the main grid. This approach is especially useful for small size synchronous machines connected to distribution grid. Integrated solution of both stabilization and synchronization...
In this study, we investigate the feasibility of detecting small intruder aircraft through camera images obtained onboard a small unmanned aircraft. The research group (Small Unmanned Aerial Vehicle Laboratory) from NASA Langley Research Center flew a set of missions with their small UAS (sUAS) where one of those vehicles is outfitted with three 4K resolution cameras located at the tips of the wings...
Micro aerial vehicles, such as multirotors, are developed for applications like autonomous monitoring, inspection, and surveillance. Most of the current application scenarios assume a stationary environment and thus, trajectory generation rehes on static targets. In this paper, we address time-optimal trajectory generation in dynamic environments, e.g., for landing on a moving platform. We extend...
The synchronization problem of a general complex dynamical networks is studied in this paper. Sampled-data feedback controllers with event triggered mechanism are designed to synchronize the complex network. The event in this paper is formed as a kind of monotone non-increasing threshold function. According to Lyapunov stability theory, quasi-synchronization can be reached, and the error level is...
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