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Automatic estimation of symbol parameters plays a prominent role in electronic reconnaissance and electronic warfare systems. How to estimate the code width without prior knowledge is an important problem in modulation recognition. Hilbert transform can effectively extract the instantaneous mutation characteristics of digital communication signals. In this paper, in order to demodulate MPSK underwater...
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...
In this study, an improved equipment effectiveness evaluation method based on the cloud theory was proposed to remedy the deficiency in the existing cloud evaluation methods. And the evaluation process was designed: got the index cloud model by the reverse cloud algorithm, determined the weight cloud model by the improved formula weighting method, obtained the system effectiveness cloud model by the...
To extract a tubular object boundary from a volumetric image is important to compute its morphometric properties, like the estimation of the boundary curvature, or the radius of a tubular object, for example, the radius is one of the descriptions of blood vessel for detecting the soft plaque. How to estimate the gradient of the volumetric data has an influence on the computation results of the morphometric...
Ship is maneuvering in a complex environment, studies showed that chaotic state appeared when ship steering. This movement easily leads ship out of control or off course, and also affects the special deck operations and even endangers the ship's own security. In order to achieve the purpose of controlling chaotic ship steering, a method based on improved double-pulse parameter perturbation is presented...
For the difficulty of tuning the PID controller parameter to control a complex chaotic system, in order to overcome the shortage of basic particle swarm optimization, this paper improves the inertia weight and introduces the uncontrolled chaotic system into the PSO algorithm, proposes the improved dynamic chaos particle swarm optimization algorithm. This paper applies the algorithm to the chaos PID...
evaluating the education value of video games is a complex task. Based on the educational evaluation system for video games, we establish a corresponding automated evaluation model using the Back-propagation (BP) neural network technology. After training with the expert knowledge, the model not only has the experience of experts, but also has the computational capacity to evaluate new cases.
The single machine infinite bus system excitation control of power system is discussed in this paper. A nonlinear equivalent sliding mode controller and adaptive sliding mode controller are designed based on the theory of sliding mode variable structure control and stability analysis is included. The proposed design approach enables to compensate the inherent nonlinearities of the generator and to...
A hierarchical overlay structure is an alternative solution that integrates existing and future heterogeneous wireless networks to provide subscribers with better mobile broadband services. Traffic loss performance in such integrated heterogeneous networks is necessary for an operator's network dimensioning and planning. This paper investigates the computationally efficient loss performance modeling...
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