The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In a highly dynamical environment, such as robotic soccer, robots must in real-time make its next position to intercept the fast moving target as quickly as possible, and with obstacle-avoidance. This paper describes a computationally inexpensive, yet look-ahead intercepting method for mobile robots. The linear trajectory of the target's motion was achieved by least squares fit, the ellipse was established...
In this paper, we propose novel adaptive function expansion recursive least square (RLS) algorithms, which can dynamically choose filter channels for coefficient updates for nonlinear active noise control while still maintaining the compromised performance degradation for nonlinear active noise control. The algorithms are developed based on a multi-channel structure using a channel selection scheme...
In this paper, the VHDL implementation of an intelligent navigation system using hybrid fuzzy controllers has been proposed. Two parallel fuzzy logic controllers are utilized to conquer the major mobile robot navigation challenges in narrow concave U-shaped obstacles, and deep narrow passage, and to track a target in an environment with varying obstacles. The results demonstrate the suitability of...
A noise suppression method is given to process the output signal of fiber optical gyro. In this method, instead of the Mallat algorithm in the traditional wavelet transformation, the lifting scheme was used in the translation-invariant algorithm to improve the computation structure. Theoretically, the new method would reduce the calculating time and improve the accuracy. Experimental results showed...
In this paper, an improved source adaptive fixed-point algorithm for independent component analysis (ICA) is presented. This algorithm is based on solving the estimating equation through fixed-point algorithm. To achieve the source adaptivity, the density functions as well as their first and second derivatives are estimated by a modified kernel density method. The experimental results confirm the...
A novel parameter adaptive estimation method based on improved ellipse fitting model is proposed to calibrate the interference error by using GPS heading reference. A process is developed with estimating accurate parameters base on LMS adaptive algorithm. The experimental results show that compensation result of this method is better. It enables the digital magnetic compass realize automatic error...
In this paper, basing on the statistical features of the image, we propose a modified adaptive median filter (MAMF) for removal of impulse noise, especially for the high-density impulse noises. To avoid the shortcoming of the adaptive median filter (AMF) and the adaptive threshold median filter (ATMF), this method has been designed by combining the AMF with the Decision-Based Algorithm (DBA). From...
This paper studies the discontinuous stabilization control of wheeled mobile robots with the actuator dynamics being considered. On the basis of polar coordinate representation and backstepping technique, control law designed for the kinematic model is backstepped into dynamic model and furthermore actuator dynamics is involved, asymptotic convergence of the closed-loop system is guaranteed by the...
Divergence of traditional Kalman filtering will happen while observation or system noise does not accorded with hypothesis and H∞ filtering has not enough precision although robustness, so the popular style is the mixed H2/H∞ filtering. Aiming at the problem, this paper puts forward a kind of filtering way which mixes filtering mode using a weighted combination of the H2 and H∞ gains without creating...
Step-size is the most important parameter in LMS adaptive algorithm, which directly influences the performance of adaptive filter. In this paper, filter parameter is theoretically calculated and subsection various step-size (SVSS) is introduced to improve stability of adaptive filter. Simulation results indicate that the new method of SVSS can solve well the contradiction between convergence rate...
The AC-excited doubly-fed induction generator (DFIG) has become one of the main generators in variable speed constant frequency (VSCF) wind power generation systems. The wind turbine model and the dynamic mathematical model of DFIG are derived. The control of the rotor current inner loop and the rotating speed outer loop are designed based on internal model control (IMC) strategies, respectively....
During the target detection of the airborne pulse Doppler (PD) radar, a 4D measurement comprised of range, azimuth, elevation and radial velocity can be obtained to track the target exactly. But the factors including the Doppler blind zone (DBZ) would result in discontinuous measurements which breaks the continuity of the target track. To be consistent with the practice, we constitute the 3D relative...
Dynamic voltage restorer (DVR) is widely applied to industry because it can reduce the impact of voltage disturbance to sensitive loads. The three detecting methods to extracted distortion components of DVR based on Hilbert transform, wavelet transform, and the instantaneous reactive power theory produce are introduced in details, respectively. Comparisons of working performance among these difference...
Null Space Pursuit (NSP) is a new operator-based algorithm of adaptive signal decomposition without need for a priori bases, and signal is modeled as a superposition of local narrow band signals. Little attention has been paid to NSP decomposition performance at this stage. Here with a simplest model of two-tone signal, NSP decomposition performance was investigated. To measure the quality of decomposition,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.