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Existing localization algorithms which use Kalman filter for indoor environment fix noise covariance or change noise covariance by complicated filters. Since localization system does not reflect real environment around it, fixed noise covariance makes localization system unpractical. Also complicated filters limit the applications which localization algorithms can apply. In this paper, we propose...
Event-triggered approaches to control and estimation have the sensor transmit processed information when a measure of information ‘novelty’ exceeds a threshold. Prior work has empirically demonstrated that event-triggered systems may have significantly longer average sampling intervals than comparably performing periodically triggered systems. There are, however, few results that analytically characterize...
The sign algorithm is not influenced by impulsive noise, but it exhibits slow convergence rate. Therefore, in this paper, the exponential normalized sign algorithm is proposed for system identification. The proposed algorithm is obtained from the exponential function of the L1 norm of the output error signal. The results of computer simulations proved that the convergence rate of the proposed algorithm...
In multi agent systems, a set of intelligent agents try to cooperate with each others for performing a desired task. In this paper, an adaptive fuzzy controller is proposed based on social potential functions to control and stabilize a robotic swam (i.e. a group of simple mobile robots with limited capabilities). All robots are assumed to have unknown nonlinear dynamics and the main goal of the robotic...
This paper presents the stabilization conditions for designing fuzzy controller of two-link arm robot via Linear Parameter Varying (LPV) Takagi-Sugeno (T-S) fuzzy models. With the movable supportive base, the stochastic behavior of concerned system is considered in this paper for investigating the real environment. As mentioned above, combining the LPV system with T-S fuzzy model can approximate better...
This paper presents a control algorithm used to control attitude and altitude of a four-rotor hovercraft developed at AIT, using sliding mode control with adaptive sliding surface technique. The craft is controlled to float in horizontal attitude at the desired heading direction and the desired floating height. The simulation results show that the proposed control algorithm can control the craft efficiently.
Wireless sensor networks (WSNs) are widely used. They are easily and rapid deployed, low cost, low power, self-organized, cooperatively collect the environmental information and realize the integration of the physical world and communication network. However, for most WSNss the open nature of the wireless medium an adversary can easily eavesdrop and replay or inject fabricated messages. Different...
Decentralized adaptive tracking problem for a simple yet typical discrete-time multi-agent system is investigated, where each agent is affected by its neighborhood agents with unknown interaction strength. In this paper, for the purpose of decentralized adaptive tracking, all agents are supposed to be smart enough with limited intelligence such that they can adopt the most simple one-step-guess (OSG)...
In this paper, expressions are derived for the steady-state and tracking excess-mean-square error (EMSE) of the complex sign regressor least mean fourth (SRLMF) adaptive algorithm. In addition, an expression for optimum step-size is also derived. Finally, it is shown that the theoretical results are consistent with the simulation results.
Masking effect is the most important problem in Noise Radars. Recently, some waveform design methods to resolve this problem have been developed, however this paper will show an important fact: 'sidelobe suppression increases the Periodicity of signal and, consequently, decreases unpredictability'. Eventually, an appropriate level for sidelobe reduction is introduced.
In this paper, a concurrent dual-band design of low noise amplifier, which could work with 3G-Exband 2.6GHz and WLAN 5.2GHz bands is presented using 0.18μm CMOS technology. The topology of the inductance degenerated cascode structure based on power-constrained simultaneous noise and input matching (PCSNIM) technique is presented. The simulated results of the circuit show that the optimized Noise Figure...
This paper presents a clear comparison between two Operational Amplifiers (OAs) based on the same structure — the classical Miller OA — but with different solutions for dealing with the right-half plane zero (RHZ) associated to it: in one case, by inserting a resistor in series with the compensating capacitor and in the other case by using a current buffer, implemented by a cascoded transistor, to...
In this work, we propose a novel algorithm to combat the clipping noise in Interleave-division multiple access (IDMA) which inherits a peak-to-average power ratio (PAPR) problem especially in large number of multiple accesses. Clipping transmission is efficiently applied to reduce the PAPR to cause the clipping noise which is a weak tradeoff [1][2] to its performance. The proposed algorithm consists...
This paper presents a system approach to the acoustic echo cancellation (AEC) problem in a noisy acoustic environment. We propose a method that makes use of the estimated near-end signal from a postfilter to further improve the AEC system performance. The cancellation performance is enhanced especially during strong near-end interference (e.g., double talk). Simulation results show that our stereophonic...
This paper focuses on a simulation research by way of combining nonlinear adaptive Kalman filter with PID control, aiming at resolving the space attitude and the PID control system for an underwater robot. The results reveal that the nonlinear adaptive Kalman filter, compared with general Kalman filter PID control system, can inhibit white noise pollution more effectively. Thus, the control effect...
In this paper, a new method to cancel the effect of the parasitic capacitance in a practical toroidal inductor has been introduced. This method is based on the topologic theory. Through the simulation of the model using this method, it is clear that after the parasitic capacitance cancellation using this method, the expression of the practical toroidal inductor is greatly improved around the resonant...
In this thesis, the statistical characteristics of ship-radiated noise are discussed. Then, a mathematical model of the noise reconstruction is established for given sea depth and straight distance. The model includes the main characteristics of ship-radiated broadband noise: the continuous power spectrum, the line spectrum, the envelope spectrum, the total radiated sound power and the sound level...
A low noise interface circuit of MEMS sensor system for ultra-low frequency signal is presented in this paper. The interface circuit in CMOS processes uses chopper technique which greatly reduces 1/f noise and offset voltage of small signal processing circuit. The circuit that has a gain of 63 is fabricated in 0.5um 2P3M CMOS process. The equivalent input noise caused by clock through and charge injection...
Shipping-radiated noise include mechanism noise, propeller noise and water-power noise. Propeller cavitation noise is the main noise when cavitation happens. While the shipping cavitation developed, the fall measure of per times frequency minished gradually in high frequency. In this paper, analyse the condition of cavitation, and establish propeller cavitation spectrum model, finally interpretation...
To solve the problem of the low speech signal quality on the FH channels with wideband rejective interference, the performance optimization of CVSD coding in the digital FH system was studied. A new CVSD demodulation arithmetic was designed based on the principle of traditional CVSD system. Then the rule for measuring the quality of speech signal was offered and presented the simulation method of...
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