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A significant attention has been paid to networked control systems (NCS) during the last few years, but few researches take the uncertainty of the controlled plant into account. This paper investigate the robustness of networked control systems with in model parameter perturbation and external disturbance. For robustness of networked control systems with uncertainty, an improved networked predictive...
Rain rate and rain attenuation for the satellite communication signals in Ku band are analyzed and simulated. They are also measured simultaneously by using a rain gauge and spectrum analyzer. Moreover we studied the relation between rain rate and rain attenuation and compared the result with the estimated International Telecommunication Union Radio Communication Sector. The difference between the...
Instability characteristics of a shipborne satellite communication station tend to reduce the tracking accuracy and communication quality. To improve the system performance, an antenna servo controller based on DSP is developed in this paper. For the servo system, a new algorithm based on the exponential trending rule discrete sliding mode variable structure algorithm is proposed. The theoretical...
Current distribution An image method combined with the image theory and the moment of method is proposed by using the modified reflecting coefficients of surface impedance, to analyze the input impedance of the antennas on different grounds media. The calculated data is compared with the measured data. After analysis and simulation, conclusion is drew that the radiation efficiency of the vertical...
To the information-based development of ship, a regional-based network architecture of ship integrated platform management system (IPMS) is proposed. The Networked and quantized control systems (NQCS) of fin stabilizers under IPMS is investigated. When transmission rate restriction of network is considered, a novel fuzzy quantized encode method is proposed. And the control strategy under these encode...
The packet losses problem of networked control systems is investigated in this paper. When packet losses occur between controller and actuator, a new lossy packet networked control system model is proposed. Motivated by predictive functional control arithmetic, predictive functional controller and packet predictive compensator are designed under this model. The corresponding compensation strategy...
Radiation efficiency of antenna at radio frequency may be changed obviously by different grounds under them. Using the modified reflect coefficients of surface impedance, an image method combined with the MOM is proposed to analyze the input impedance of the antennas on different grounds media in this paper. By comparing the calculated data with the measured data, a conclusion is drew that at very...
Base on the image theory and the moment of method (MOM), an image method is proposed to analyze the input impedance of the antennas on different grounds media, using the modified reflect coefficients of surface impedance. By comparing the calculated data with the measured data, a conclusion is drew that the radiation efficiency of the vertical antennas at very low frequency (VLF) may be changed obviously...
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