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Algorithm for Harmonic Tidal Analysis along T/P Tracks： Taking Differences of Observed Sea Surface Heights at Adjacent Points as Observations

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Geo-Spatial Information Science 2008年第1期11卷 17-20页

作者： XU Jun BAO Jingyang LIU Yanchun YU Caixia Department of Hydrography and Cartography Dalian Naval Academy 667 Jiefang Road Dalian 116018 China 不详

An algorithm （differential mode） is presented for the improvement of harmonic tidal analysis along T/P tracks, in which the differences between the observed sea surface heights at adjacent points are taken as observations. Also, the observation equations are constrained with the results of the crossover analysis; the parameter estimations are performed at 0.1° latitude intervals by the least squares. Cycle 10 to 330 T/P altimeter data covering the China Sea and the Northwest Pacific Ocean （2°-50° N,105°-150° E） are adopted for a refined along-track harmonic tidal analysis, and harmonic constants of 12 constituents in 8 474 points are obtained, which indicates that the algorithm can efficiently remove non-tidal effects in the altimeter observations, and improve the precision of tide parameters. Moreover, parameters along altimetry tracks represent a smoother distribution than those obtained by traditional algorithms. The root mean squares of the fitting errors between the tidal height model and the observations reduce from 11 cm to 1.3 cm.

关键词： satellite altimetry T/P harmonic tidal analysis differential mode

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Design and Comparison of Controller for the Reduction of Conducted Electromagnetic Interference in an Inverter

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Circuits and Systems 2016年第7期7卷 1167-1176页

作者： P. Narasimman E. Latha Mercy Department of Electrical and Electronics Engineering Kings College of Engineering Thanjavur India Department of Electrical and Electronics Engineering Government College of Technology Coimbatore India

This paper presents the design of a controller for the measurement and reduction of conducted Electro Magnetic Interference (EMI) caused in the power electronic circuits. The conducted EMI is also separating the Common mode (CM) and differential mode (DM) simultaneously using Line Impedance Stabilization Network (LISN). EMI is mitigated by the fuzzy controller. By comparing common mode voltage with the standard reference value, the generated error can be minimized by using fuzzy controller. Fuzzy controller is varying the PWM signal of the power electronic switching devices for reducing the electromagnetic interference. In this paper, comparison of PI and fuzzy controller of the open loop and closed loop models are implemented using MATLAB® SIMULINK for measurement and reduction of the EMI level;and also simulation results of the PI controller and fuzzy controller analysis are presented in this paper. The fuzzy controller is provided to achieve the EMI level of the inverter within the standard limit.

关键词： Conducted EMI Common mode differential mode PI Controller Fuzzy Controller

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