Browsing Elektrik - Elektronik Mühendisliği Bölümü by Issue Date
Now showing items 1-20 of 353
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Spectroscopic Investigation Of Onset And Enhancement Of Electrical Conductivity In Pvc/Pani Composites And Blends By Gamma-Ray Or Uv Irradiation
(Amer Chemical Soc, 1998)Electrical conductivity of blends and composites of poly(vinyl chloride) (PVC) with nonconducting polyaniline (PANI) increases when they are subjected to gamma-rays or UV radiation. This is attributed to a radiation-induced ... -
A New Algorithm for High-Quality Ionogram Generation and Analysis
(Amer Geophysical Union, 2002)Standard digital ionograms that are generated by fast Fourier transform or autoregressive modeling suffer from high interference levels due to other users of the HF channel which produce artifacts and distortion, hence ... -
Mode Separation And Direction Of Arrival Estimation In Hf Links
(Amer Geophysical Union, 2003)[1] Estimation of arrival angles and incoming signals is a challenging problem for HF channels where the signals are correlated and the separation between the signals can be as low as a couple of degrees. In this paper, a ... -
Regularized Estimation of Vertical Total Electron Content from Global Positioning System Data
(Amer Geophysical Union, 2003)A novel regularization technique which can combine signals from all Global Positioning System (GPS) satellites for a given instant and a given receiver is developed to estimate the vertical total electron content (VTEC) ... -
Regularized Estimation of Vertical Total Electron Content From Gps Data For A Desired Time Period
(Amer Geophysical Union, 2004)In this paper a new algorithm for short-term regularized estimation of vertical total electron content (VTEC) from Global Positioning System (GPS) data is developed. The regularization technique can combine signals, from ... -
Synthetic Tec Mapping with Ordinary and Universal Kriging
(Ieee, 2007)Spatiotemporal variations in the ionosphere affects the BF and satellite communications and navigation systems. Total Electron Content (TEC) is an important parameter since it can be used to analyze the spatial and temporal ... -
Regularized Estimation of Tec from Gps Data for Certain Midlatitude Stations and Comparison with the Iri Model
(Elsevier Sci Ltd, 2007)Regularized estimation of Total Electron Content (Reg-Est) is a novel technique which can combine signals from all the satellites for a given instant and given station and estimate the vertical TEC (VTEC) values for any ... -
Gps/Tec Estimation With Ionolab Method
(Ieee, 2007)Total Electron Content (TEC) is a key variable to measure the ionospheric characteristics and disturbances. The Global Positioning System (GPS) can, be used for TEC estimation making use of the recorded signals at the GPS ... -
Total Electron Content Estimation With Reg-Est
(Amer Geophysical Union, 2007)Total Electron Content ( TEC) constitutes one of the key elements for observing the variable structure of the ionosphere. GPS provides a cost- effective alternative in TEC estimation through earth- based receivers. In this ... -
Sistem Analizi ve Tasarımı
(Hacettepe Üniversitesi, 2007)T.C. Milli Eğitim Bakanlığı ve T.C. Yükseköğretim Kurumu tarafından ortaklaşa hazırlanmış olan ve sınavsız geçiş ile öğrenci alan yüksekokulların teknik programlarında, Sistem Analizi ve Tasarımı 1 ve Sistem Analizi ve ... -
Regional Tec Mapping with Random Field Priors and Kriging
(Amer Geophysical Union, 2008)Total Electron Content ( TEC) is an important parameter in monitoring ionospheric variability. In a given region, TEC can be obtained only by interpolation of measurements due to sparsity of the useful data. The lack of a ... -
Estimation Of Single Station Interfrequency Receiver Bias Using Gps-Tec
(Amer Geophysical Union, 2008)Dual-frequency Global Positioning System (GPS) receivers present a plausible and cost-effective way of computing Total Electron Content (TEC). For accurate estimates of TEC, frequency-dependent satellite and receiver ... -
Scale Factor Mitigating Non-Compliance of Double-Frequency Altimeter Measurements of the Ionospheric Electron Content Over the Oceans With Gps-Tec Maps
(Springeropen, 2009)This paper presents results from a study of GPS total electron content (TEC) grid maps and ionospheric electron content (IEC) over the oceans delivered by the TOPEX/Jason satellites during half a solar cycle (July 2001 to ... -
Tomographic Reconstruction Of The Ionospheric Electron Density As A Function Of Space And Time
(Elsevier Sci Ltd, 2009)Electron density distribution is the major determining parameter of the ionosphere. Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density image by computing Total Electron Content ... -
Multipath Separation-Direction Of Arrival (Ms-Doa) With Genetic Search Algorithm For Hf Channels
(Elsevier Sci Ltd, 2009)Direction-of-Arrival (DOA) defines the estimation of arrival angles of an electromagnetic wave impinging oil a set of sensors. For dispersive and time-varying HF channels, where the propagating wave also suffers from the ... -
Investigation of Hourly and Daily Patterns for Lithosphere-Ionosphere Coupling Before Strong Earthquakes
(Ieee, 2009)The ionosphere can be characterized with its electron density distribution which is a complex function of spatial and temporal variations, geomagnetic, solar and seismic activity. An important measurable quantity about the ...
