Browsing by Author "Arikan, F."
Now showing items 1-20 of 27
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Adaptive tracking of narrowband HF channel response
(Wiley-Blackwell Publishing, 2003)Estimation of channel impulse response constitutes a first step in computation of scattering function, channel equalization, elimination of multipath, and optimum detection and identification of transmitted signals through ... -
Algorithm for high quality ionograms
(IEEE, 2000)A new ionogram algorithm, which is highly successful in generating robust and sharp digital ionograms free of artefacts and processing noise, is presented. An important feature of the algorithm is the distortionless zooming ... -
Association of ionospheric storms and substorms of global electron content with proxy AE index
(Pergamon Press, 2015)Storm time modeling of Global Electron Content (GEC) calculated from GIM-TEC for 1999-2013 is associated with new proxy of Auroral Electrojet variability expressed as a smoothed and normalized Auroral Electrojet index ... -
Dynamo equation solution using Finite Volume Method for midlatitude ionosphere
(KeAi Communications Co., 2018)Ionosphere is the layer of atmosphere which plays an important role both in space based navigation, positioning and communication systems and HF signals. The structure of the electron density is a function of spatio-temporal ... -
Estimation of hmF2 and foF2 communication parameters of ionosphere F2-layer üsing GPS data and IRI-plas model
(IEEE, 2013-10)F2-layer is the most important and characteristic layer of the ionosphere in the propagation of high frequency (HF) waves due to the highest level of conductivity in the propagation path. In this study, the relation of ... -
Estimation of single station interfrequency receiver bias using GPS-TEC
(Wiley-Blackwell Publishing, Inc., 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 ... -
Investigation of ionospheric trend over Turkey using sliding window statistical analysis method
(IEEE, 2013)In this paper, variability of trend over Turkey is investigated statistically by Sliding Window Statistical Analysis (SWSA) method. First and second moment of the variability of ionospheric trend is calculated by SWSA ... -
Investigation of total electron content variability due to seismic and geomagnetic disturbances in the ionosphere
(Wiley-Blackwell Publishing, 2010-10-20)Variations in solar, geomagnetic, and seismic activity can cause deviations in the ionospheric plasma that can be detected as disturbances in both natural and man-made signals. Total electron content (TEC) is an efficient ... -
Ionogram scaling using Hidden Markov Models
(Institute of Electrical and Electronics Engineers, 2018)In this paper, a novel method for electron density reconstruction using ionosonde data is proposed. Proposed technique uses Hidden Markov Models for extracting echoes that provides valuable information about electron density ... -
Mode separation and direction of arrival estimation in HF links
(Wiley-Blackwell Publishing, 2003)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 new ... -
Model based computerized ionospheric tomography in space and time
(Elsevier, 2018)Reconstruction of the ionospheric electron density distribution in space and time not only provide basis for better understanding the physical nature of the ionosphere, but also provide improvements in various applications ... -
Multipath separation-direction of arrival (MS-DOA) with genetic search algorithm for HF channels
(ELSEVIER, 2009)Direction-of-Arrival (DOA) defines the estimation of arrival angles of an electromagnetic wave impinging on a set of sensors. For dispersive and time-varying HF channels, where the propagating wave also suffers from the ... -
A new technique for direction of arrival estimation for ionospheric multipath channels
(ELSEVIER, 2009)A novel array signal processing technique is proposed to estimate HF channel parameters including number of paths, their respective direction of arrivals (DOA), delays, Doppler shifts and amplitudes. The proposed technique ... -
NVIS HF signal propagation in ionosphere using calculus of variations
(KeAi Communications Co., 2018)Modeling Near Vertical Incidence Sounding (NVIS) High Frequency (HF) signal propagation in the ionosphere is important. Because, ionosondes which are special types of radars probing the ionosphere with certain HF frequencies ... -
Observed Ionospheric Effects of 23 October 2011 Van, Turkey Earthquake
(Taylor and Francis, 2012-01-17)On 23 October 2011, a very strong earthquake with a magnitude of Mw = 7.2 shook Eastern Anatolia, and tremors were felt up to 500 km from the epicentre. In this study, we present an early analysis of ionospheric disturbance ... -
Online user‐friendly slant total electron content computation from IRI‐Plas: IRI‐Plas‐STEC
(Wiley-Blackwell Publishing, Inc., 2014-01)Slant total electron content (STEC), the total number of free electrons on a ray path, is an important space weather observable. STEC is the main input for computerized ionospheric tomography (CIT). STEC can be estimated ... -
Online, automatic, near-real time estimation of GPS-TEC: IONOLAB-TEC
(IEEE, 2013)The variability of space weather can best be captured using total electron content (TEC), which corresponds to total number of electrons on a ray path. The dual-frequency ground based GPS receivers provide a cost-effective ... -
Performance evaluation of the sequential track initiation schemes with 3D position and doppler velocity measurements
(Electromagnetics Academy, 2009)This study investigates the effect of incorporating Doppler velocity measurements into the most commonly used sequential track initiation schemes, the rule and logic based schemes. The measurement set has been expanded ... -
Performance evaluation of track association and maintenance for a MFPAR with doppler velocity measurements
(2010)This study investigates the effects of incorporating Doppler velocity measurements directly into track association and maintenance parts for single and multiple target tracking unit in a multi function phased array radar ... -
Performance of GPS slant total electron content and IRI-Plas-STEC for days with ionospheric disturbance
(KeAi Communications Co., 2016)Total Electron Content (TEC) is an important observable parameter of the ionosphere which forms the main source of error for space based navigation and positioning systems. Since the deployment of Global Navigation Satellite ...
