Browsing by Author "Arıkan, F."
Now showing items 1-20 of 26
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3D electron density estimation in the ionosphere
(IEEE, 2014)Ionosphere has ion distribution which is variable in space and time. There have been physical and empirical studies for modeling the ionosphere. International Reference Ionosphere extended to Plasmasphere (IRI-Plas) is the ... -
Algorithms and basis functions in tomographic reconstruction of ionospheric electron density
(IEEE, 2005)Computerized ionospheric tomography (CIT) is a method to investigate ionosphere electron density in two or three dimensions. This method provides a flexible tool for studying ionosphere. Earth based receivers record signals ... -
Application of modified particle swarm optimization method for parameter extraction of 2-D TEC mapping
(EGU, 2012-04)Ionosphere is a very important part of Space Weather. Modeling and monitoring of ionospheric variability is a major part of satellite communication, navigation and positioning systems. Total Electron Content (TEC), which ... -
Bilgisayarlı iyonosfer tomografisinde açılım işlevlerinin ve yeniden yapılandırma algoritmalarının model üzerinden karşılaştırılması
(IEEE, 2005-05)Bilgisayarlı İyonosfer Tomografisi (BİT), iyonosfer elektron yoğunluğunun iki boyutlu veya üç boyutlu olarak görüntülenmesi için kullanılan bir yöntemdir. Bu yöntem özellikle iyonosfer fiziği veya uydu haberleşmesi gibi ... -
Classification of regional ionospheric disturbance based on machine learning techniques
(European Space Agency, 2016)In this study, Total Electron Content (TEC) estimated from GPS receivers is used to model the regional and local variability that differs from global activity along with solar and geomagnetic indices. For the automated ... -
Determining F2 layer parameters via optimization using IRI model and IONOLAB TEC estimations
(IEEE, 2011)We know that F2 layer of the ionosphere is most important layer in the progaration of high frequency (HF) waves. In this study, The relation of the height (HmF2) and the critical frequency (FoF2) of F2 layer-among the ... -
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 ... -
Incorporating doppler velocity measurement for track initiation and maintenance
(IET, 2006)Performance of multiple target tracking algorithms in complex environments heavily relies on the success of track initiation and measurement-to-track association algorithms. Doppler velocity measurement is the major ... -
Investigation of ionospheric precursors of 23 October 2011 Mw=7.2 earthquake in Van, Turkey
(EGU, 2012-04)In recent years, a strong coupling between ionospheric disturbances and seismic activity has been observed through the increase of ion temperatures, critical frequencies of ionospheric layers and Total Electron Content ... -
Investigation of litosphere-ionosphere coupling using total electron content
(IEEE, 2009)In this study, the relation between Total Electron Content (TEC) estimates obtained from GPS and the earthquakes is examined. Five earthquakes between 2003-2008 occured in Japan with different properties and China earthquake ... -
Investigation of short-period ionospheric variation over Turkey
(IEEE, 2014)In this paper, characteristic of short-period ionospheric variability over Turkey is determined statistically by a novel metric. First and second moment of the variability of ionospheric variations is calculated by Sliding ... -
Ionolab grubunun iyonküre uzaktan algılama ve 2-b görüntüleme çalışmaları
(IEEE, 2014-04)Bu çalışmada, IONOLAB grubunun son 10 yıldır iyonküre uzaktan algılaması ve 2-B görüntüleme çalışmaları özetlenecektir. TÜBİTAK EEEAG 105E171 ve 109E055 projelerinde, çift frekanslı Yerküresel Konumlama Sistemi (YKS) ... -
Ionospheric total electron content estimation using IONOLAB method
(IEEE, 2007)Ionosphere which is an important atmospheric layer for HF and satellite communications, can be investigated through Total Electron Content (TEC). Global Positioning System provides cost-effective means for TEC estimation. ... -
İyonküre elektron içeriği kullanılarak deprem öncül tespit sinyali oluşturulması
(IEEE, 2014-04)Sismik olayların iyonküredeki elektron dağılımını etkilediği ve bu etkinin bir kaynağının sismik hareketlilik öncesi kayaçların sıkışması sonucu kayaç yüzeylerinde oluşan elektrik alanın yol açtığı iyonlaşma olduğu yakın ... -
İyonosfer TEİ verilerinin uzay-zamansal aradeğerlemesi
(IEEE, 2011-04)GPS sinyalleri iyonosferdeki elektron yoğunluğunun kestirilmesi için önemli bir bilgi kaynağıdır. Ancak, GPS alıcılarında sinyallerin kaydedilemediği durumlar olmaktadır. Bu kesinti sırasında iyonosfer elektron içeriğinin ... -
A machine learning‐based detection of earthquake precursors using ionospheric data
(Blackwell Publishing, 2020)Detection of precursors of strong earthquakes is a challenging research area. Recently, it has been shown that strong earthquakes affect electron distribution in the regional ionosphere with indirectly observable changes ... -
A method for automatic scaling of ionograms and electron density reconstruction
(IEEE, 2021-10-19)Ionogram scaling is the process of reconstructing electron density with respect to height by using the measurements of a remote sensing instrument known as ionosonde. In this study, a novel two stage ionogram scaling ... -
A new algorithm for high-quality ionogram generation and analysis
(Wiley-Blackwell Publishing, Inc., 2002)Standard digital ionograms that are generated by fast Fourier transform or autoregressivemodeling suffer from high interference levels due to other users of the HF channel whichproduce artifacts and distortion, hence ... -
Performance improvement of track initiation algorithms with the incorporation of doppler velocity measurement
(IEEE, 2006)In this study, to obtain the analytical expressions of false track initiation probability, elevation and Doppler velocity measurements extracted by a phased array radar are incorporated for the first time into the commonly ... -
Reconstruction of 3-D ionospheric electron density distribution by using GPS measurements and IRI-Plas model
(Asia Oceania Geosciences Society, 2012-08)
