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dc.contributor.authorNayir H.en_US
dc.contributor.authorArikan F.en_US
dc.contributor.authorArikan, O.en_US
dc.contributor.authorErol, C.B.en_US
dc.date.accessioned2016-02-08T11:40:12Z
dc.date.available2016-02-08T11:40:12Z
dc.date.issued2007en_US
dc.identifier.urihttp://hdl.handle.net/11693/26944
dc.description.abstractTotal 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 receiver. Reg-Est method that is developed by F.Arikan, C.B. Erol and O. Arikan can be used to estimate high resolution, robust TEC values combining GPS measurements of 30 s resolution obtained from the satellites which are above the 10° elevation limit. Using this method, it is possible to estimate TEC values for a whole day or a desired time period both for quiet and disturbed days of the ionosphere. Reg-Est provides robust TEC estimates for high-latitude, mid-latitude and equatorial stations. In this study, some important parameters of Reg-Est such as ionospheric thin shell height, weighting function and receiver-satellite biases are investigated. By incorporating the results of the investigation, Reg-Est algorithm is developed into IONOLAB method. Thin shell model height is an important parameter for Single Layer Ionosphere Model (SLIM). In this study, it is shown that IONOLAB provides reliable and robust TEC estimates independent of the choice of the maximum ionization height. Signals from the low elevation satellites are prone to multipath effects. In order to reduce the distortion due to multipath signals, the optimum weighting function is implemented in IONOLAB, minimizing the non-ionospheric noise effects. GPS receivers record both pseudorange and phase data of signals. IONOLAB can input absolute TEC computed from the pseudorange measurements or phase-corrected low-noise TEC. The TEC estimates for both of these inputs are in good accordance with each other. Thus, taking either pseoudorange or phase-corrected measurement data as input, high resolution, robust TEC estimates can be obtained from IONOLAB. Another important parameter for TEC estimation is satellite-receiver instrumental biases. The biases are the frequency dependent delays due to satellite and receiver hardware. In order to compute TEC, satellite and receiver biases should be removed from GPS measurements correctly. However, the proper procedure of how to include them in the TEC computation is generally vaguely defined. IONOLAB suggests a technique for inclusion of the hardware biases obtained from the web for TEC estimates that are consistent with the results from the IGS analysis centers. © 2007 IEEE.en_US
dc.language.isoEnglishen_US
dc.source.titleProceedings of the 3rd International Conference on Recent Advances in Space Technologies, RAST 2007en_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/RAST.2007.4283998en_US
dc.subjectAerospace industryen_US
dc.subjectFunction evaluationen_US
dc.subjectGlobal positioning systemen_US
dc.subjectIonosphereen_US
dc.subjectIonospheric measurementen_US
dc.subjectMeasurementsen_US
dc.subjectOptical tomographyen_US
dc.subjectParameter estimationen_US
dc.subjectPhotoacoustic effecten_US
dc.subjectSatellite navigation aidsen_US
dc.subjectSatellitesen_US
dc.subjectShells (structures)en_US
dc.subjectSpace researchen_US
dc.subject(001) parameteren_US
dc.subject(p ,p ,t) measurementsen_US
dc.subjectDistortion (deformation)en_US
dc.subjectElevation satellitesen_US
dc.subjectfrequency dependenten_US
dc.subjectGlobal positioning satellite (GPS) receiversen_US
dc.subjectGPS receiversen_US
dc.subjectHigh resolutionsen_US
dc.subjectIn orderen_US
dc.subjectinternational conferencesen_US
dc.subjectLatitude (CO)en_US
dc.subjectLow noiseen_US
dc.subjectMeasurement dataen_US
dc.subjectMulti-path effectsen_US
dc.subjectMultipath signalsen_US
dc.subjectnoise effectsen_US
dc.subjectPhase dataen_US
dc.subjectPositioning systemsen_US
dc.subjectPseudorange (PR) measurementsen_US
dc.subjectRecorded signalsen_US
dc.subjectsingle layersen_US
dc.subjectSpace technology (ST)en_US
dc.subjectThin-shell modelen_US
dc.subjectTime periodsen_US
dc.subjectTotal electron content (TEC)en_US
dc.subjectWeighting functionsen_US
dc.subjectEstimationen_US
dc.titleGPS/TEC estimation with IONOLAB methoden_US
dc.typeConference Paperen_US
dc.departmentDepartment of Electrical and Electronics Engineering
dc.citation.spage29en_US
dc.citation.epage34en_US
dc.identifier.doi10.1109/RAST.2007.4283998en_US


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