ASSESSMENTS OF NTCM MODEL AGAINST GPS RECEIVER MEASUREMENTS IN ETHIOPIAN SECTOR

Kenaw, Abay

dc.contributor.author	Kenaw, Abay
dc.date.accessioned	2017-12-19T03:02:43Z
dc.date.available	2017-12-19T03:02:43Z
dc.date.issued	2017-12-19
dc.identifier.uri	http://hdl.handle.net/123456789/8273
dc.description.abstract	The ionosphere causes delay of radio signals, and if not mitigated, it can be the largest source of error in GNSS positioning and navigation. The ionospheric models can be used to estimate these ionospheric errors and also used for satellite and receiver inter-frequency bias estimation and Total Electron Content (TEC) calibrations. Nowadays there are several empirical ionospheric TEC models. We evaluated accuracy of a relatively new model developed at DLR (Deutsches Zentrum f ¨ur Luft-und Raumfahrt), the Neustrelitz TEC Model (NTCM), by using the GPS receiver vTEC data as a reference data for the year 2012 in asosa (10.05 0 N latitude and 34.5644 E longitude), Ethiopian sector. For this study the mean vertical TEC data was used as a reference data for the NTCM model validation. Then the GPS receiver TEC values and the modeled TEC values were then compared by the help of MATLAB software after plotting the two values. From daily, monthly and seasonal plots of the modeled and observed TEC values the mean errors, root mean square errors and standard deviation errors and correlation coeﬃcients were used as statistical analysis of the two values. By doing so We found that the model able to reproduce vTEC values with a mean modeling error of 8.8TECU and STD error of 3.8 TECU. In addition to this in all days, seasons and months of the year the model overestimates the observed vTEC value and have low mean errors at about 15UT hours.	en_US
dc.language.iso	en_US	en_US
dc.subject	physics	en_US
dc.title	ASSESSMENTS OF NTCM MODEL AGAINST GPS RECEIVER MEASUREMENTS IN ETHIOPIAN SECTOR	en_US
dc.type	Thesis	en_US