They show that NeQuick 2 model underestimates the ionosphere topside and plasmashere electron content, particularly during the early morning hours. The conditions under which the discrepancy between the model and experimental data is the highest have been also identified and considered as indications for...
结果表明,当卫星轨道低于500 km时,相比于传统的改进Klobuchar改正的定轨精度,利用NeQuick2改正的定轨精度提高0.2 m左右,与双频伪距法定轨精度相当。 Abstract In this paper, a three-dimensional ionosphere model-NeQuick2 is introduced. We firstly evaluate the precision of Klobuchar and NeQuick2 using global ...
PerformanceevaluationofNeQuick2ionospheremodel LIShi‐jia 1 ,CAIChang‐sheng 1,2 ,DAIWu‐jiao 1,2 ,YIZhi‐peng 3 (1.SchoolofGeoscienceandInfo‐PhysicsofCentralSouthUniversity,Changsha410083,China;2.KeyLabofPrecise Surveying&DeformationDisasterMonitoringinHunanProvince,Changsha410083,China;3.ElectricPowerMark...
NeQuick2 model did not respond to the effects associated with geomagnetic storm. There is need to include storm related parameters in the prediction of vTEC using NeQuick2 model. Introduction The ionosphere is a region of the earth’s atmosphere in the altitude between 60 and 1000 km (Langley,...
This paper presents an analysis of the capability of NeQuick 2 model to reproduce the slant TEC values measured at stations worldwide distributed. The data used cover complete years of high (2000) and moderate solar activity (2004). A comparison with GPS Ionospheric Correction Algorithm (ICA), ...
Hence, the performance of those empirical ionosphere models needs careful validation due to very few observational data contributed from South-East Asia for model development. The performances of the IRI and NeQuick models in predicting the characteristics of the ionosphere using GPS have been ...
NeQuick-G is the emerging model developed for Galileo, it over-performs Klobuchar model, in the both measurement and position domains. These improvements are compensated by a higher computational load which is fundamental, for mass market devices. The main goal of this work is to identify a ...
This study investigates the performances of NeQuick 2 in the East African region by assisting the model with measurements from a single Global Positioning System (GPS) receiver, which has been deployed recently. This can be done by first calculating an effective ionization level that drives NeQuick...
However, the comparison study confirms the NeQuick-2 model overestimating the GNSS-VTEC irrespective of time of observation during the day. Monthly behavior of VTEC variation reflects that the NeQuick model is well estimated with GNSS-VTEC during November 2016 and January, February and October months...
The monthly and seasonal behavior of vTEC obtained from each calibration technique is compared with the vTEC obtained from the NeQ-2 model during a quiet period. It is observed that the vTEC value obtained from all studied approaches started to increase from 00:00 Universal Time (UT = Local ...