Coco D S, Coker C, Dahlke S R, et al. 1991. Variability of GPS satellite differential group delay biases. IEEE Transactions on Aerospace and Electronic Systems, 27(6): 931-938, doi: 10.1109/7.104264.
[2]
Coster A, Williams J, Weatherwax A, et al. 2013. Accuracy of GPS total electron content: GPS receiver bias temperature dependence. Radio Science, 48(2): 190-196.
[3]
Ma G, Maruyama T. 2003. Derivation of TEC and estimation of instrumental biases from GEONET in Japan. Ann. Geophys., 21(10): 2083-2093, doi: 10.5194/angeo-21-2083-2003.
[4]
Sardón E, Zarraoa N. 1997. Estimation of total electron content using GPS data: How stable are the differential satellite and receiver instrumental biases? Radio Science, 32(5): 1899-1910.
[5]
Vladimer J A, Lee M C, Doherty P H, et al. 1997. Comparisons of TOPEX and Global Positioning System total electron content measurements at equatorial anomaly latitudes. Radio Science, 32(6): 2209-2220, doi: 10.1029/97RS02277.
[6]
Wan W X, Ding F, Ren Z P, et al. 2012. Modeling the global ionospheric total electron content with empirical orthogonal function analysis. Sci. China Tech. Sci., 55(5): 1161-1168, doi: 10.1007/s11431-012-4823-8.
[7]
Xiao R, Xu J S, Ma S Y, et al. 2012. Abnormal distribution of ionospheric electron density during November 2004 super-storm by 3D CT reconstructions from IGS and LEO/GPS observations. Sci. China Tech. Sci., 55(5): 1230-1239, doi: 10.1007/s11431-012-4791-z.
[8]
Zhang D H, Xiao Z. 2000. A method of calculating TEC with GPS data and its application to the ionospheric disturbances. Chinese J. Geophys. (in Chinese), 43(4): 451-458.
[9]
Zhang D H, Zhang W, Li Q, et al. 2010. Accuracy analysis of the GPS instrumental bias estimated from observations in middle and low latitudes. Ann. Geophys., 28: 1571-1580, doi: 10.5194/angeo-28-1571-2010.
[10]
Zhang D H, Mo X H, Ercha A, et al. 2012. Case study of ionospheric fluctuation over mid-latitude region during one large magnetic storm. Sci. China Tech. Sci., 55(5): 1198-1206, doi: 10.1007/s11431-012-4785-x.
[11]
Zhang D H, Shi H, Jin Y Q, et al. 2014. The variation of the estimated GPS instrumental bias and its possible connection with ionospheric variability. Sci. China Tech. Sci., 57: 67-79, doi: 10.1007/s11431-013-5419-7.
[12]
Zhang W, Zhang D H, Xiao Z. 2009. The influence of geomagnetic storms on the estimation of GPS instrumental biases. Ann. Geophys., 27: 1613-1623, doi: 10.5194/angeo-27-1613-2009.
[13]
Birch M J, Hargreaves J K, Bailey G J. 2002. On the use of an effective ionospheric height in electron content measurement by GPS reception. Radio Science, 37(1): 15-1-15-19, doi: 10.1029/2000RS002601.
[14]
Gallagher D L, Craven P D, Comfort R H. 2000. Global core plasma model. J. Geophys. Res., 105(A8): 18819-18833, doi: 10.1029/1999JA000241.
[15]
Hernández-Pajares M J, Juan M, Sanz J, et al. 2009. The IGS VTEC maps: A reliable source of ionospheric information since 1998. J. Geod., 83(3-4): 263-275, doi 10.1007/s00190-008-0266-1.
[16]
Ho C M, Wilson B D, Mannucci A J, et al. 1997. A comparative study of ionospheric total electron content measurements using global ionospheric maps of GPS, TOPEX radar, and the Bent model. Radio Science, 32(4): 1499-1512, doi:10.1029/97RS00580.
[17]
Lanyi G E, Roth T. 1988. A comparison of mapped and measured total ionospheric electron content using global positioning system and beacon satellite observations. Radio Science, 23(4): 483-492, doi: 10.1029/RS023i004p00483.
[18]
Liu J, Liu L B, Zhao B Q, et al. 2012. Empirical modeling of ionospheric F2 layer critical frequency over Wakkanai under geomagnetic quiet and disturbed conditions. Sci. China Tech. Sci., 55(5): 1169-1177, doi: 10.1007/s11431-012-4801-1.
[19]
Liu Z Z, Gao Y. 2004. Ionospheric TEC predictions over a local area GPS reference network. GPS Solutions, 8(1): 23-29, doi: 10.1007/s10291-004-0082-x.
[20]
Niranjan K, Srivani B, Gopikrishna S, et al. 2007. Spatial distribution of ionization in the equatorial and low-latitude ionosphere of the Indian sector and its effect on the pierce point altitude for GPS applications during low solar activity periods. J. Geophys. Res., 112(A5), A05304, doi: 10.1029/2006JA011989.
[21]
Otsuka Y, Ogawa T, Saito A, et al. 2001. A new technique for mapping of total electron content using GPS network in Japan. Earth, Planets and Space, 54(1): 63-70.
[22]
Rama Rao P V S, Niranjan K, Prasad D S V V D, et al. 2006. On the validity of the ionospheric pierce point (IPP) altitude of 350 km in the Indian equatorial and low-latitude sector. Ann. Geophys., 24: 2159-2168, doi: 10.5194/angeo-24-2159-2006.
