Effects of ionospheric disturbances on GPS observation in low latitude area

In this paper, ionospheric disturbance data from a local GPS network in Hong Kong (low latitude region) are studied in the solar maximum period (2001–2003). The spatial and temporal distributions of the disturbances in Hong Kong are investigated. It is found that strong ionospheric disturbances occur frequently during the solar maximum period, particularly around March and September, and concentrate at the region around geographic latitude 22°N (geomagnetic latitude 12°N). The effects of the disturbances on GPS geodetic receivers, such as loss of lock and measurement noise level, are also analyzed for the 3-year period. It shows that the measurement noise level and the number of losses of lock in GPS data increase dramatically during ionospheric disturbance periods. The behaviors of different types of GPS receivers during the disturbances are also compared.

[1]  Marcio Aquino,et al.  Implications of Ionospheric Scintillation for GNSS Users in Northern Europe , 2005, Journal of Navigation.

[2]  Taehwan Kim,et al.  Scintillation modeling for GPS‐Wide Area Augmentation System receivers , 2001 .

[3]  C. Hegarty,et al.  Modeling the effects of ionospheric scintillation on GPS/Satellite‐Based Augmentation System availability , 2003 .

[4]  S. Skone,et al.  The impact of magnetic storms on GPS receiver performance , 2001 .

[5]  Keith M. Groves,et al.  A Comparison of GPS Performance in a Scintillation Environment at Ascension Island , 2000 .

[6]  Anthea J. Coster,et al.  Real‐Time Ionospheric Monitoring System Using GPS , 1991 .

[7]  Per Enge,et al.  Ionosphere Threat to LAAS: Updated Model, User Impact, and Mitigations , 2004 .

[8]  Xiaoqing Pi,et al.  Monitoring of global ionospheric irregularities using the Worldwide GPS Network , 1997 .

[9]  Zuo Xiao,et al.  Study of the ionospheric total electron content response to the great flare on 15 April 2001 using the International GPS Service network for the whole sunlit hemisphere , 2003 .

[10]  Xiaoli Ding,et al.  Critical issues on GPS RTK operation using Hong Kong GPS active network , 2002 .

[11]  John A. Klobuchar,et al.  Ionospheric Scintillation Effects in the Equatorial and Auroral Regions , 2000 .

[12]  Alfred Kleusberg.  Atmospheric Models from GPS , 1998 .

[13]  X. Ding,et al.  Rapid static and kinematic positioning with Hong Kong GPS active network , 2001 .

[14]  John K. Walker,et al.  Spherical cap harmonic modelling of high latitude magnetic activity and equivalent sources with sparse observations , 1989 .

[15]  A. J. V. Dierendonck.  Eye on the Ionosphere: Measuring Ionospheric Scintillation Effects from GPS Signals , 1999 .