A New Ionosphere Monitoring Technology Based on GPS

Although global positioning system (GPS) was originally planned as a satellite-based radio-navigation system for military purposes, civilian users have significantly increased their access to the system for both, commercial and scientific applications. Almost 400 permanent GPS tracking stations have been stablished around the globe with the main purpose of supporting scientific research. In addition, several GPS receivers on board of low Earth orbit satellites fitted with special antennas that focus on Earth's horizon, are tracking the radio signals broadcasted by the high-orbiting GPS satellites, as they rise and set on Earth horizon. The data of these ground and space-born GPS receivers, readily accessible through Internet in a ‘virtual observatory’ managed by the International GPS Service, are extensively used for many researches and might possibly ignite a revolution in Earth remote sensing.By measuring the changes in the time it takes for the GPS signals to arrive at the receiver as they travel through Earth's atmosphere, scientists can derive a surprising amount of information about the Earth's ionosphere, a turbulent shroud of charged particles that, when stimulated by solar flares, can disrupt communications around the world. This contribution presents a methodology to obtain high temporal resolution images of the ionospheric electron content that lead to two-dimensional vertical total electron content maps and three-dimensional electron density distribution. Some exemplifying results are shown at the end of the paper.

[1]  Markus Rothacher,et al.  Daily Global Ionosphere Maps Based on GPS Carrier Phase Data Routinely Produced by the CODE Analysis Center , 1996 .

[2]  Ionospheric effects of the solar flares of September 23, 1998 and July 29, 1999 as deduced from global GPS network data , 2000, physics/0007036.

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

[4]  Jules Aarons,et al.  GPS phase fluctuations in the equatorial region during sunspot minimum , 1997 .

[5]  Jaume Sanz,et al.  New approaches in global ionospheric determination using ground GPS data , 1999 .

[6]  A. J. Van Dierendonck,et al.  Ionospheric Scintillation Monitoring Using Commercial Single Frequency C/A Code Receivers , 1993 .

[7]  Claudio Brunini,et al.  Comparing vertical total electron content from GPS, Bent and IRI models with TOPEX-Poseidon , 2002 .

[8]  T. Gaussiran,et al.  Passive detection of sporadic E using GPS phase measurements , 1995 .

[9]  C. Brunini,et al.  Systematic behavior of semiempirical global ionospheric models in quiet geomagnetic conditions , 2002 .

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

[11]  K. Davies,et al.  Studying the ionosphere with the Global Positioning System , 1997 .

[12]  Alfred Kleusberg,et al.  Global behaviour of the ionosphere electron density using GPS observations , 2002 .

[13]  Xiaoqing Pi,et al.  Global ionosphere perturbations monitored by the Worldwide GPS Network , 1996 .

[14]  Anthony J. Mannucci,et al.  A global mapping technique for GPS‐derived ionospheric total electron content measurements , 1998 .

[15]  Gabor E. Lanyi,et al.  A comparison of mapped and measured total ionospheric electron content using global positioning system and beacon satellite observations , 1988 .

[16]  Anthony J. Mannucci,et al.  Subdaily northern hemisphere ionospheric maps using an extensive network of GPS receivers , 1995 .

[17]  R. Hunsucker,et al.  Detection of auroral activity using GPS satellites , 1995 .

[18]  D. Klähn,et al.  About the Use of GPS Measurements for Ionospheric Studies , 1996 .

[19]  W.A. Feess,et al.  Evaluation of GPS Ionospheric Time-Delay Model , 1987, IEEE Transactions on Aerospace and Electronic Systems.

[20]  John Keith Hargreaves,et al.  The solar–terrestrial environment: Preface , 1992 .

[21]  Xiaoqing Pi,et al.  Ionospheric total electron content perturbations monitored by the GPS global network during two northern hemisphere winter storms , 1998 .

[22]  John A. Klobuchar,et al.  Ionospheric scintillation monitoring using GPS , 1982 .

[23]  Rodney B. Bent,et al.  Documentation and Description of the Bent Ionospheric Model , 1973 .

[24]  George L. Siscoe,et al.  The Solar–Terrestrial Environment , 1995 .