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GPS satellites roam high above in very precise orbits of around 16,000 km up (to use the space shuttle as an example, orbits at about 320km and geosynchronous satellites orbit at about 38,600km). Because the satellites are so far away, their radio signals are fairly weak. GPS satellites play an important role in many navigation systems produced today, and is beginning to play an increasing role in providing accurate time signals for many industries. Applications Include: Land surveying, autonomous vehicle control including the smart highway system, marine navigation, air traffic control, satellite navigation, and power signal time synchronization. GPSnet) system under various ionospheric conditions, this paper investigates both temporal and spatial variations of the ionospheric total electrons content (TEC) through analysing GPS dual frequency data from the GPSnet or similar network over a period of two years. Diurnal and seasonal ionospheric variations, and winter anomaly of the ionosphere in Victoria are investigated based on GPS-derived TEC values. GPS satellites precise orbits are derived using 24 hour data segments from the global GPS network. An informational summary file is provided to document the computation and to convey relevant information about the observed satellites, such as maneuvers or maintenance. GPS navigational systems have tremendous benefits over other positioning systems in that these systems do not rely upon visual, magnetic, or other points of reference. However, conventional GPS navigational systems can experience blackout areas or regions when line-of-site is broken with the satellites. GPS is regarded by most governments as a utility on a par with mobile telephony. When mobile telephones first started appearing in the early 1980s, they were regarded as a luxury item. Nowadays they are considered commonplace and necessary items for everyone. Similarly GPS systems will experience the same rise in acceptance from people and governing parties. The benefits of this type of technology is difficult to realize until ownership and constant use has provided the user with experiencial viewpoints. GPS technologies are often used and are working in many areas that we do not normally consider. GPS satellites fly in circular orbits at an altitude of 20,100 km (12,500 mi) and with a period of 12 hours. The orbits are tilted to Earth's equator by 55 degrees to ensure coverage of polar regions. The inside goss on GPS systems and ancillary supporting technology such as GPS Satellites can be found here.
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gps, gps systems, gps satellites, global positioning system,
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