Global Navigation Satellite System Essay Example | Topics and Well Written Essays - 750 words

Global Navigation artificial satellite System - Essay ExampleThe present working GNS system is the Global Positioning System (GPS) developed by USA. The use of GPS is principally for military purposes and agreeled by the military. Europe is going to launch its own GNSS under the call down of Galileo. Galileo is Europes first GNSS which is intended to be used by various civil sectors such as transport, companionable service, judicial system, public works, rescue teams, etc. Galileo is set to be full operational by 2008.The fully deployed system consists of 30 satellites (27 operational + 3 active spares), lineed in tether circular Medium acres sector (MEO) planes in 23616 km altitude above the earth, and at an inclination of the orbital planes of 56 degrees with name to the equatorial plane (ESA, 2005). As a large number of satellites are working together with three active spares, therefore the dysfunction of one of the satellites does not have much effect on the boilersuit functioning of the system.Each satellite of a GNSS is submitd with an atomic clock which measures clipping very accurately. The satellites continuously dismiss signals simultaneously indicating the time of leaving of the signals from the satellite. A receiver on the surface of the earth has the exact flesh out of the orbits of all the satellites in its memory. By reading the incoming signal it can thus recognise the bad-tempered satellite, determine the time taken by the signal to arrive and calculate the distance from the satellite (EUROPA, 2006). The solid ground receiver receives the signals from about four contrasting satellites simultaneously. Once it does so it can calculate the exact position of itself. The control of the satellites and performance of navigation management is carried out by Ground Control Centres (GCC) located at different places on the earth. The control centres contact with the satellites through Up-link stations and carry out the operations such as time synchronisation.Development The first experimental satellite, part of the so called Galileo System Test Bed (GSTB) will be launched in the s semester of 2005 (ESA, 2005). This satellite is intended to test the technologies still under increase. Then in the second stage about four operational satellites are scheduled to be launched in 2006 for In Orbit Validation (IOV). After this the remaining satellites will be launched to make it fully operational in 2008.UsesGNSS has to provide four basic services as follows.Position, Velocity and Time Service (PVT)Accuracy and Integrating go (AI)Ranging and Timing Services (RT)High Integrity Services (HI)PoliticsThere is an opposition to the European Galileo GNSS mainly from GPS who want to be the sole satellite navigation system. The US is continuously making some announcements regarding GPS in order to derail Galileo. These sorts of announcements, however, do not have any effective impact on the development of Galileo. The objections f rom US side are that Galileo will be purely used for civil navigation without the control of military over it. Instead of this opposition from the US, development of Galileo will surely go ahead. This is a galactic step forward because it is for the benefit and welfare of the common people. It will directly benefit various sectors of the familiarity and indirectly almost whole