Satellite+Navigation

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GPS (Global Positioning System) started in 1983.  Accurate positioning, navigating, and timing signal to point out any location in the world.  1988- International Civil Aviation Organization seen the great use of the GPS  -seen it as a use for flights or air navigation systems  Internationally- Russia and other European countries seen the use  GNSS- Global Navigation Satellite Systems  President Reagan used the GPS to the international civil community due to the crash of the Korean Air Lines flight 007  Integrity is used widely of the GNSS-  It defines as the probability that the information provided by a system will not be hazardously misleading. In other words, if the system breaks, would it send a user bad information to cause a dangerous situation.  1992- The FAA (Federal Aviation Administration) created the WAAS (Wide Area Augmentation System) to provide the necessary integrity to utilize the GPS signals for precision approach.  The WAAS contains a network of precisely surveyed wide area reference stations (WRS)  Monitors GPS satellites to determine errors in the GPS satellite signal.  Relays the information about the GPS satellites to the WAAS wide area master stations (WMS)  2 WMS, one located on the East Coast, one on the West Coast. <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> Master station uses the information collected by the reference states to develop corrections to the GPS position information and provides timely notification of unreliable GPS date. Corrections are sent to group uplink stations (GUS) <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> The correction message is transported to a Geostationary Earth Orbit (GEO) satellite. After this, the broadcast to users across the U.S. and Caribbean on the same frequency as GPS. <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> WAAS corrected signal provides 3D guidance to aircraft <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> July 2003, WAAS became the world’s first SBAS system approved for instrument flight. <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;">Local Area Augmentation System (LAAS) is the FAA’s ground based augmentation system. <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> Is a augmentation to GPS that focuses its service on the airport area <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> It broadcasts it correction message via a very high frequency (VHF) radio date link from a ground-based transmitter <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> LAAS will yield the extremely high accuracy, availability, and integrity necessary for Category 1, 2, and 3 precision approaches <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;"> In flight test, LAAS demonstrated accuracy of less than 1 meter in both the horizontal and vertical axis.
 * <span style="font-family: 'Arial','sans-serif'; font-size: 13.3333px; text-decoration: none;">15 Facts: **