THE WHATIS.COM WORD-OF-THE-DAY May 30, 2002 Galileo ______________ TODAY'S SPONSOR: The .tv Corporation
Save 30% on Web addresses! Not only will you get a great deal on your Web addresses, but you'll also get superior customer service, innovative products and services and a place that is easy to register and manage your Web addresses. Great names are still available. Register the names you want before someone else does! Check it out now: http://WhatIs.com/r/0,,3591,00.htm?the.tvcorporation ______________ TODAY'S WORD: Galileo See our definition with hyperlinks at http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci826721,00.html Galileo is the informal name for the European Global Navigation Satellite System (GNSS), a system that will offer users anywhere in the world "near pinpoint" geographic positioning when it becomes fully operational by 2008. Designed to be interoperable with the other two such systems, the United States' Global Positioning System (GPS) and Russia's Global Orbiting Navigation Satellite System (GLONASS), Galileo will enable a user to take a position from any combination of satellites with a single receiver. Both GLONASS and GPS are run by the defense departments of their respective countries. Galileo will be civilian-operated. The Galileo system, which consists of 30 satellites orbiting the earth at a height of 15,000 miles, is expected to pinpoint a geographical position to within a single meter. Because the service's availability will be guaranteed in almost any circumstance, the system will be ideal for applications in which precision and reliability are critical, such as air traffic management (among many possible examples). Galileo will also perform global search and rescue (SAR) functions, based on the Cospas-Sarsat SAR system. Each satellite will have its own transponder, which will transfer distress signals from a user's transmitter to a rescue co-ordination center. Once the rescue operation is launched, the system will transmit a signal to the user, to notify them that help is on the way. When fully deployed, the Galileo system will use 27 operational satellites and three spares for failover redundancy. The satellites will be positioned in three circular Medium Earth Orbit (MEO) planes 15,000 miles up, at an inclination of 56 degrees relative to the equatorial plane. Two Galileo Control Centers (GCC) will be located in Europe; these centers will receive data from a global network of twenty Galileo Sensor Stations (GSS). GSS data will allow the control centers to synchronize the time signals of satellites with the ground station clocks, and to calculate data about system integrity. Five S-Band (2.0-4.0 GHz) and 10 C-Band (4.0-8.0 GHz) uplink stations around the globe will manage the flow of data between the satellites and the control centers. Galileo is named for the Italian astronomer, mathematician, and physicist, Galileo Galilei. In the 16th and 17th centuries, Galileo applied mathematics to the study of physical science. This new approach, coupled with discoveries through the telescope, revolutionized both astronomy and the study of motion. Galileo is also the name of an unmanned American spacecraft sent to explore Jupiter and its moons in the mid-to-late 1990s. RELATED TERMS: Global Navigation Satellite System http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci826721,00.html Global Positioning System http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213986,00.html satellite http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212939,00.html transponder http://whatis.techtarget.com/definition/0,,sid9_gci213219,00.html failover http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci753437,00.html gigahertz http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213983,00.html uplink http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci214061,00.html ______________________ SELECTED LINKS: The European Space Agency answers the question "What is Galileo?" http://www.esa.int/export/esaSA/GGGMX650NDC_navigation_0.html Galileo's World is an online magazine devoted to the project. http://www.galileosworld.com/galileosworld/ The European Union Energy and Transport pages provide more about Galileo and its future applications. http://europa.eu.int/comm/energy_transport/en/gal_en.html Wired News explores the story in "Europe Gives Go-Ahead to Galileo." http://www.wired.com/news/politics/0,1283,51130,00.html ______________________ QUIZ #26 | Storage Smarts Is it a petabyte, terabyte, exabyte, or megabyte? 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