GLOBAL POSITIONING SYSTEM

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Information about GLOBAL POSITIONING SYSTEM
Science-Technology

Published on June 16, 2008

Author: sarathbabu.mg

Source: authorstream.com

Global Positioning System : Global Positioning System By Sarath Babu Global Positioning Systems : Global Positioning Systems GPS is a revolutionary navigation system 24 satellites orbiting the earth Provide location within metres or less anywhere on the globe. Now available in many cars as an option Created and operated by the US Department of Defense More about GPS satellites : More about GPS satellites Constellation of 27 satellites (24 active + 3 spare) Orbit 12,600 miles above earth (10,900 nautical miles) Satellites in 12 hour orbit First satellite launched in 1978, 24th became operational in 1994 Selective availability was removed in May, 2000 Handheld receivers are now much more accurate Global Positioning Systems : Global Positioning Systems GPS is a revolutionary navigation system 24 satellites orbiting the earth Provide location within metres or less anywhere on the globe. Now available in many cars as an option Created and operated by the US Department of Defense How does GPS work? : How does GPS work? Measuring distance by measuring time Satellites send coded signals indicating their position in space and the exact time the signals are being sent Receivers use the time it takes signal to travel from satellite to receiver to determine distance from satellite to receiver Information from multiple satellites is used to determine position through ‘triangulation’ How does GPS work? : How does GPS work? How does GPS work? : How does GPS work? More about GPS receivers : More about GPS receivers A GPS receiver's job is to locate four or more satellites, figure out the distance to each, and use this information to deduce its own location. Hand-held receivers for recreational use with accuracy of 10-15 metres Vehicle mounted receivers for navigation or agricultural use with accuracy of < 1 metre Backpack or tripod mounted receivers for surveying use with accuracy of 5 – 10 centimetres More about GPS receivers : More about GPS receivers Receivers require clear line-of-sight; thus, they will not work indoors or where tall objects obscure the sky What’s so cool about GPS? : What’s so cool about GPS? GPS units Can be used as a digital compass Can be used to determine ground speed Can store landmarks (locations) Can be used for dynamic routing Can be used for mapping applications Applications of GPS : Applications of GPS In-vehicle Navigation (car, boat, airplane) Asset Management Construction Geologic Research & Mining Military Navigation and Operations Mapping & Surveying Precision Agriculture Public Health Public Safety Wireless Communications Integrating GIS and GPS : Integrating GIS and GPS Collect a series of latitude and longitude points using GPS receivers add them into an existing digital map Skills in data collection/creation GPS reading observation Digital photos Collecting data : Collecting data Collect data in the field using GPS Write down point coordinates and additional data observations - OR - Use tracking function of your unit to store points, lines, or polygons, and write down additional observations Using the data you collect : Using the data you collect Manually enter the coordinates and observations into a table (Excel, etc.) Save as a .dbf file Use “Add X,Y” or “Add Event Theme” to create points on your map - OR - Use your GPS unit cable to download the data from the unit to your computer World Scenario : World Scenario Developed by the United States Department of Defense, GPS is officially named NAVSTAR GPS Other satellite navigation systems in use or various states of development include: Beidou – China's regional system that China has proposed to expand into a global system named COMPASS. Galileo – a proposed global system being developed by the European Union, joined by China, Israel, India, Morocco, Saudi Arabia, South Korea, and Ukraine, planned to be operational by 2011–12. GLONASS – Russia's global system which is being restored to full availability in partnership with India. Indian Regional Navigational Satellite System (IRNSS) – India's proposed regional system. QZSS – Japanese proposed regional system, adding better coverage to the Japanese Islands. Indian Regional Navigational Satellite System : Indian Regional Navigational Satellite System The Indian Regional Navigational Satellite System (IRNSS) is an autonomous regional satellite navigation system being developed by Indian Space Research Organisation which would be under total control of Indian government. Development The government approved the project in May 2006, with the intention it be implemented within six to seven years. The first satellite of the proposed constellation, developed at a cost of Rupee 1,600 crore (16 billion rupees), is expected to be launched in 2009. For more information… : For more information… Garmin website http://www.garmin.com/ Trimble GPS www.trimble.com/gps Wikipedia - http://en.wikipedia.org/wiki/Gps How stuff works www.howstuffworks.com Queries ……………. : Queries ……………. ThAnk yOU : ThAnk yOU

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