What is “GPS”?
The worldwide positioning system “GPS” (Global Positioning System) was installed by the US military in the year 1978. It consists of 24 satellites orbiting around the earth. It is possible today to know the exact place one is around the world at any point of time or place, dependent upon the development of equipment to report it. The purposeful masking of the satellite signals for civilian use was switched off on May 2, 2000. Since this time it has been possible to calculate locations with an accuracy of 10-30 meters. The latest devices can give locations upto an accuracy of 3 metres.
GPS is a satellite based radio navigation system developed and operated by the U.S. Department of Defense (DOD). GPS permits land, sea, and airborne users to determine their three-dimensional position, velocity, and time 24 hours a day, in all weather, anywhere in the world with a precision and accuracy far better than other radio navigation systems available today or in the foreseeable future. GPS consists of three segments: space, control, and user. The Space Segment, consists of 24 operational satellites in six circular orbits 20,200 km (10,900 nm) above the earth at an inclination angle of 55 degrees with a 12 hour period. The satellites are spaced in orbit so that at any time a minimum of 6 satellites will be in view to users anywhere in the world. The satellites continuously broadcast position and time data to users throughout the world. The Control Segment consists of a master control station in Colorado Springs, with five monitor stations and three ground antennas located throu
GPS is a satellite-based radio navigation system developed and operated by the U.S. Department of Defense (DOD). GPS permits land, sea, and airborne users to determine their three-dimensional position, velocity, and time 24 hours a day, in all weather, anywhere in the world with a precision and accuracy far better than other radio navigation systems available today or in the foreseeable future. GPS consists of three segments: space, control, and user. The Space Segment consists of a minimum of 24 operational satellites in six circular orbits 20,200 km (10,900 NM) above the earth at an inclination angle of 55 degrees with a 12 hour period. The satellites are spaced in orbit so that at any time a minimum of 6 satellites will be in view to users anywhere in the world. The satellites continuously broadcast position and time data to users throughout the world. The Control Segment consists of a master control station in Colorado Springs, with five monitor stations and three ground antennas l
The Global Positioning System (GPS) is a Global Navigation Satellite System (GNSS) developed by the United States Department of Defense. It is the only fully functional GNSS in the world. It uses a constellation of between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave signals. Its official name is NAVSTAR-GPS. GPS permits land, sea, and airborne users to determine their position, velocity and time, 24 hours a day, in all weather, anywhere in the world. The GPS signals are available to an unlimited number of users simultaneously. Each GPS satellite transmits signals to equipment on the ground. GPS receivers passively receive satellite signals; they do not transmit. GPS receivers require an unobstructed view of the sky, so forested areas or locations near tall buildings may reduce performance.
Ans : GPS is a satellite-based radio navigation system, initially developed in the early 1960s and operated by the U.S.Department of Defense (DOD) since then. However, subsequent to a 1966 Presidential Decision Directive which was later passed into law, the “ownership” from DOD was transferred to an Interagency GPS Executive Board (IGEB), co-chaired by senior officials of the Departments of Transportation and Defense to provide management oversight and to assure that GPS meets both civil and military user requirements. The optimum system was viewed as having the following attributes: global coverage, continuous (all weather) operation, ability to serve highly dynamic platforms and high accuracy. GPS consists of three segments – the satellite constellation, ground control network, and user equipment. The satellite constellation comprises satellites in low earth orbit that provide the ranging signals and navigation data messages to the user equipment. The ground control network tracks an
