GPS Tracker

Recently, a prisoner in Jammu and Kashmir was released on bail after he was tagged with a Global Positioning System (GPS) tracking device to monitor his movements.

GPS trackers are a precondition for bail in several countries including the United States, the United Kingdom, and Malaysia. It is the 1^st time this technology has been used in India for this purpose.

GPS Tracker – It is a small, portable unit that allows users to monitor and track its location.
It connects to a series of satellites to determine location and consists of 3 segments.

The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radio navigation system owned by USA.

Global Navigation Satellite System (GNSS) refers to a constellation of satellites providing signals from space that transmit positioning and timing data to GNSS receivers. It typically includes GPS, GLONASS, Baidu, Galileo, and any other constellation system.

Space Segment – GPS consists of 27 satellites that orbit the Earth (24 are operational, and 3 are backup satellites) and orbit the earth every 12 hours.
User Segment – It has GPS receivers to receive the signals sent by GPS satellites and use them to determine the user's position in space and time.
Control segment - Different tracking stations are located around the globe which pick up microwave carrier signals transmitted by the satellites.

In geometry, trilateration is defined as the process of determining absolute or relative locations of points by measurement of distances, using the geometry of circles, spheres or triangles.

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