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Answer Posted / vijay.k
1. INTRODUCTION
Throughout time people have developed a variety of ways to figure out their
position on earth and to navigate from one place to another. Early mariners
relied on angular measurements to celestial bodies like sun and stars to
calculate their location. The 1920s witnessed the introduction of more
advanced technique-radio navigation-based at first on radios that allowed
navigators to locate the direction of shore-based transmitters when in
range. Later development of artificial satellites made possible the
transmission of more precise, line of sight radio navigation signals and
sparked a new era in navigation technology. Satellites are first used in
position finding in a simple but reliable 2D Navy system called Transit.
This laid the groundwork for a system that would later revolutionize
navigation for ever-the Global Positioning System
The Global Positioning System (GPS) is a satellite based navigation system.
The concept of GPS was introduced by the United States Department of
Defense (DoD). It is in the year 1994 that the GPS was completely
developed. The GPS is developed to provide continuous, highly precise
positions, velocity and time information to the land, sea, air and space
based users. The intent of system is to use a combination of ground
stations, orbiting satellites and special receivers to provide navigation
capabilities to virtually everyone, at any time, anywhere in the world,
regardless of weather conditions.
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