Beginning of Essay
The GPS consists of three main segments: space, control, and user. Satellites, which are launched into specific orbits and monitored by ground station, transmit information in form of radio signals. Ground stations update the information from satellites and send ....

Middle of Essay
.... Random Code is a complicated sequence of pulse signals. This code ensures not only that the same frequency can be used for all satellites, but also that GPS receivers can receive the GPS signals without the need of big satellite dishes. Moreover, Pseudo Random Code also identifies which satellite is sending. When a receiver receives a Pseudo Random Code, the number of the satellite shows up on a screen. The ephemeris data reflects status of satellites, current date and time. The position of a satellite is encoded in almanac data. A receiver decodes almanac data of a satellite and finds out where that satellite is at any time. Control Segme ....