Best space (Space segment) consists of 24 satellites, the world khotronop the Sun used to perform the backup 3 21 Sun Moon floating in orbit about 20, 000 km. Rotate around the world 1 Orbit cycle takes 12 hours to orbit with all six orbit a satellite for each orbit with the Sun to the precision 4 is correct. To calculate the coordinates of GPS Receiver position at the satellite receiver on the atomic clock of the world to use caesium atomic clocks, including Mick and atomic clock rubidiam 2 2 households. Control station (Control segment): ground station that controls the system. Distributed according to the different parts of the world. To update the data, satellite, is accurate and up-to-date at all times. By divided into 1. the primary control station. 2. satellite tracking station serves the piece of land satellite tracking at any time. 3. pick up a signal station. In the main control station for the working position and time information on the movement of the satellite tracking station, satellite, terrestrial, and then check and modify the values of the data that should be sent back to the satellite, each three times a day. Users (User segment), in addition to the GPS system users, including hardware, software, including technical methods that help to improve the quality of the receiver and position at the strategic value of the accuracy.The advantage and application of GPS systems.• Help to navigate from one place to another.• Assist in the tracking of the movement of the vehicle. People, animals and things • Assist in the improvement of accuracy of location data from a complex satellite.• Assist in the piece of land surveying and mapping geographic information database.• Mechanical controls in the agricultural sector.• Assist in the management of transportation• Support the strategic position of information services (Location Based Service) For example, the application of GPS 1. the use of GPS in mechanical control in agriculture to reduce labor problems. Increase speed and efficiency in managing the GPS system installed in the vehicle by the contractor for use in control. The drops of water, fertilizer, seeds, feed and precise map coordinates value, and the command program.
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