The space (Space segment) consists of 24 satellites orbiting the Earth 21 operational satellites reserve three satellites floating in orbit about. 20,000 kilometers rotation Voyager 1's orbit takes 12-hour orbit with all orbit six satellites each orbit four satellites to calculate positions accurate coordinates of the GPS Receiver, the Receiver on Earth. The satellite will use atomic clocks, atomic clocks, cesium and rubidium atomic clocks, two houses, two outbuildings and
a control station (Control segment) including ground stations that control the system. Scattered in different parts of the world to act to improve satellite data is accurate and up to date at all times. Divided into
one. The main control station
2. Satellite tracking station GPS satellite tracking at all times act
three. Station transceiver
to work. The main control station to get information where and when the movement of the satellite, but satellite tracking station. Then, check and adjust the accuracy of the information should be sent back to the satellite three times daily
users (User segment) users, which will mean users GPS system yet. including hardware, software and technical methods. Which contribute to improving the quality of the reception better. And the positioning accuracy is more accurate
and useful applications of GPS systems
• Navigation from one place to another as needed
•. It helps to track the movement of vehicles, people, animals and objects
• help to improve the accuracy of positioning data from satellite
•. Help in surveying, mapping and GIS database creation
•. In mechanical control in agriculture
•. Help in the management of transport
•. Support, information service oriented positions (Location Based Service)
application example GPS
1. Using GPS to control machinery on the farm. Reduce labor problems Add convenience and efficiency in management. By installing a GPS system in a car, a tractor used to control sowing, fertilizer, irrigation, sowing and harvesting. With the precise coordinates on the map and command program.