GPS Global Positioning System. as a global positioning system satellite. History from the design and construction of the Ministry of defence of the countries United States. At the beginning of the year 1970 is famous as a Navigation Signal Timing and that Global Positioning System Ranging (NAVSTAR GPS) GPS is a system that can be used to find the location on the world in all weather conditions, 24. Hours and used all over the world. GPS tuner Source http://www.thailandoffroad.com/jeep/board/Question_backup2009.asp?ID=J27613GPS consists of three major elements. 1. space (Space segment). 2. the control station (Control segment). 3. the user (User segment).Best space (Space segment) consists of Satellite khotronop Earth Sun Moon 21 24 operating 3 backup using the 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. Source: http://new.gistda.or.th/teaching/index.php/download-file-/doc_details/27--gps Communications satellites use radio frequencies consist of 2 waves L1 1575.42 MHz frequency is and the waves L2 1227.60 MHz frequency.Source: http://new.gistda.or.th/teaching/index.php/download-file-/doc_details/27--gpsControl station (Control segment).Include the ground-station 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. Source: http://new.gistda.or.th/teaching/index.php/download-file-/doc_details/27--gps 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. Source: http://new.gistda.or.th/teaching/index.php/download-file-/doc_details/27--gpsUsers (User segment). Users, which in addition to the GPS 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)• Other The use of GPS navigation in the car.Source: http://zulexelectronics.com/thai/index.php?option=com_content&task=view&id=958&Itemid=0For 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.Car contractor control drops the seeds, salad mold Source: http://new.gistda.or.th/teaching/index.php/download-file-/doc_details/27--gps 2. the application of GPS to the transportation and traffic. There are applications in the transport of goods by means of GPS used to control system of transport. Make a note of the current address of the transport between work or maybe used. The traffic report. Where there are accidents or construction to connect information with Google Earth to see the actual condition, and currently used as a navigation system in the car.GPS used to track transport Source: http://new.gistda.or.th/teaching/index.php/download-file-/doc_details/27--gps 3. the application of GPS to provide location-oriented information service is used in conjunction with GPS systems, mobile phone network services to increase profits through advertising space-oriented information through mobile phones. GPS in mobile phones. Source: http://www.nokia.co.th/ The future of the global positioning system. At present, in addition to the GPS satellite system of the United States, the country with a satellite system that developed many systems such as GLONASS of the country Russia. The European Union's GALILEO IRNSS of India and China's COMPASS, country, etc., allow several satellite how to lead one of the world's satellite system GNSS (Global NavigationSatellite Systems):
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