gprs定位（GPRS positioning）.docVIP

gprs定位（GPRS positioning） Application of GPS satellite positioning system GPS is the global positioning system, which is a new generation of satellite navigation and positioning system based on the development of modern science and technology. Currently, GPS satellite positioning technology is widely used in mapping, navigation, communication and other related fields. With the continuous improvement of GPS satellite positioning technology, its application scope will be popular and go deep into the various fields of national economic construction and Peoples Daily life, present a new world for spatial information dynamic positioning. (a) : (1) the history of GPS satellite positioning technology is on October 4, 1957, the Soviet union successfully launched its first man-made earth satellite in the world, and marks the space for the development of science and technology into a new era. (2) 1966-1972, the national geodetic survey bureau and the federal republic of Germany in the UK under the coordination of the department of surveying and mapping, with the satellite triangulation method, the layout of the instrument with a 45 global triangulation, obtain the positional accuracy of + / - 5 m. However, this observation method by satellite visibility conditions and the influence of the weather, observation and calculation requires a lot of time, not only low positioning accuracy, and cant get the geocentric coordinate points. Therefore, this method was quickly replaced by satellite doppler positioning technology. Global positioning system (GPS) consists of three parts: (1) the ground control part, by the main control station (shall be responsible for the management and coordination of the whole ground control system), ground antenna (under the control of the master station, to the satellite cables), monitoring stations (data automatic collecting center) and communications support system (data); (2) the space portion, consisting of 24 satellites, is distributed in 6 horizont