What does GPS mean

What does GPS mean

GPS means that there is an explanation for the system, and I'll talk about how it works for youFirst you can use GPS to find the way to go, the best routeAnd if your GPS system is equipped with anti-theft system, it is even more when the vehicle is stolen, you can determine the location of the vehicle, the role of theft

GPS principle24 GPS satellites orbiting the earth at an altitude of about 12 thousand kilometers from the ground, making it possible to observe more than 4 satellites at any point on the ground at any time, at any point in the.That due to the precise position of the satellite in the GPS observations, we can get the satellite to the receiver distance, the distance formula of three-dimensional coordinates, using 3 satellites, can be composed of 3 equations, solved observation point (X, Y, Z). Considering the error between the satellite clock and receiver clock, in fact there are 4 unknowns, X, Y, Z and clock, which requires the introduction of fourth satellites, the formation of 4 equations to solve, in order to get the observation points of latitude and longitude and elevation.In fact, the receiver can often be locked more than 4 satellites, then the receiver according to the distribution of the satellite constellation is divided into several groups, each group had 4 teeth, and then through the algorithm selected a set of minimum error for positioning, so as to improve the accuracy of.Due to the orbit of the satellite, the satellite clock error, the impact of the atmospheric troposphere and ionosphere on the signal, as well as the artificial SA protection policy, the positioning accuracy of civil GPS is only 100 meters. In order to improve the positioning accuracy, commonly used differential GPS (DGPS) technology, the establishment of base station (differential Taiwan) were observed in GPS, using the known exact coordinates of the base station, compared with the observed values, so that a number of amendments, and released. After receiving the correction, the receiver compares with the observed values, eliminates most of the errors, and obtains a more accurate position. The experimental results show that the positioning accuracy can be increased to 5 meters by using differential GPS.

The main purpose of the global positioning system: (1) land application, including vehicle navigation, emergency response, atmospheric physics, geophysical observation, resource exploration, engineering surveying, deformation monitoring, crustal movement monitoring, urban planning control; (2) marine applications, including ocean ship voyage ships, determination of optimal real-time scheduling and navigation, marine rescue, marine treasure, hydrogeological measurement and offshore platform positioning, sea-level monitoring; (3) aerospace applications, including aircraft navigation, remote sensing, attitude control of satellite orbit, missile guidance, air rescue and manned spacecraft protection detection etc..There are many types of GPS satellite receiver, according to the model is divided into geodetic type, total station, timing, handheld, integrated type; according to the use of vehicle type, ship borne, airborne, spaceborne, missile borne.After more than 20 years of practice, the GPS system is a high precision, all-weather and global radio navigation, positioning and timing of multi-functional system. GPS technology has developed into a multi domain, multi-mode, multi-purpose, multi model of international high-tech industries.

Global positioning system (GPS) is a new generation of space satellite navigation and positioning system developed by the United States Army, navy and air force in 70s of this century. Its main purpose is for land, sea and air of the three areas to provide real-time, all-weather and global navigation service, and for the information collection, nuclear monitoring and emergency communication etc. some military purposes, is an important component of the United States to dominate the global strategy. After more than 20 years of experimental research, costing $30 billion, by March 1994, the global coverage of up to 98% of the 24 GPS satellite constellation has been completed.The global positioning system consists of three parts: (1) the ground control part by the master station (responsible for the management and coordination work of the entire ground control systems), ground antennas (to the satellite into a message seeking in the master control station and monitoring station), (automatic data collection and Communication Center) auxiliary system (data transmission); (2) space, which is composed of 24 satellites, distributed in 6 road plane; (3) the user device part, mainly by the GPS receiver and satellite antenna.The main features of the global positioning system: (1) all-weather; (2) global coverage; (3) three dimensional constant speed timing high precision; (4) fast and time-saving high efficiency: (5) the application of a wide range of functions.

GPS prospectBecause of all-weather, high precision and automatic measurement of the characteristics of the GPS technology has, as an advanced measurement tools and new productivity, has been integrated into the national economic construction, national defense construction and social development in various applications.With the rapid development of the global economy and the end of the cold war, the U.S. government announced during 2000 to 2006, under the premise of ensuring national security is not threatened, cancel the SA policy, GPS civil signal precision is improved in the global scope, single point positioning by use of C/A code accuracy increased from 100 m to 20 m, application this will further promote GPS technology, improve productivity, work efficiency and scientific level and people's quality of life, stimulate the growth of the GPS market. According to experts predict that in the United States, just the car GPS navigation system, after 2000 the market will reach $3 billion, while in China, the car navigation market will reach 5 billion yuan. Visible, GPS technology market prospects are very impressive.