GPS What is it and how does it work
1. The original main purpose of GPS
GPS was originally created to provide accurate positioning for the military, and it is still operated by the US military. Military GPS products are mainly used to determine and track the coordinates of soldiers and weapons traveling in the wild, to provide navigation information for ships at sea, and to provide position and direction navigation information for military aircraft.
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2. GPS system is widely used
At this stage, the use of GPS systems has become very widespread. We can use GPS signals to carry out sea, air and ground navigation, missile guidance technology, high-precision positioning of geodetic and construction engineering measurements, and the speed of time transmission. and detection, etc. For the surveying and mapping engineering industry, GPS satellite positioning technology has long been used to create a high-performance national geodetic control network to measure international earth dynamic parameters;
Used to create land and ocean geodetic standards, carry out high-performance island land joint surveying and ocean surveying and mapping; used to detect the movement of earth plates and the internal curvature of the earth; used in construction engineering measurements, and become a tool for creating urban and engineering control networks important means. It is used to measure the camera position at the moment of shooting in aerospace projects, to complete the measurement and mapping with little or no ground control and to quickly produce maps, creating a scientific and technological revolution in space information systems and global environmental remote sensing monitoring.
Many commercial and government departments also use GPS equipment to track the location of their vehicles, which generally requires the use of wireless transmission technology. Some GPS signal receivers are equipped with voice recorders, wireless landline phones and mobile data terminals to meet the needs of company vehicle management.
3. The birth of a diversified stock resource environment
At this stage, systems such as GPS, GLONASS, and INMARSAT all have GPS navigation functions, forming a diversified stock resource environment. This diversified stock resource environment has promoted the formation of a common strategy for international folk customs, that is, on the one hand, flexible use of the current system, and on the other hand, proactive preparation of folk GNSS systems. By the time around 2010, the GNSS pure folk system will be completed. , the world will form a tripartite state of GPS/GLONASS/GNSS, only then can the dependence on a single system be solved from the source, and a secure network resource environment that is internationally shared and interoperable can be formed. Only then can the world enter the realm of maximum utilization of satellite navigation systems as a single navigation system. This policy of international folklore has actually influenced and driven the United States to make more open changes to its GPS application policy. All in all, the establishment of a diversified stock resource environment has created an unprecedented international environment for the rapid development and application of GPS.
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4. Development trend of GPS industry chain
In the future, GPS will produce industrial development like vehicles and communication networks at the current stage. The United States has developed the multi-source augmentation system WAAS (changing the push adjustment data link in the multi-source differential signal system into a geosynchronous satellite push, so that the geosynchronous satellites also have C/A code functions, resulting in a multi-source GPS augmentation system) program development For national standards. There are also some companies currently manufacturing vehicle-mounted GPS systems in our country. In order to develop our country's GPS industry chain, Wuhan City has already established the my country GPS Engineering Research Center.
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5. The use of GPS is entering the daily life of the public
In recent years, more and more GPS signal receivers that are affordable to the general public have appeared. With the development of technology, the functions of this equipment are gradually improved, and new functions occur almost every month. However, the price is falling and the specifications are becoming smaller and smaller. Two or three years ago, GPS equipment was as intimidating as handicrafts, but now consumers can finally have a long-awaited GPS receiver, which also comes with many excellent functions that they never dreamed of before.
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The price of consumer GPS handheld terminals ranges from a few hundred yuan to thousands of yuan, and they almost all have 12 parallel processing channels and information functions. Some can even be connected to a laptop, can submit/download GPS information, and use street-level map navigation, and can also track your location or navigate in real time on the PC screen.
The application of GPS signal receivers in people's lives is a vast world that cannot be predicted with data. Watch-type GPS receivers will become loyal tour guides for tourists. Although most people still don't know what GPS is, some people speculate that GPS will change everyone's living conditions. In the future, all launch vehicles will also depend on GPS. GPS has the same impact on people's lives as mobile phones, printers, computers and the Internet, and it will be indispensable in our daily lives.
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