Mainly for positioning and navigation of moving objects such as ships, cars, and aircrafts. For example: 1. Vessel ocean navigation and entry and water diversion 2. Aircraft route guidance and approach and landing 3. Auto navigation 4. Ground vehicle tracking and urban intelligent traffic management 5. Emergency life-saving 6. Personal travel and field exploration 7. Personal communication Terminal (integrated with mobile phone, PDA, electronic map, etc.) 1. Time synchronization of electric power, post and telecommunications, communication and other networks 2. Accurate time input 3. Accurate frequency input 1. Geodetic survey of various levels, control survey 2. Road and various line stakeout 3. Underwater terrain measurement 4. Crustal deformation measurement, deformation monitoring of dams and large buildings 5. GIS application 6. Construction machinery (tire crane, bulldozer, etc.) control 7. Precision agriculture GPS Application in road engineering The application of GPS in road engineering is mainly used to establish various road engineering control networks and measure external control points of aerial survey. With the rapid development of high-grade highways, higher requirements have been placed on the survey technology. Due to the long lines and few known points, it is not only difficult to deploy the network with conventional measurement methods, but also difficult to meet the requirements of high precision. At present, GPS technology has been gradually established in China to establish the first-level high-precision control network of the line, and then the wire is encrypted by conventional methods. Practice has proved that the point error within a range of dozens of kilometers is only about 2 cm, which achieves the accuracy that is difficult to achieve by conventional methods, and also greatly shortens the construction period. GPS technology is also used in the control and measurement of extra-large bridges. Because it does not need to see through, it can form a strong mesh shape, improve the accuracy of the point position, and it is also very effective for detecting the fulcrum of conventional measurement. GPS technology also has broad application prospects in tunnel surveying. GPS surveying does not require sight-seeing and reduces the intermediate links of conventional methods. Therefore, it has high speed and high precision, and has obvious economic and social benefits. ◆Application of GPS in car navigation and traffic management Three-dimensional navigation is the primary function of GPS. Aircraft, ships, ground vehicles and pedestrians can all use GPS navigators to navigate. The car navigation system is a new GPS application technology developed on the basis of the global positioning system GPS. The car navigation system consists of GPS navigation, autonomous navigation, microprocessor, vehicle speed sensor, gyro sensor, CD-ROM drive, and LCD display. The combination of GPS navigation system and electronic map, radio communication network and computer vehicle management information system can realize many functions such as vehicle tracking and traffic management. ◆Application of GPS in long-distance passenger vehicle management (example) Take Yaxun long-distance passenger vehicle GPS intelligent management system, the first professional GPS long-distance passenger vehicle management system in China as an example, which combines satellite positioning technology, GPRS/CDMA communication Business, GIS technology, image acquisition technology, computer network and database technology, establish a general control (a combination of C/S structure and B/S structure) in the passenger transportation company, and set up other sub-controls, public security departments and transportation management departments, etc. Each department establishes a special control center system, which consists of four parts: control center system, wireless communication platform (GPRS/CDMA), global satellite positioning system (GPS), and vehicle-mounted equipment. It is an all-weather, full-range driver management and vehicle tracking system. Comprehensive platform; the system can implement dynamic tracking, monitoring, photographing, driving records, management, data analysis and other functions for registered vehicles, the monitored vehicles can be displayed on the electronic map, and the vehicle running track data can be saved; the operation terminal can arbitrarily select the inside of the server The center can be accessed by local area network or the Internet and can provide online integrated bus management data analysis and control system (B/S structure) through IE browser; and the system software and its capacity can be expanded at any time according to the hardware configuration of the center server and operating terminal, the maximum is 500,000 vehicles, the vehicles connected to the network can be not only long-distance passenger vehicles, but also social vehicles such as tourist vehicles. At the same time, the system can also adopt group management, and different types of vehicles are classified into different groups, which is convenient for management personnel to operate. Examples of the application of GPS technology in navigators International leading GPS navigator brand: Ahada - originated from Silicon Valley in the United States, and is now registered in China! Product core functions: 1) Map query ◎You can search the destination location you are going to on the operation terminal. ◎You can record the location information of the places you often go to, keep it, and share the location information with others. ◎Ambiguously query your accessories or nearby information such as gas stations, hotels, ATMs, etc. 2) Route planning ◎The GPS navigation system will automatically plan a route according to the starting point and destination you set. ◎Planning route can set whether to pass through certain waypoints. ◎Planning routes can set whether to avoid high-speed and other functions. 3) Automatic Navigation ◎Voice Navigation: Use voice to provide the driver with driving information such as intersection turn and navigation system status in advance, just like a guide who knows the way to tell you how to drive to the destination. One of the most important functions in navigation allows you to safely reach your destination through voice prompts without watching the operating terminal. ◎Screen Navigation: On the operation terminal, the map will be displayed, as well as the current position of the car, the driving speed, the distance to the destination, the planned route prompt, and the driving information of the intersection turning prompt. ◎Re-planning the route: When you do not follow the planned route, or go to the wrong intersection, the GPS navigation system will re-plan a new route for you to reach your destination based on your current location.

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