GNSS (Global N**igation Satellite System) is a technology that uses satellites for navigation and positioning. The GNSS system has the following advantages:
GNSS positioning accuracy is high, and it can reach the centimeter level.
It can provide positioning, speed measurement and timing services around the clock and all day.
It has a wide coverage area and its signal can be received by all corners of the globe.
It can realize precise positioning and velocity measurement of the target, and can provide high-precision three-dimensional position, speed and time information around the clock and all day.
1. Geodesy.
Geodetic survey is the foundation of surveying and mapping work, an important means of national economic construction, national defense construction, and scientific research, and is also the basis of other surveying and mapping work. The purpose of geodesy is to establish an accurate three-dimensional geodetic model of a certain scale, which involves the shape of the earth, the ellipsoid of the earth and various geodetic data. GNSS receivers can provide accurate 3D positioning of 3-5 meters, and it can obtain one or more positions and elevations at the same time. In many fields, such as engineering surveying, GPS-assisted surveying, etc., GNSS receivers are needed to obtain results, that is, GNSS receivers are used to conduct geodetic surveys.
2. Engineering surveying.
1. Topographic surveying and mapping: by measuring a certain area, establishing a terrain model according to the existing coordinate system, and measuring the coordinate system of the area; Or establish 3D coordinates based on known points and conduct 3D topographic surveys.
2. Engineering lofting: lofting the building to determine its plane position and elevation; It is also possible to measure the building and determine its location coordinates.
3. Elevation measurement: use the elevation of known points to measure ground targets.
4. Deformation monitoring: Through the use of GNSS system, an accurate three-dimensional coordinate system can be established to monitor the deformation of the ground in real time.
5. Engineering lofting: The three-dimensional coordinates of the ground point can be collected through the GNSS system, and the position and deformation of underground structures, tunnels, roadbeds, etc. can be determined in real time.
3. Precision agriculture.
The application of GNSS receiver in agriculture is mainly through the monitoring of farmland environment to achieve the purpose of monitoring crop yield and soil fertility and precise irrigation.
Fourth, intelligent robots.
GNSS technology is used in intelligent robots, which can inject human thinking and wisdom into the robot, so that it has the ability to think and act independently, so as to realize the intelligent behavior of the robot. For example, the "Boeing" intelligent robot developed by Boeing in the United States uses GNSS technology.
The GNSS system mainly consists of five parts: the satellite navigation system (i.e., the space part), the ground control system (i.e., the ground tracking station part), the data processing center (i.e., the data communication part), the user terminal and the application software. Through these parts, a complete intelligent robot is a whole. In addition, in the GNSS system, a device called navigation software is installed on each satellite to calculate the signals transmitted on the satellite, so as to obtain navigation and positioning information.
5. Deformation monitoring.
Deformation monitoring refers to the monitoring of the deformation of objects under the action of external forces. During the construction and operation of construction projects, buildings may be displaced, deformed, damaged or collapsed due to external factors, and they need to be observed and analyzed to determine their stability. If the deformation is stable, it indicates that the building itself is of good quality and structurally safe; If the deformation is unstable, it indicates that the building is of poor quality and there is a safety hazard.