Features of GPS
system
1. Global, all-weather and continuous navigation capabilities
GPS can provide continuous, all-weather navigation capabilities for all kinds of users anywhere in the world or in near-Earth space, users do not need to transmit signals, Therefore, it can satisfy an infinite number of users.
2. Real-time navigation, high positioning accuracy, and a lot of data content
When GPS positioning is used, position data can be obtained several times within 1/s. This near real-time navigation capability is very useful for highly dynamic users. It is of great significance. At the same time, it can provide users with continuous three-dimensional position, three-dimensional speed and accurate time information. At present, the real-time positioning accuracy using C/A code can reach 20-50m, and the speed accuracy is 0.1/s. 0.005m/s, relative positioning can reach millimeter level.
With the continuous improvement of the GPS system and the continuous updating of the software, at present, the relative static positioning within 20KM only takes 15-20 minutes; When the distance is within 15KM, the observation time of the rover station only takes 1-2 minutes, and then it can be positioned at any time, and the observation at each station only takes a few seconds.
3. Strong anti-interference ability and good confidentiality
GPS adopts spread spectrum technology and pseudo-code technology, users only need to receive GPS signals, they will not transmit signals themselves, so they will not be affected by other interference from the signal source.
4. Multi-function and wide range of uses
GPS is a dual-use system for both military and civilians, and its application range is extremely wide. Forestry, water conservancy, transportation, aviation, surveying and mapping, security, military, electric power, communications, and urban areas, especially the monitoring of ground moving targets, are the most representative and forward-looking in GPS applications.