GPS is the most successful satellite positioning system and is known as a milestone in human positioning technology. In summary, the system has the following characteristics

　　(1) Global, continuous navigation positioning capabilities around the weather. GPS can provide continuous and all -weather navigation positioning capabilities for any types of users around or nearly space. Users do not need to transmit signals, so they can meet multi -user use.

　　(2) Real -time navigation, high positioning accuracy, short observation time. When using GPS positioning, you can obtain several location data in 1S. This almost real -time navigation ability is of great significance for high -dynamic users. At the same time, it can provide users with continuous three -dimensional positions, three -dimensional speed and accurate time information. The real-time positioning accuracy of the C/A code can reach 20-50m and the speed accuracy is 0.1m/s. The special treatment can reach 0.005m/s, and the relative positioning accuracy can reach the level of millimeter.

　　With the continuous improvement of the GPS system and the continuous update of the software, the relatively static positioning within 20km only costs 15-20min. When the fast static relative positioning measurement measurement is measured, when each mobile station and the benchmark station are within 15km, the observation time of the mobile station is only observation time It takes 1-2min, and then it can be located at any time, only a few seconds of observation per station.

　　(3) There is no need for the measurement station: GPS measurement is to be widely opened on the measured stations, and it is not required to see each other between the measured stations. Therefore, it can save a lot of bidding costs To. Because there is no need to be interstitial, the point position can be dense and dense as needed, so that the selection point work is very flexible, and it can also save the measurement of the passage point and the transition point in the classic measurement.

　　(4) Can provide a global unified three -dimensional heart coordinates: GPS measurement can accurately measure the plane position and earth heights of the measurement station at the same time. GPS level can meet the accuracy of fourth-level measurement. In addition, GPS positioning is calculated in the global unified WGS-84 coordinate system, so the measurement results in different places worldwide are interrelated

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