For the engineering project with on

For the engineering project with only 80 or 54 coordinates of the known points, the 84 coordinates of the known points must be determined first, which is used to solve the coordinate transformation parameters. At this time, it is required that the reference station can be placed on a known point, on a waiting point, or even on a temporary point, but it must be positioned at a single point to determine the position of the reference stationGenerally, 10 minutes of observation data is enough. The mobile station must first go to the known points for mobile observation, obtain 84 coordinates of all known points, and then solve the coordinate transformation parameters through common point matching in GPS-RTK system. With the conversion parameters, we can go to the observation point in turn. For highway projects without GPS-RTK control network, this kind of operation mode is generally required.Since the placement of the reference station is optional, it should meet the following requirements:(1) There are no obvious obstacles and electromagnetic interference around the point, which is conducive to the reception of satellite signals.