The application of GPS survey in highway control network construction

GPS survey is based on the navigation and position system directed by satellite and is known to be of high precision and high speed.In the case of control survey from Pingshan Bridge to Tuanshi Highway in QuZhou,Zhejiang,triangle network was used for the layout of control net in field work and the relative location survey technique by GPS carrier phase analysis was used for the detailed measurement of points.In interior work,the baseline computation was used for baseline vector adjustment and the unconstrained and constrained adjustment for the control network.After the the error was adjusted,the relative dynamic positioning technique was used to compact the control points.The combined method can lead to the fast measurement of high precision of the highway control network.