Layout Plan of GPS Control Network based on Bridge Construction Survey

It is the basis of the overall quality of construction to the bridge construction control network quality.The paper discussed the scheme design of GPS control network,accuracy determination,field layout process,and methods.It focused on the selection and identification of GPS coordinate reference,data processing.Aimmed to the fitting model parameter estimation of elevation data,proposed two-step robust estimation method of GPS height fitting,which effectively ensured the reliability of the geoid fitting model.