Reliability Check of Known Points on the GPS Control Network

The reliability of known points directly influenced the precision of GPS positioning data in GPS network establishment.Besides network must be optimized and GPS survey specification must be followed,to acquire high quality GPS positioning result,the reliability of known points in GPS network must be verified.So that known points with gross error can be found and eliminated in order to improve the network precision.Hereby,this paper introduced three kinds of known points' reliability check methods,such as regression analysis,actual measurement baseline comparison and constraint adjustment method.