The analysis of influence on lateral error of transfixion in GPS tunnel construction control network——Taking new Geleshan Tunnel in Chongqing as an Example

The article discussed the GPS measurement technology in specific applications of observations,data processing and achieved accuracy on construction control network retest in new Geleshan tunnel.Made preliminary estimation on lateral error of transfixion and feasible conclusions about measurement result.Some experience was accumulated about the role of GPS measurement technology in the long tunnel control measurement and draw some useful conclusions and suggestion.