Application Analysis of GNSS Control Network in High-altitude Long-distance Transmission Line Engineering
In order to meet the accuracy requirements of control points in high-altitude and long-distance transmission lines in transmission line projects,Global Navigation Satellite System(GNSS)control network has been studied.In the GNSS control network,the altitude and baseline length have little effect on the plan accuracy,which can meet the specification requirements.However,whether the elevation fitting results in plateau mountainous areas can meet the specification requirements needs to be verified.Therefore the elevation fitting results are verified and analyzed using two methods:planar fitting and surface fitting.After data processing,analysis,and on-site correction checks,the of surface fitting is better than that of planar fitting,and both results can meet the specification requirements.The research shows that for high-altitude and long-distance lines,surface fitting method should be优先 chosen for fitting.If there are insufficient starting points,the planar fitting method can be used for fitting,but the results need to be checked before proceeding with the work.
GNSS control networkdata processingelevation fitting
NETL
NSTL
万方数据
