基于北斗CORS的铁路快速静态测量方法研究OA

Due to the poor quality of satellite signals in complex areas,the measurement technical standards in conventional areas are not applicable.In order to study the technical scheme of fast static measurement technology in complex environment,a series of measurement experiments were carried out by using the railway banded sparse Continuously Operating Reference Stations,and the measurement accuracy under different satellite systems and different observation duration was analyzed by using box plots and other methods.Compared with the results of railway control network,it is found that when the observation during 5 to 25 min and the solution is successful,there is little difference in the outer coincidence accuracy calculated by the fast static measurement results of GPS+BDS,GPS and BDS based CORS.The overall error in horizontal and vertical is better than 16 and 45 mm,which can meet the accuracy requirements of image control measurement.There is a case of solution failure,while the image control point which fails to solve has no significant relationship with its distance from the CORS station.With the increase of the observation time,the number of failure periods of solution decreases obviously.In addition,at the same observation time,GPS+BDS and BDS based on CORS have higher measurement accuracy,while GPS is relatively poor.For complex areas,it is feasible for the BDS-CORS system to replace GPS in the fast static measurement of railways.It is recommended that the duration of fast static measurement should be more than 25 minutes.