In case of previous RTK GPS measurement, two GPS receivers are installed on basing and unknown points to determine actual position of unknown point. Therefore, the level of error increases with increase in the distance from reference station. Accordingly, the NGII has been providing VRS service, whi...
In case of previous RTK GPS measurement, two GPS receivers are installed on basing and unknown points to determine actual position of unknown point. Therefore, the level of error increases with increase in the distance from reference station. Accordingly, the NGII has been providing VRS service, which is a type of network RTK, since 2007 to determine accurate location on real time basis. VRS service, however, needs to maintain connection to VRS by using communication device to do so. Moreover, the number of users, who can make connection, are very limited by capability of the server. To sort out such problem, NGII has been providing FKP service, which is not restricted by the number of concurrent connected user, since November in 2012. However, despite a merit of FKP, which is unlimited service, there have not been sufficient studies carried out to verify accuracy and stability therefore the range of fusibility is not being expanded well.
In this sense, this study has been carried out to analysis accuracy by measuring VRS and obtaining KFP data on base point of integration and urban control point with good GNSS receiving environment based on relevant regulation to deduct the status of utilization of public service of each network RTk measurement technique. Firstly, data on the integration and urban control points have been obtained based on the results from analysis on RTK horizontal direction. Further, measurement has been carried out according to relevant regulation. The results indicate that all accuracies have been within 5cm, which are very stable, irrespective of the type of measurement technique. However, various stations, which have been measured through FKP method, have not been satisfied relevant regulations as well as the level of differences in accuracy has been relatively large. Secondly, the results from analysis on ortho-metric height by each measurement technique, which have been calculated by using KNGeoid13 model provided by NGII based on coordinate according to the results from analysis on Network RTK vertical direction, indicate that the ortho-metric height measured through VRS measurement can be used. However, allowable tolerance of the height has been found to stray from allowed tolerance. Therefore, it would be difficult to use it as it is. Thirdly, in case of analysis on the decision time of ambiguous time, FKP method requires more times than VRS method. Therefore, it would be hard to perform network RTK measurement through FKP method regarding efficiency. Further, in regard to various elements, the elements of error correction generated from the internal system of FKP are more inaccurate than VRS therefore FKP system needs to be examined. Finally, FKP has many problems due to lack of system but a lot of restrictions can be caused by using VRS method only for continuous measurement in general construction sites. Therefore, if FKP method can be stabilized, such method will be used more in the future.
In case of previous RTK GPS measurement, two GPS receivers are installed on basing and unknown points to determine actual position of unknown point. Therefore, the level of error increases with increase in the distance from reference station. Accordingly, the NGII has been providing VRS service, which is a type of network RTK, since 2007 to determine accurate location on real time basis. VRS service, however, needs to maintain connection to VRS by using communication device to do so. Moreover, the number of users, who can make connection, are very limited by capability of the server. To sort out such problem, NGII has been providing FKP service, which is not restricted by the number of concurrent connected user, since November in 2012. However, despite a merit of FKP, which is unlimited service, there have not been sufficient studies carried out to verify accuracy and stability therefore the range of fusibility is not being expanded well.
In this sense, this study has been carried out to analysis accuracy by measuring VRS and obtaining KFP data on base point of integration and urban control point with good GNSS receiving environment based on relevant regulation to deduct the status of utilization of public service of each network RTk measurement technique. Firstly, data on the integration and urban control points have been obtained based on the results from analysis on RTK horizontal direction. Further, measurement has been carried out according to relevant regulation. The results indicate that all accuracies have been within 5cm, which are very stable, irrespective of the type of measurement technique. However, various stations, which have been measured through FKP method, have not been satisfied relevant regulations as well as the level of differences in accuracy has been relatively large. Secondly, the results from analysis on ortho-metric height by each measurement technique, which have been calculated by using KNGeoid13 model provided by NGII based on coordinate according to the results from analysis on Network RTK vertical direction, indicate that the ortho-metric height measured through VRS measurement can be used. However, allowable tolerance of the height has been found to stray from allowed tolerance. Therefore, it would be difficult to use it as it is. Thirdly, in case of analysis on the decision time of ambiguous time, FKP method requires more times than VRS method. Therefore, it would be hard to perform network RTK measurement through FKP method regarding efficiency. Further, in regard to various elements, the elements of error correction generated from the internal system of FKP are more inaccurate than VRS therefore FKP system needs to be examined. Finally, FKP has many problems due to lack of system but a lot of restrictions can be caused by using VRS method only for continuous measurement in general construction sites. Therefore, if FKP method can be stabilized, such method will be used more in the future.
주제어
#VRS
#FKP
#공공측량
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