| Summary: | Deformation monitoring network needs to be well designed to meet the criteria of accuracy, reliability and more importantly sensitivity criteria. More specifically, in the deformation study, sensitivity analysis of the deformation monitoring networks needs to be conducted in order the monitoring networks to be able to detect the occurrence of deformation or movement. The use of sensitivity analysis of GPS vector in developing an optimization design for deformation monitoring network has been demonstrated by Tzur (2002). The optimization design of GPS vector was developed by involving previous deformation information such as the known deformation velocity. It is interesting, considering that in addition to obtaining a sensitive network, measurement costs can also be reduced. This study implements an optimization design, specifically the sensitivity criteria developed by Tzur (2002) on a GPS network consisting of five monitoring points. The network design is carried out with four schemes, using different deformation velocity values of 5 mm and 10 mm. To validate the results of the GPS network design, a simulation of a displacement given at a certain point was carried out. Furthermore, a displacement test is performed on the network. The results show that by using all ten (10) baselines, this network has not been sensitive enough to detect displacement of 5 mm. In accordance with the results of the displacement test, the simulated displacement values up to 6 mm is not detected. Based on sensitivity analysis, to detect a deformation of 10 mm can be used only four baselines with the most significant contribution to the sensitivity of the network; but a displacement simulation of 15 mm is not detected. The baseline that is tied directly to the reference point and has good accuracy, has a high contribution to the network sensitivity. However, this needs to be studied further by using a network with more number of points and number of reference points.
|
|---|