Establishment of measurement network of displacement of buildings in urban area using GPS technique

为了制作VRS数据，需要使用日本地理空间信息管理局的电子参考点数据。在本项目开始时，建立了数据采集软件。其精度对标准GPS传感器与测量点GPS传感器之间的距离有很强的依赖性。因此，为了获得准确的数据，利用相对较近的多个标准点的数据建立了虚拟观测点。这个问题的程序已经审查和确立。使用8个GPS天线，虚拟参考点覆盖整个东京地区。验证了虚拟参考数据的高精度。在此基础上，实现了在精度上的显著提升。

For making the VRS data, it is needed to use the data at electronic reference point by the Geospatial Information Authority of Japan. At the beginning of this project, the software for data acquisition was established. The accuracy has strong dependency on the distance between the standard GPS sensor and the GPS sensors at the measuring point. So, to get the accurate data, the virtual stand point was established using the data at the relatively-near multi standard points. The procedure for this matter was examined and established. Using the 8 GPS antennas, the virtual reference points cover the whole Tokyo area. Then the high accuracy of virtual reference data was confirmed. Then the significant advancement on the accuracy could be achieved on this project.