REMOTE TRANSFER SYSTEM FOR ACQUIRED GEOPHYSICAL DATA

Purpose. The purpose of the paper is to create a system for automatic transferring and storing geophysical data acquired remotely, and to provide an on-line access to them. Presented here is a methodology of creating the server part of the system for a secure, authorized on-line access to the data acquired remotely and transferred by the "Vistun" device. Design/methodology/approach. The system operates as follows. A digital geophysical instrument acquires data at a measurement site. This instrument is connected to a data transfer device which automatically creates a data file and sends it to the destination server. At the receiving side appropriate servers are located for data automatic receiving and storing. All servers are run under the Linux UNIX-like operating system and are customized according to the assignment. Data are transferred via the FTP protocol and are appropriately collected and stored by a FTP-server. The FTP service runs continuously, so it is always ready to receive data. For security reason the FTP-server was configured with three virtual users: one for writing down field data into a repository, the other two for accessing them. Each virtual user has his own configuration settings and access rights depending on the tasks. All settings of the FTP-server are stored in the MySQL. Findings. Via the computer powered by Linux OS, a FTP-server “vsftpd” was put in operation; appropriate virtual users were created with required rights to access the data and computer resource. For storing the settings and authentication of the users, in the system an appropriate database under the MySQL was used. The described system was implemented for transferring data of electrical field measurements at a permanent geophysical station “Nyzhne Selyshche” (Zakarpattya Region). Analysing the obtained data, we defected some errors in the acquired signals. It allows us to reveal a failure of the remote measuring instrument. The results of testing confirm that the suggested system allows one to transfer and store geophysical data automatically, along with remotely defecting some miss-functionality. The authorized users can access the data on-line. Practical value/implications. The developed automatic system for remote transfer of geophysical data using GPRS technology based on the GSM net allows one to transfer data from any measurement site on Ukraine the territory of Ukraine to file server. An appropriately configured server also provides secure receiving and storing of the information on-line. The system is flexible enough allow one to customize it to various tasks. It can be used for monitoring geophysical media, as well as for short-term field observations in hazardous environment.