First Results Using the New DGPS Real-Time Deformation Monitoring System DREAMS

Guenter Hein and Bernhard Riedl

Abstract:	At the Institute of Geodesy and Navigation (IfEN) a high- precision DGPS based deformation monitoring system has been built-up. It is called DREAMS (Differential REAl-time Monitoring System) and has the capability to monitor continuously all kinds of man-made and natural structures where the early detection of possible movements may prevent disasters. Its main objective is not only to allow the user to watch the time- line updated in real-time on the screen, but more important, it gives him a tool at hand that supports him in deciding in or near real-time whether the monitored object has moved significantly or not. The software is currently available as a standard DOS application. Due to DOS memory limitations the software has been ported to LINUX (a PC UNIX) using the same hardware as for the DOS version and it will be soon available for Windows NT and the upcoming Windows 95. So there are no limitations for future applications or larger networks that may need more memory or computing power. Also the use of multiprocessor systems is possible. First results obtained with this new system have proven its high precision. Initial tests were carried out using two stations. In order to generate a vertical deformation, the receiver of the monitor station was fixed on a slide for precise 3D movements. The collected and evaluated data show that the system is capable of reaching the millimeter level accuracy and better. This new system overcomes the disadvantages of the post-mission static GPS analysis concept commonly used and might gain more insights into the short-time behaviour of deformation objects. This is especially due to its real-time capabilities, the high portability and the high update rates (up to 20 Hz). This paper presents this new sophisticated system, outlines the algorithms, the software and hardware architecture as well as reports from first experiences in the field.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1467 - 1475
Cite this article:	Hein, Guenter, Riedl, Bernhard, "First Results Using the New DGPS Real-Time Deformation Monitoring System DREAMS," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1467-1475.
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