Improving Network Integrity of Finnish Permanent GNSS Network FinnRef
Tenhunen, Tomi (2014)
Tenhunen, Tomi
Metropolia Ammattikorkeakoulu
2014
All rights reserved
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201405208671
https://urn.fi/URN:NBN:fi:amk-201405208671
Tiivistelmä
The Finnish permanent GNSS (Global Navigation Satellite System) network FinnRef has been the backbone of the Finnish coordinate system for over twenty years. It has been also used for research purposes in the Finnish Geodetic Institute (FGI), which operates the system. The system consists of 13 stations, which are located around Finland.
FinnRef has been suffering from reliability problems during the recent years due to aging equipment and infrastructure, and now the original system is about to be renewed. The renewal concerns the specialized equipment, as well as the infrastructure including the network. This thesis gives an answer to the research question “What can be done to improve the reliability of Finnish permanent GNSS network FinnRef?”, and the results will be implemented for the use of the FinnRef system.
This thesis approaches the system upgrade from the network analysis view point offered by James D. McCabe. The process is very comprehensive and seizes the details together within the larger picture, which many network analysis processes seem to forget to do. The problems of the system combined with the requirements set by the users, applications, devices and network are reviewed. Through the analysis of those requirements the answer to the research question is found in the form of a set of recommendations. The analysis also produces the requirements list, data flow map and more reliable network.
The thesis describes the analysis and renovation process and the results. The thesis and its results were reviewed by the FGI’s IT manager to ensure the validity.
The whole system along with its problems is reviewed and the transferred data is studied to understand purpose of the system to define the requirements. The reliability is increased due to many improvements. These improvements are for example station power improvements, remote power control and the core network between stations and FGI, which has been changed from VPN (Virtual Private Network) over Internet to more robust and simple MPLS (Multiprotocol Label Switching) network.
This thesis also discusses the importance of the sufficient human resources in the operation and maintenance of the system, together with the well-organized documentation, project leading and operation procedures. All of this has a major impact on the system reliability, since it keeps the system in a constantly evolving state and if the system encounters a critical (or non-critical) issue, there is a clear vision on what should be done to limit and solve the problem with minimum disturbance to the overall system reliability.
FinnRef has been suffering from reliability problems during the recent years due to aging equipment and infrastructure, and now the original system is about to be renewed. The renewal concerns the specialized equipment, as well as the infrastructure including the network. This thesis gives an answer to the research question “What can be done to improve the reliability of Finnish permanent GNSS network FinnRef?”, and the results will be implemented for the use of the FinnRef system.
This thesis approaches the system upgrade from the network analysis view point offered by James D. McCabe. The process is very comprehensive and seizes the details together within the larger picture, which many network analysis processes seem to forget to do. The problems of the system combined with the requirements set by the users, applications, devices and network are reviewed. Through the analysis of those requirements the answer to the research question is found in the form of a set of recommendations. The analysis also produces the requirements list, data flow map and more reliable network.
The thesis describes the analysis and renovation process and the results. The thesis and its results were reviewed by the FGI’s IT manager to ensure the validity.
The whole system along with its problems is reviewed and the transferred data is studied to understand purpose of the system to define the requirements. The reliability is increased due to many improvements. These improvements are for example station power improvements, remote power control and the core network between stations and FGI, which has been changed from VPN (Virtual Private Network) over Internet to more robust and simple MPLS (Multiprotocol Label Switching) network.
This thesis also discusses the importance of the sufficient human resources in the operation and maintenance of the system, together with the well-organized documentation, project leading and operation procedures. All of this has a major impact on the system reliability, since it keeps the system in a constantly evolving state and if the system encounters a critical (or non-critical) issue, there is a clear vision on what should be done to limit and solve the problem with minimum disturbance to the overall system reliability.