Detection and analysis of disruption or discontinuities to Continuously Operating Reference Stations (CORS)

Egan, Joshua (2019) Detection and analysis of disruption or discontinuities to Continuously Operating Reference Stations (CORS). [USQ Project]

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The surveying profession, along with the wider spatial science industry are currently areas of very high demand and continual evolvement. Continuously Operating Reference Stations (CORS) are one of the most useful and heavily exploited tools within the spatial industry. CORS support the ever-increasing requirements of accuracy, whilst making works more efficient, not only in surveying but also numerous other industries.

During the continued use of equipment, it is inevitable that discontinuities, errors or failures occur, CORS are not immune to these. Recently network operators have experienced a higher than normal failure rate of equipment, leading to numerous CORS sites receiving equipment replacement. Currently the subject matter experts within Australia are Geoscience Australia, who investigate CORS data on a case by case basis through manual analysis.

The literature review performed found that only a very limited number of papers investigate the analysis of discontinuities within CORS, even more so specifically the analysis of data where a discontinuity had not been identified. This project aimed to determine if the change of equipment at a CORS site had any adverse effects to the data being recorded, if different monumentations styles could be classed with positional uncertainties, and also the possibility of automating the detection of any CORS discontinuities.

Through the use of five subject CORS sites where known events had occurred, commercial survey software was used to produce numerous plots for analysis. The first major finding of the analysis was that all of the sites which experienced a change of antenna, had their north orientation changed, one of which by approximately 150°. A change in Signal to Noise Ratio (SNR) was also evident at multiple stations, the most interesting case involving the removal of vegetation from the antenna. Another was that the positional uncertainty of stations remained fairly stable, even though some stations coordinates were significantly displaced by the events. It was also found that precise navigation files sourced from the International GNSS Service, contained errors leading to the complete deterioration of CORS data.

The benefits of this project are that it continues to expand the limited number of resources available relating to the operation of CORS, specifically the identification of discontinuities. It shows that even through the use of commercial software the positive identification of irregularities in data is possible. This may allow network operators and future research to formulate automated and remote monitoring of stations.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: McAlister, Chris
Qualification: Bachelor of Spatial Science (Honours) (Surveying)
Date Deposited: 26 Aug 2021 00:46
Last Modified: 26 Jun 2023 22:28

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