Effect of time interval variations on RTK derived distances

Bein, Vincent (2015) Effect of time interval variations on RTK derived distances. [USQ Project]

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Abstract

The research problem statement was to determine if the time elapsed between observing the first and second point when using Real-Time Kinematic (RTK) Global Navigation Satellite System (GNSS) affected the accuracy and precision of a derived distance between the two points. In particular, this paper focussed on the Queensland cadastral system and RTK derived distances which are to be used on cadastral survey plans. Several days of RTK GNSS (GPS and GLONASS only) data was collected under laboratory type conditions. Several processing strategies and mathematical models were developed to work in conjunction with the zero-distance baseline method to determine distances and produce the results.

The results revealed the one minute data for the latitude distance error at 95% C.I. achieved ± 4.6mm at the 3 minute window and gradually decreased to ± 7.2mm at the
720 minute window and the longitude distance error achieved ± 4.7mm to ± 8.8mm respectively. The five second data ranged from ± 6.9mm to ± 8.6mm for latitude at the
95% C.I. from the 3 minute window to the 720 minute window and the longitude achieved ± 6.4mm to ± 9.0mm respectively.

The five second and one minute data results revealed that there are improvements to accuracy if points can be observed in quick succession. Waiting a pre-determined time between observing the same two points does not improve the accuracy of a derived distance when using a single-base RTK system and the GPS and GLONASS constellations.

In conclusion, the results achieved in this paper is the first step in determining what effects time has on RTK results that the practitioner would realise in their real-life field environment. This first step is vital in not only understanding, the time component of RTK at the field level but to aid in ensuring all economic benefits are realised in an ever-demanding environment and to provide the practitioner with necessary confidence to know the survey being undertaken complies with the survey standards. Further research using different satellite constellations is required for the profession to realise some economic benefit. If the practitioner can re-observe the same point while still located close then there are travel time savings, especially, in rural surveys.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Hons) project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Gibbings, Peter
Date Deposited: 31 May 2016 00:26
Last Modified: 05 Jun 2016 23:45
Uncontrolled Keywords: Real-Time Kinematic (RTK), Global Navigation Satellite System
Fields of Research : 09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying)
URI: http://eprints.usq.edu.au/id/eprint/29164

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