Independent Evaluation of the Leica GS18 T Tilt-Compensated GNSS RTK Rover

Smouha, Jonathan (2019) Independent Evaluation of the Leica GS18 T Tilt-Compensated GNSS RTK Rover. [USQ Project]

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The Leica GS18 T tilt compensated GNSS RTK rover was released by Leica Geosystems in 2018. This unit was the first tilt compensated rover to use an Inertial Navigation System (INS) to produce the tilt solution. This should allow the unit to operate free from magnetic interference and allow large tilt angles only limited by signals from satellites.

Leica tested the GS18 T and presented the results in a white paper and International Federation of Surveyors (FIG) conference paper (Luo et al 2018a & 2018b), introducing some claims about the unit. The claims of the papers were firstly, that the Leica GS18 T is immune to magnetic interference. Second, the unit can be use at tilt angles larger than 30° with a three-dimensional coordinate quality of approximately 20mm. Third, that the Leica GS18 T has a higher accuracy in strong multipath environments than previous GNSS rovers. Finally, that the unit can locate points hidden beneath objects and near buildings.

A thorough literature review into the technologies of the Leica GS18 T and alternatives to it found that an independent evaluation of the Leica GS18 T has not been performed. This dissertation sought to replicate their testing and test their claims.

In this project, tests were conducted over a permanent survey mark (PSM) and a control mark placed for testing with known coordinates. The testing involved collecting data from the Leica GS18 T and the Topcon HiPer HR, a magnetometer-based tilt compensated rover used for comparison purposes, using the known marks as control. Then the results were compared with the control and each other to test the claims.

The claims of the Leica GS18 T were mostly supported by the results of the research and some areas for further work and research were found.

The benefit of this dissertation is producing a robust and repeatable independent evaluation of the Leica GS18 T, that can be used a baseline for future testing and highlight areas that need attention in future research.

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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: 18 Aug 2021 04:52
Last Modified: 27 Jun 2023 04:05

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