Evaluation of Trimble Active Targets with an obstructed line of sight

Marriott, Phillip (2017) Evaluation of Trimble Active Targets with an obstructed line of sight. [USQ Project]

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This Dissertation evaluated the measurement ability, accuracy, precision and reliability of Trimble Active Targets when partially obstructed while using Automatic Target Recognition through a Trimble S5 instrument while drawing a direct comparison to traditional prisms through passive tracking. A secondary task was to determine if a reflection of an active target or passive target could be tracked and measured to. This was completed due to the lack of research on Trimble Active Targets with a need for a direct comparison to passive target tracking to confirm the manufacturers claims (Trimble Navigation Limited 2016).

The partial obstruction testing was completed by observing the three selected targets unobstructed then re measuring them through an obstruction to determine the error caused by the obstruction. The false tracking of reflection testing involved using the search function in the Trimble S5 to determine the likelihood of tracking a reflection. The instrument was then pointed to the reflection to determine if it could be tracked and if a distance could be measured to the reflection.

It was found in the partial obstruction testing that active targets emit a stronger tracking signal than the passive target tested and had a longer working range. The AT360 was found to be the most reliable with regards to measurement accuracy and precision while the MT1000 was problematic particularly with elevation errors when using active tracking, offset errors when using passive tracking and a noticeable loss of precision when obstructed by mesh or wet. The false tracking of reflection testing found that it was possible to track and measure a distance to a reflection of both active targets and passive targets resulting in a gross error making the measurement completely unusable. This was noticeably more likely to occur through a reflection from a mirror than regular glass.

From this research, it could be concluded that there are benefits and possible consequences from the use of active targets. Solutions to help minimise or mitigate the errors were found and deemed suitable for use by practising spatial science professionals when using this technology. This research is useful for determining the possible errors by measuring to active targets using Automatic Target Recognition when the line of sight is partially obstructed and the possibility of measuring a reflection of an active target, however it is limited to the use of the AT360 and MT1000, both manufactured by Trimble and observed by a Trimble S5 Total Station.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Spatial Science (Honours) (Surveying)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Gibbings, Peter
Date Deposited: 13 Sep 2022 03:06
Last Modified: 13 Sep 2022 03:06
Uncontrolled Keywords: Trimble Active Targets; obstruction; surveying
URI: https://sear.unisq.edu.au/id/eprint/40923

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