Performance evaluation of a tracking total station as a position reference for dynamic GNSS accuracy testing

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3 Scopus citations

Abstract

The dynamic accuracy of a tracking total station (TTS) was evaluated using a rotary test fixture to determine the viability of using a TTS as a position reference for dynamic global navigation satellite-based system (GNSS) accuracy testing. Tests were performed at angular velocities ranging from 0 to 3.72 rad/s at a radius of 0.635 m. A technique was developed to determine the average latency of the TTS measurement serial data output. TTS measurements were interpolated at a GNSS sampling interval to provide a method for direct comparison between TTS and GNSS position measurements. The estimated latency from the TTS serial data output was shown to be consistently near 0.25 s for all angular velocities and less variable when using a reflector-based machine target versus a prism-based target. Average positional error in the TTS position measurement increased with angular velocity from 3 to 90 mm, partly due to internal filtering which caused the magnitude of the TTS position measurement to decrease under stead-state sinusoidal motion. The standard deviation of error ranged from less than 1 to 20 mm as angular velocity increased. Sight distance from the TTS to the target was shown to have very little effect on accuracy between 4 and 30 m. The TTS was determined to be an adequate benchmark for most dynamic GNSS and vehicle auto-guidance testing but is limited by relatively large position measurement errors at high angular velocities.

Original languageEnglish
Pages (from-to)557-563
Number of pages7
JournalApplied Engineering in Agriculture
Volume30
Issue number4
DOIs
StatePublished - 2014

Bibliographical note

Publisher Copyright:
© 2014 American Society of Agricultural and Biological Engineers

Keywords

  • Dynamic error
  • GNSS
  • GPS
  • Precision agriculture
  • Tracking total station

ASJC Scopus subject areas

  • Engineering (all)

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