Evaluation of VRS-RTK GPS latency in a dynamic environment

Inglis, Rientz (2006) Evaluation of VRS-RTK GPS latency in a dynamic environment. [USQ Project] (Unpublished)

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Abstract

This research project investigates the effects of latency in dynamic GPS (Global Positioning System) measurements made within a Virtual Reference Station (VRS) – Real Time Kinematic (RTK) network. The test method, which has been devised as an integral part of this research, allows for determination of the effects of latency in low speed dynamic VRS measurements. The method utilises a utility vehicle as a dynamic platform for testing, with a barcode reader attached to the vehicle to read barcodes which have been fixed to posts adjacent to the test path. Mounted in vertical alignment with the reader is the GPS antenna, providing the GPS signals to allow the GPS receiver(s) on board to determine the position of the vehicle as it passes the fixed barcodes and thereby providing a fixed frame of reference for the measurement of latency. Measuring lines in each direction and comparing the apparent position of the barcodes allows for the determination of latency. Conducting the testing procedure over a range of speeds will also facilitate the investigation of the relationship between platform speed and latency error. The results of this research have implications for any machine guidance and precision agriculture applications intending to use the VRS network where data accuracy is a major consideration. If the latency present in the positioning system has been quantified, it becomes possible to correct for this position error in real time. The research has only considered the effects of latency on the position solution, and this should be distinguished from accuracy. The accuracy of the VRS system in dynamic applications has not been investigated as part of this research project, but should also be considered in conjunction with latency when investigating the suitability of VRS to potential applications, dynamic or static.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information
Date Deposited: 11 Oct 2007 01:00
Last Modified: 02 Jul 2013 22:43
Uncontrolled Keywords: global positioning system (GPS); virtual reference station (VRS); real time kinematic (RTK); latency; trimble; TSCe
Fields of Research (FOR2008): 09 Engineering > 0909 Geomatic Engineering > 090903 Geospatial Information Systems
URI: http://eprints.usq.edu.au/id/eprint/2242

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