NDLI: A new system for RTK performance evaluation

Content Provider	IEEE Xplore Digital Library
Author	Riley, S. Talbot, N. Kirk, G.
Copyright Year	2000
Description	Author affiliation: Trimble Navigation Ltd., Sunnyvale, CA, USA (Riley, S.)
Abstract	Real-time kinematic (RTK) systems use GPS signals to deliver almost instantaneous positions with centimeter-level accuracy. RTK techniques are used for applications such as surveying, engineering, mining and automation. RTK technology has been commercially available since 1993. A critical factor in RTK system performance is the initialization time and reliability of estimating the carrier phase ambiguities. The time-to-initialize governs how long the user must operate with meter-level accuracy. A system that resolves ambiguities very quickly but incorrectly has serious ramifications. There is a trade-off between initialization time and reliability. Manufacturers seek to minimize initialization time while ensuring that reliability exceeds a tolerable threshold. A system has been developed to automatically evaluate RTK initialization performance. The system consists of a network of continuously logging GPS receivers, configured over a variety of baseline lengths and multipath/obstruction scenarios. Each week data is downloaded and processed over all baselines in a real-time fashion. The same engine that is used in RTK receivers is used to process the data. In some cases, multiple RTK engines are operated for comparison purposes. Statistical summaries of the results are automatically generated and electronically distributed for review. The RTK evaluation system aids algorithm refinement and helps specify system performance for users. Results from approximately 2.5 million trials produced an average initialization time of 46 seconds, and an initialization reliability of 99.9%.
Starting Page	231
Ending Page	236
File Size	475708
Page Count	6
File Format	PDF
ISBN	0780358724
DOI	10.1109/PLANS.2000.838307
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-03-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Global Positioning System Receivers Kinematics System performance Navigation Automation Ergonomics Engines Signal processing algorithms Phase measurement
Content Type	Text
Resource Type	Article

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