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Positional accuracy of the Wide Area Augmentation System


Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/9782

Positional accuracy of the Wide Area Augmentation System

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Title: Positional accuracy of the Wide Area Augmentation System
Author: Arnold, Lisa L.
Advisor(s): Zandbergen, Paul
Committee Member(s): Matthews, Paul
Benedict, Karl
Stone, William
Department: University of New Mexico. Dept. of Geography
Subject: GPS
LC Subject(s): GPS receivers--Testing.
Mobile geographic information systems--Evaluation.
Global Positioning System.
Degree Level: Masters
Abstract: Global Positioning Systems devices are increasingly being used for data collection in many fields. Consumer-grade GPS units without differential correction have a published horizontal accuracy of approximately 10 to 15 meters (average error). An attractive option for differential correction for these GPS units is the Wide Area Augmentation System (WAAS). Most consumer-grade GPS units on the market are WAAS capable. According to the FAA, the WAAS broadcast message provides integrity information about the GPS signal as well as accuracy improvements which are reported to improve accuracy to 3 to 5 meters. However, limited empirical evidence has been published on the accuracy of WAAS-enabled GPS compared to autonomous GPS. Results are presented of an empirical study comparing the horizontal and vertical accuracy of WAAS corrected GPS and autonomous GPS under ideal conditions using consumer-grade receivers. Data were collected for thirty minute time spans over accurately surveyed control points. Metrics of median, 68th and 95th percentile, RMSE and average positional error in x, y and z were computed and statistically tested with a hypothesis test. There was no statistical difference found between WAAS and autonomous position fixes when using two different consumer-grade units. A statistical difference was evident in a third unit type tested. Analysis of data collected for a twenty seven hour time span indicates that while WAAS is altering the estimated position of a point compared to autonomous position estimate, WAAS augmentation actually appears to increase the positional error.
Graduation Date: July 2009
URI: http://hdl.handle.net/1928/9782

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