Document Detail


Portable global positioning system receivers: static validity and environmental conditions.
MedLine Citation:
PMID:  23332343     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: GPS receivers are becoming increasingly common as an objective measure of spatiotemporal movement in free-living populations; however, research into the effects of the surrounding physical environment on the accuracy of off-the-shelf GPS receivers is limited.
PURPOSE: The goal of the current study was to (1) determine the static validity of seven portable GPS receiver models under diverse environmental conditions and (2) compare the battery life and signal acquisition times among the models.
METHODS: Seven GPS models (three units of each) were placed on six geodetic sites subject to a variety of environmental conditions (e.g., open sky, high-rise buildings) on three separate occasions. The observed signal acquisition time and battery life of each unit were compared to advertised specifications. Data were collected and analyzed in June 2012.
RESULTS: Substantial variation in positional error was observed among the seven GPS models, ranging from 12.1±19.6 m to 58.8±393.2 m when averaged across the three test periods and six geodetic sites. Further, mean error varied considerably among sites: the lowest error occurred at the site under open sky (7.3±27.7 m), with the highest error at the site situated between high-rise buildings (59.2±99.2 m). While observed signal acquisition times were generally longer than advertised, the differences between observed and advertised battery life were less pronounced.
CONCLUSIONS: Results indicate that portable GPS receivers are able to accurately monitor static spatial location in unobstructed but not obstructed conditions. It also was observed that signal acquisition times were generally underestimated in advertised specifications.
Authors:
Scott Duncan; Tom I Stewart; Melody Oliver; Suzanne Mavoa; Deborah Macrae; Hannah M Badland; Mitch J Duncan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of preventive medicine     Volume:  44     ISSN:  1873-2607     ISO Abbreviation:  Am J Prev Med     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8704773     Medline TA:  Am J Prev Med     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  e19-29     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.
Affiliation:
Human Potential Centre, Auckland University of Technology, New Zealand. Electronic address: scott.duncan@aut.ac.nz.
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