DYNAMIC TESTING OF GPS RECEIVERS
Autor: | J. Vondracek, Randal K. Taylor, C. Simmelink, J. Gattis, R. Groening, J. Ney, J. Bloomfield, J. Kopriva, Ganesh C. Bora, N. Oleen, W. Burton, G. Brockmeier, B. Carlson, Mark D. Schrock |
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Rok vydání: | 2004 |
Předmět: | |
Zdroj: | ResearcherID |
ISSN: | 2151-0059 |
DOI: | 10.13031/2013.16572 |
Popis: | The popularity of GPS-based guidance systems for agriculture is increasing. However, no dynamic test standards are available to evaluate these receivers. In April 2002, GPS receivers were dynamically tested on a 0.8 km length of railroad track using a small rail cart. The track was surveyed with an RTK GPS receiver and referenced to a NGS benchmark. The GPS receivers were evaluated over a 24-hr period. The tests were conducted in both directions and at 2 different speeds. Cross-track and pass-to-pass errors were determined for a John Deere StarFire receiver with a dual frequency correction and a Trimble AgGPS132 in the autonomous mode. Cross-track errors were sequentially correlated creating problems for using typical statistical analysis methods. A Voronoi step interpolation method was used to generate evenly spaced data for Fourier analysis. Fourier analysis indicated that the cross-track errors contained significant periodic structure below 4 cycles per day. This implies that cross-track accuracy tests should be conducted for a minimum of 12-hr durations. Fourier analysis indicated that pass-to-pass errors were more random than cross-track errors, with no clear concentrations of frequency content, implying that pass-to-pass accuracy tests can yield meaningful results in less time than required for cross-track accuracy testing. |
Databáze: | OpenAIRE |
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