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
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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