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Evaluating the Dynamic Accuracy of Low-Cost GPS Receivers

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  031014,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15019) @2003
Authors:   M. Reza Ehsani, Matthew D. Sullivan, Tommy L. Zimmerman, Timothy Stombaugh
Keywords:   Yield data, Elevation data, Vertical accuracy, Precision agriculture, RTK GPS

This study introduces a method of dynamic accuracy testing for DGPS receivers and compares the dynamic accuracy of five commonly used low-cost DGPS receivers. The dynamic accuracy of five low-cost DGPS receivers (Garmin 16S, Garmin 76, Haicom HI-302, Navman 3420, Holux GM-210) were evaluated and compared while driving on a straight path under field conditions. All systems used WAAS as a source of differential signal. Cross-track error was calculated from the differences in actual position measured by a RTK GPS and position data from each DGPS receiver. Tests were conducted in N-S and E-W directions. The results indicated that the proposed method was successful in comparing the dynamic accuracy of different DGPS receivers under field conditions. The overall cross-track error was higher in the N-S direction than E-W direction for all DGPS receivers in all tests. Overall the Holux GM-210 performed the best in this study. This result is also in agreement with the static accuracy reported by each manufacturer.

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