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Dual RTK-GPS Systems on Drainage Plows

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

Citation:  2016 10th International Drainage Symposium Conference, 6-9 September 2016, Minneapolis, Minnesota  .(doi:10.13031/IDS.20162523106)
Authors:   James L. Fouss, Bob Clark III
Keywords:   RTK, GPS, RTK-GPS Receiver, Ground-Based RTK, Drain Plow, Drain Pipe, Corrugated Plastic Pipe, Drain Grade, Grade-Control, Drain Depth, Subsurface Drainage, Grade Accuracy, Standard Deviation, Elevation, Satellite, Water Management.

Abstract. Dual RTK-GPS Systems are currently used on modern drain plows with a RTK-GPS Controlling receiver mounted on the drain plow blade for depth and grade-control, and the second RTK-GPS receiver mounted on the tractor to automatically Steer along the drain path. This paper proposes a third RTK-GPS receiver mounted on the drain pipe feeder “boot” attached behind the plow blade to Monitor & Record the depth & grade of a plastic drain pipe as it is installed. In this paper, the first and third RTK-GPS receivers are defined as a Dual RTK-GPS System to automatically Control, Monitor, and Record, depth and grade of plow-installed corrugated plastic drain pipe. The main objective of this paper is to present results and observations from a field demonstration of the Dual RTK-GPS System to evaluate its performance in meeting the intended purpose of quantifying installation accuracy of drain pipe depth & grade with a RTK-GPS controlled drain plow operating at different ground speeds. The RTK-GPS receiver mounted on the pipe-feeder “boot” Monitors & Records series of GPS coordinates, X, Y, and Zm, where Zm is the elevation of the Monitoring receiver. The recorded series of elevations (Zm) can be converted to elevations at the bottom of the “installed” drain pipe (Zd) by subtracting the height (hm) of the Monitoring receiver above the bottom of the pipe feeder “boot (Zd = Zm hm). Installation accuracy is shown graphically and quantified by statistical standard deviations of the “installed” drain depth from uniform gradient.

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