Portable device to assess dynamic accuracy of global positioning system (GPS) receivers used in agricultural aircraft

Steven J. Thomson, Yanbo Huang, Lowrey A. Smith

Abstract


A device was designed to test the dynamic accuracy of Global Positioning System (GPS) receivers used in agricultural aircraft and other aerial vehicles. The system works by directing a sun-reflected light beam from the ground to the aircraft using mirrors. A photo detector points downward from the aircraft to detect the light beam, and photo detection circuitry triggers an event in the guidance system data file at the aircraft’s location corresponding to the precisely georeferenced position on the ground. Construction details are presented on the mirror-based light reflection system and photo-electronic circuitry designed to trigger an event in the guidance system’s log file. An example application evaluated the horizontal accuracy of a stand-alone GPS receiver by matching dynamic data with data from the aircraft’s guidance system. Results indicated a 2.16 s lead in position registered by the stand-alone receiver over that registered by the aircraft’s guidance system GPS receiver, which had been previously evaluated to be within 0.13 s of Real-Time Kinematic (RTK)-referenced time and position.
Keywords: GPS receiver accuracy, agricultural aircraft, aerial application, remote sensing, georeferencing, UAV
DOI: 10.3965/j.ijabe.20140702.008
Citation: Thomson S J, Huang Y B, Smith L A. Portable device to assess dynamic accuracy of global positioning system (GPS) receivers used in agricultural aircraft. Int J Agric & Biol Eng, 2014; 7(2): 68－74.

Keywords


GPS receiver accuracy, agricultural aircraft, aerial application, remote sensing, georeferencing, UAV

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References


Robinson E. Aerial variable-rate applications proving their worth. Delta Farm Press, 22 April 2005 [Online]; Available: http://deltafarmpress.com/aerial-vr-applications-prove-worth. Accessed 25 February 2014, Penton Media, Inc.

Thomson S J, Huang Y B, Hanks J E, Martin D E, Smith L A. Improving flow response of a variable-rate aerial application system by interactive refinement. Computers and Electronics in Agriculture, 2010; 73(1): 99-104.

Thomson S J, Smith L A, Hanks J E. Evaluation of application accuracy and performance of a hydraulically operated variable-rate aerial application system. Transactions of the ASABE, 2009; 52(3): 715-722.

Smith L A, Thomson S J. GPS position latency determination and ground speed calibration for the Satloc® Airstar M3. Applied Engineering in Agriculture, 2005; 21(5): 769-776.

Huang Y, Thomson S J, Ortiz B V, Reddy K N, Ding W,Zablotowicz R W, et al. Airborne remote sensing assessment of the damage to cotton caused by spray drift from aerially applied glyphosate through spray deposition measurements. Biosystems Engineering, 2010; 107: 212-220.

Thomson S J, Smith L A, Sui R. Performance evaluation of low cost GPS and WAAS-corrected swathing systems on agricultural aircraft using precise position triggering. 2004; Paper no. 041062, American Society of Agricultural and Biological Engineers, St. Joseph, MI.

Sidle J G. PPS prairie dog patrol - GPS aerial surveys of dog towns. GPS World, 1999; 10(9): 30-35.

Huang Y, Thomson S J, Lan Y, Maas S J. Multispectral imaging systems for airborne remote sensing to support agricultural production management. International Journal of Agricultural and Biological Engineering, 2010; 3(1): 50-62.

Stachon W. Personal communication. 2010; Syngenta Seeds, Inc., Stanton, Minnesota.

Garmin, Inc. GPS 18X technical specifications. 2013 [Online]; Available: http://static.garmincdn.com/pumac/ GPS_18x_Tech_Specs.pdf Accessed 25 February 2014. Garmin International, Inc. Olathe, KS.




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