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Performance of two low-cost GPS receivers for ground speed measurement under varying speed conditions

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Abstract

A global positioning system (GPS) receiver is an important sensor used in modern farming, particularly in precision agriculture to determine geographic location and ground speed. The aim of this study was to investigate the effectiveness of two low-cost GPS receivers for measuring ground speed under varying speed conditions on four different dates. A rotary shaft encoder on an auxiliary wheel mounted on an agricultural tractor was used as a reference. A significant time lag between the rotary encoder speed and the GPS speed was found over a range of speeds. It was observed that the GPS speed lagged the encoder speed in both increasing and decreasing speeds. The average time lag was found to be between 3.6 and 5.2 s for Receiver 1 while Receiver 2 had a time lag from 1.7 to 2.5 s. A significant difference was found between the two receivers for increasing and decreasing speeds in terms of time lags (P < 0.05). A post correction by shifting the GPS speed increased the accuracy of the speed measurement capability of both receivers resulting in an average correlation coefficient of 0.30–0.90 for Receiver 1 and 0.65–0.98 for Receiver 2. Effect of USB-to-COM converter was also studied and it did not have a significant effect on time delay. The GPS receivers provided reliable data during constant speed operating conditions; however, caution should be exercised in varying speed conditions when using low-cost GPS receivers. Also, the companies that produce GPS-based speed sensors should supply technical specifications related to velocity estimates during acceleration and deceleration.

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Acknowledgments

The authors acknowledge the support of the Scientific and Technological Research Council of Turkey (TÜBİTAK) and Scientific Research Projects (BAP) Office of the Mustafa Kemal University for the financial support for the study (Project no: 1004 M 0102).

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Authors and Affiliations

  1. Department of Biosystems Engineering, Faculty of Agriculture, Mustafa Kemal University, 31040, Antakya, Hatay, Turkey

    Muharrem Keskin & Yunus Emre Sekerli

  2. Department of Metalurgy and Material Engineering, Faculty of Technology, Iskenderun Technical University, 31600, Dortyol, Hatay, Turkey

    Suleyman Kahraman

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  1. Muharrem Keskin
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  2. Yunus Emre Sekerli
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  3. Suleyman Kahraman
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Correspondence to Muharrem Keskin.

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Keskin, M., Sekerli, Y.E. & Kahraman, S. Performance of two low-cost GPS receivers for ground speed measurement under varying speed conditions. Precision Agric 18, 264–277 (2017). https://doi.org/10.1007/s11119-016-9453-x

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  • DOI: https://doi.org/10.1007/s11119-016-9453-x

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