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Sensors 2017, 17(8), 1778;

Vehicle Speed and Length Estimation Using Data from Two Anisotropic Magneto-Resistive (AMR) Sensors

Department of Electronics Engineering, Kaunas University of Technology, Studentu St. 50–418, LT-51368 Kaunas, Lithuania
Faculty of Electrical Engineering, Bialystok University of Technology; Wiejska St. 45D, Bialystok PL-15351, Poland
Author to whom correspondence should be addressed.
Received: 21 June 2017 / Revised: 28 July 2017 / Accepted: 1 August 2017 / Published: 3 August 2017
(This article belongs to the Special Issue Magnetic Sensors and Their Applications)
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Methods for estimating a car’s length are presented in this paper, as well as the results achieved by using a self-designed system equipped with two anisotropic magneto-resistive (AMR) sensors, which were placed on a road lane. The purpose of the research was to compare the lengths of mid-size cars, i.e., family cars (hatchbacks), saloons (sedans), station wagons and SUVs. Four methods were used in the research: a simple threshold based method, a threshold method based on moving average and standard deviation, a two-extreme-peak detection method and a method based on the amplitude and time normalization using linear extrapolation (or interpolation). The results were achieved by analyzing changes in the magnitude and in the absolute z-component of the magnetic field as well. The tests, which were performed in four different Earth directions, show differences in the values of estimated lengths. The magnitude-based results in the case when cars drove from the South to the North direction were even up to 1.2 m higher than the other results achieved using the threshold methods. Smaller differences in lengths were observed when the distances were measured between two extreme peaks in the car magnetic signatures. The results were summarized in tables and the errors of estimated lengths were presented. The maximal errors, related to real lengths, were up to 22%. View Full-Text
Keywords: magnetic field; AMR sensors; vehicle speed detection; car length estimation magnetic field; AMR sensors; vehicle speed detection; car length estimation

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Markevicius, V.; Navikas, D.; Idzkowski, A.; Valinevicius, A.; Zilys, M.; Andriukaitis, D. Vehicle Speed and Length Estimation Using Data from Two Anisotropic Magneto-Resistive (AMR) Sensors. Sensors 2017, 17, 1778.

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