SYSTEM AND METHOD FOR SINGLE-LOOP VEHICLE SPEED ESTIMATION USING INDUCTIVE LOOP SIGNATURE DATA
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United States of America Patent
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Issued Date -
Nov 19, 2020
app pub date -
Jul 31, 2020
filing date -
Dec 28, 2017
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Abstract
A system and method are disclosed for using vehicle signature data from a single inductive loop sensor to estimate vehicle speed. Two regressors are calculated from the vehicle signature: the “inverse of the duration” and the “slew rate”. A point is found by normalizing the vehicle signature in amplitude and determining the earliest point in the normalized signature to cross a set threshold. The slew rate is the slope of the normalized vehicle signature at this point. Regression models are generated from empirical data for several vehicle categories. Using the regression model for the category of vehicle and the two regressors vehicle speed is estimated. The regression models have been demonstrated to be robust eliminating the need for site-specific calibration or estimation.
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