Abstract:

Loop detector is one of the instruments that have been widely applied to vehicle detection. However , its accuracy is greatly affected because it fails to judge trans-line vehicles. In order to avoid the trouble , this paper analyzes the detection theory of loop detector and reveals the influence of the tested frequency on the collected data accordirig to the eddy current effect , and then deduces the data conversion formula for the tested frequencies on adjacent lanes , according to which a valuable detection method to detect trans-line vehicles is proposed based on the segmented time series pattern matching. It is proved that the presented method can effectively detect trans-line vehicles and greatly improve the accuracy and reliability of vehicle detectors.

Key words: inductive loop, trans-line vehicle, eddy current, time series pattern matching