Vehicle lane changing behavior identification method and system based on expressway radar data

The invention relates to a vehicle lane changing behavior identification method and system based on expressway radar data, belongs to the technical field of vehicle lane changing identification, and solves the problems of low reliability and poor identification precision of a vehicle lane changing identification method based on radar data in the prior art. The method comprises the steps of obtaining radar data of an expressway, and generating a vehicle initial track based on the radar data; after the vehicle initial track is cleaned, matching is carried out based on an improved Frechet distance track matching algorithm, and a vehicle track is obtained; after abnormity removal and smoothing are carried out on the vehicle track, feature data are extracted, category labels are added to the feature data, sample data are obtained, and the category labels comprise lane changing or non-lane changing; training a support vector machine model based on the sample data to obtain an optimal support vector machine model; a