Method and devices for identifying an object as the source of a v2x signal

A method for identifying an object as the source of a V2X signal. The method includes: receiving a V2X signal from a source by a receiver of a first vehicle; performing a relative position estimation using an environment sensor system of the first vehicle, an object from the surroundings of the first vehicle being detected, and a relative position between the first vehicle and the object being determined, the environment sensor system receiving environment signals of the object, and the object modulating the environment signals at least with a part of a V2X signal of the object; receiving the modulated environment signals by the environment sensor system of the first vehicle, and demodulating the received environment signals by the first vehicle, and ascertaining a V2X identifier of the object; comparing the V2X identifier of the object with the V2X signal of the source.