Abstract: A device for distance acquisition in a radar system, especially a tracking system, comprises a surveillance radar with a mobile directional antenna whose direction is known at each instant, a tracking unit whose line of sight is also known at each instant, and a video extractor. The device further comprises means for detecting the coincidence of the direction of the surveillance antenna with the direction of the line of sight of the tracking unit as well as means for permitting measurement of the distance of a tracked echo-emitting target by the surveillance signals at the time of such coincidence.