Abstract: The invention relates to a tracking radar (17) rigidly connected to the fire tube (11) of a gun and controlling the set motors (14) of the gun in order to, after locking onto a target, cause the radar axis and thereby the axis of the fire tube (11) to follow the target. The invention the tracking radar (17) is contained in a protection envelope (20) which is fixedly mounted on the elevation system (12) of the gun and which at the front end in the fire direction is closed by a radome (21). The protection envelope (20) and radome (21) are dimensioned so as to withstand the forces arising at fire, in particular to prevent the compression waves then arising from deforming the antenna of the radar (17). The accuracy of the radar will thus be substantially maintained during firing of the gun.