The Aspide (the Italian name of the Vipera aspis) is an Italian medium range air-to-air and surface-to-air missile produced by Selenia (now part of the Alenia consortium). It is provided with semi-active radar homing seeker. It is very similar to the American AIM-7 Sparrow, using the same airframe, but at the moment of its introduction, the Aspide was provided with monopulse guide instead of the conic scan, which made it more resistant to ECM and more precise. This innovation appeared on the Sparrows only with the late AIM-7M version. Closed-loop hydraulics were also substituted for Sparrow's open-loop type, which gave Aspide better downrange maneuverability.