Patent ID: 7392733

Claim:
A targeting system for an underwater object comprising: a gun terminal; at least one gun barrel positioned in said gun terminal, each gun barrel terminating in a waterproof breech; at least one noise generating projectile launchable from said at least one gun barrel, said noise generating projectile comprising a bullet having at least one cavity formed therein, the cavity being formed to create a noise at a predetermined frequency in response to fluid flow over the bullet after launch of said noise generating projectile; a fire control system joined to selectively fire said at least one noise generating projectile from said at least one gun barrel; a transducer joined to receive environmental acoustic signals including noise generated by said noise generating projectile and reverberations of noise generated by said noise generating projectile; and an active sonar processor joined to said transducer for processing received environmental acoustic signals to determine the location of the object causing reverberation.