If that is your standard, you will forever be dissatisfied. Missles, especially the smaller ones that might be launched from a small boat, rarely have enough radar cross section to produce a radar "hit", oh you might get one every ever 10 or more sweeps if the geometry was just right, but then again you might not. They don't carry transponders either, so the only possibility would be a skin paint, and as I said, that is unlikely. Even larger missles, such as Sparrows and AMMRAAMS rarely show up on radar.