A system for indicating information related to the trajectory (58) of a projectile traveling at a supersonic velocity and intersecting a predefined target plane (56) at a point of incidence, said trajectory having an angle of incidence with said target plane, the system comprising: a plurality of acoustic sensors (38, 40) located at fixed positions in a vicinity of the target plane, wherein at least two of said locations are at different distances respectively from said plane, each sensor providing an output responsive to a shock wave generated by said projectile; and a processor (58) which determines a time- delay for each of said plurality of positions, relative to a predefined, common, reference time, based on the outputs of said sensors, and which determines at least one of said point of incidence, said angle of incidence and said supersonic velocity by at least estimating a solution to a set of time-delay equations, each equation providing an independent representation of only one of said time- delays as a function of said point of incidence, said angle of incidence and said supersonic velocity. 321 י" ג בתמוז התש" ס - July 16, 2000
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