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It is shown that one can perform mode separation and source location using a focused horizontal array by utilizing the fact that the system response is greatest to a source located at or near the focal point. This mode separation/source location scheme is discussed for four different physical situations (1) a motionless point cw source in a range invariant environment, (2) a motionless point cw source in a range varying environment, (3) a motionless point broadband source in a range invariant environment, and (4) a moving cw source in a range invariant waveguide environment. Two types of (horizontal) arrays are treated, the line array and the convex circularly curved array. To illustrate the theory, preliminary numerical modeling results are displayed for a line array focused on a motionless point cw source in a range invariant environment.
James F. Lynch (Tue,) studied this question.