USA as Represented by Secretary of the Navy

Raymond E D'Addio

Michael J Sullivan

Arthur L Moorcroft

A transmitter for generating a steerable, variable frequency signal from an rray of projectors. An analog signal to be transmitted is sampled, digitized and stored in a circulating memory. A delay storage circuit includes time delays for each projector for each of predetermined beam directions. The successive locations in the recirculating memory correspond to signals having a time correspondence at predetermined unit delays from the signal then at the input terminal. The delay storage unit then produces a reading address for recovering, for each of the projector drivers, a signal value corresponding to an appropriate delay for obtaining the desired steering angle with a constant beamwidth signal. Frequency sensing circuitry can further compensate the signals by assigning each to a frequency bin and utilizing that bin to further define the delay for each projector and control the amplitude of the signal being sent to each projector. The output from a linear array of transducers is steerable over the entire range and operates with a constant band width even with significant frequency variations.

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Branford, CT, United States of America

Raymond E D'Addio