Communications – electrical: acoustic wave systems and devices – Transmitter systems – With beam forming – shaping – steering – or scanning
Patent
1995-09-21
1996-06-11
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Transmitter systems
With beam forming, shaping, steering, or scanning
367103, G01S 1500
Patent
active
055263259
ABSTRACT:
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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D'Addio Raymond E.
Moorcroft Arthur L.
Sullivan Michael J.
Lall Prithvi C.
Lobo Ian J.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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