Coded data generation or conversion – Sample and hold
Patent
1990-03-28
1991-01-08
Shoop, Jr., William M.
Coded data generation or conversion
Sample and hold
364178, 36441325, H03M 154
Patent
active
049839705
ABSTRACT:
A method for generating a stream of digital data words, each representing an analog signal amplitude from a beam of vibratory energy received by a plurality N of transducers each associated with one of a like number of separate channels of a phased array, uses the steps of: sampling, after a delay of a multiple number of cycles at a fixed frequency F, an analog input signal in each channel at a fixed frequency F for conversion to a digital data word at each sample; then demodulating the digital data word stream in each channel to baseband and reducing the data word rate by a factor D; and phase-rotating the baseband data stream of each channel by a phase difference .DELTA..phi. determined by the focal range R and steering angle .theta. to obtain, along both the sampling delay, a different channel time delay t.sub.d,j, for each j-th channel, where 1.ltoreq.j.ltoreq.N, necessary to steer and focus the beam to a desired angle/range combination. Apparatus for generating the stream of digital data words is disclosed, and uses a special output-switching section in each channel to allow a pipelined coherent summation to be obtained across the entire phased transducer array.
REFERENCES:
patent: 4839652 (1989-06-01), O'Donnell et al.
patent: 4886069 (1989-12-01), O'Donnell et al.
patent: 4890268 (1989-12-01), Smith et al.
patent: 4896287 (1990-01-01), O'Donnell et al.
patent: 4937775 (1990-06-01), Engeler et al.
Bloomer John J.
Engeler William E.
O'Donnell Matthew
Pedicone John T.
Davis Jr. James C.
General Electric Company
Shoop Jr. William M.
Snyder Marvin
Young Brian K.
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