Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1989-07-31
1990-09-04
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367100, 367137, G01J 1500
Patent
active
049550020
ABSTRACT:
A vibratory, time variant, pseudorandom sonar system includes a computer controlled pseudorandom digital sweep frequency source, a digital/analog converter for changing the digital output of the source to an analog output and a power amplifier for amplifying the analog output to drive a vibrator or other suitable transducer for injecting corresponding sound waves into a body of water for target detection. A memory is provided for storing the source's digitized output.
A target reflects the sound waves for detection by 3 arbitrary non-colinear hydrophones which outputs a plurality of analog signals corresponding to the reflected sound waves to a plurality of channels. Each channel includes a preamplifier and an analog/digital converter for digitizing the analog electrical signals for storage in the memory. A computer controlled timer determines the time lapse between the injection of the source signal and detection of the reflected source signal by each hydrophone of the hydrophone array, for storage in memory.
A computer fetches the time lapse signals (time variant signals) and computes the bearing and range to target. The computer is attached to a crosscorrelator, an oscilloscope and a plotter. The computer fetches the digitized source and reflected signals for the crosscorrelator which acts upon the digitized signals to produce a target signature. The oscilloscope displays the target signature, and bearing and range information. While the plotter plots the target course.
REFERENCES:
patent: 2997662 (1947-07-01), Garner et al.
patent: 3958214 (1976-05-01), Andrews, Jr. et al.
patent: 4086560 (1978-04-01), Johnston et al.
patent: 4352039 (1982-09-01), Hagood et al.
Camex
Pihulic Daniel T.
Tarcza Thomas H.
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