Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1987-03-04
1988-11-15
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367900, 367909, 367 99, G01S 966
Patent
active
047854294
ABSTRACT:
A range control system positioned within a stationary housing comprising: a pulse oscillator for providing a clock signal; and a transmitter receiver circuit that directionally transmits an acoustic pulse signal to a target and receives an echo from the target to provide an amplified echo signal. A timing circuit means is included for providing a range gate signal characterized to start with each clock signal and to have a predetermined duration characterized to provide a time for the acoustic pulse to travel to the target and for the echo to return from the target. An alarm signal is provided to indicate that an echo signal is being received prior to the termination of the range gate signal. A ring blanking gate signal source provides a ring blanking gate signal commencing with each clock signal and having a duration longer than the tailoff ringing of the acoustic pulse. A diode clamp is coupled to the transducer drive circuit echo signal output. A diode bias circuit provides a predetermined time dependent uni-polar decreasing bias current to the diode clamp first terminal to bias the diode clamp to provide diminishing attenuation of the electrical echo signal with increasing time.
REFERENCES:
patent: 4197528 (1980-04-01), Gibson
patent: 4247924 (1981-01-01), Baird
patent: 4326273 (1982-04-01), Vancha
patent: 4464738 (1984-08-01), Czajkowski
patent: 4467313 (1984-08-01), Yoshimo et al.
Folwell Dale E.
Koepsell William A.
Kirk James F.
Pihulic Daniel T.
Tarcza Thomas H.
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