Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection
Patent
1955-06-27
1980-06-03
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Presence or movement only detection
367 97, 367 98, 367901, 367904, G01S 0966
Patent
active
042065100
ABSTRACT:
1. In an automatic echo ranging system wherein sonar equipment transmits ses toward a target in predetermined and equal time intervals and receives background, dopplered and undopplered echoes which are produced as video output and audio output, the improvement comprising a gain circuit for controlling the amplitude of the video and audio output, which includes a video channel for the video output of the receiver having a first variable amplifier and means for producing a first bias voltage which is proportional to the video signal voltage, an audio channel for the audio output of the receiver including a second variable amplifier and means for producing a second bias voltage which is proportional to the audio channel signal voltage, said first bias voltage from the video signal being received by said second variable amplifier in the audio channel and said second bias voltage from the audio channel being received by the first variable amplifier in the video channel, a band pass filter and a band rejection filter for the audio output from the second variable amplifier to provide an undopplered signal voltage channel and a dopplered signal voltage channel, classifier means for the dopplered channel and the undopplered channel, said classifier means including means for rectifying, and means for filtering the signals from each channel to remove high frequencies, means for passing a signal above a predetermined amplitude, a wave shaper, a differentiator for the output of the wave shaper to produce a positive and negative pulse from one echo from a target, a first rectifier and a first normally open gate for passage of the positive pulse of the one echo, a second rectifier for passing the negative pulse of the one echo, a second normally closed gate, a maximum pulse length circuit operative by the positive pulse of the one echo to open the second gate for a predetermined time to pass the negative pulse of the one echo, a minimum pulse separation circuit operative by the negative pulse of the one echo to close said first gate for a predetermined maximum range interval of the next echo from the target, a third normally closed gate, a maximum pulse separation circuit operative by the negative pulse of the first echo to open the third gate for the maximum range interval of said next echo from the target, and a relay signal circuit operated when the negative pulse of said next echo from the target passes the third gate to indicate that a target has minimum been located.
REFERENCES:
patent: 2431854 (1947-12-01), Wood
patent: 2566858 (1951-09-01), Sebring
patent: 2583531 (1952-01-01), Hathaway
patent: 2684471 (1954-07-01), Hiller
Farley Richard A.
Sciascia R. S.
Sheinbein Sol
The United States of America as represented by the Secretary of
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