Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1981-07-30
1984-10-23
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367113, G01S 1596, G01S 762
Patent
active
044792069
ABSTRACT:
A Scanning Sonar Display System comprised of a TV monitor, a scanning mechanism with transducer, control logic with image memory and timing, a power source such as a 12 volt storage battery and a set of operator controls. The type of TV monitor used is well known and similar to those used by raster scan computer terminals. The scanning mechanism has a stepping motor with a 10 to 1 reduction cable drive system to rotate the transducer with home initializing contacts. The control logic includes two counters used as image memory address registers. The first, the refresh counter, is used for reading the image memory during refresh and for determining the horizontal and vertical sync for the TV monitor. The second, the entry counter, is used for writing sonar and depth data into the image memory and is also used for control of the stepping motor. Home initializing contacts are used to initialize this counter. The timing includes a timing ring which provides for continuous control of top delay, range, repetition rate, sonar burst width and transducer frequency. A unique feature of the timing ring is that it allows the scanning mechanism to scan at the maximum rate which is very important for this type of device. Range read out is given in a combination of numbers and dots so that the accuracy is equal to that of the resolution of the monitor.
REFERENCES:
patent: 2865014 (1958-12-01), Malm
patent: 3793619 (1974-02-01), Regis
patent: 3889225 (1975-06-01), McKenzie et al.
patent: 4104609 (1978-08-01), Minegishi et al.
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patent: 4347591 (1982-08-01), Stembridge et al.
"Electronics", Jun. 1976, pp. 127-129.
Granberg Mauritz L.
Hanson David G.
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