Communications: electrical – Selective – Monitoring in addition to control
Patent
1974-01-10
1976-04-20
Farley, Richard A.
Communications: electrical
Selective
Monitoring in addition to control
343 5SA, G01S 966, G01S 766
Patent
active
039522806
ABSTRACT:
A technique for monitoring an object space having known cluttering objects for determining when an object of interest enters the object space. An application of the technique is in sonar supervision of a river or other body of water wherein the entrance into the monitored space by the object of interest, such as a shark or swimmer, is readily detected. Such detection is accomplished by illuminating a monitored object space with broad band radiation. Radiation either reflected from or transmitted through the object is then converted to an electrical signal that is passed through a bank of bandpass filters. The filter outputs are weighted to maximize the receiver's response to the object of interest while minimizing the response to clutter and noise. The technique is based upon the observation that different reflectors give rise to different echo spectra when the reflectors are illuminated with a broad band signal.
REFERENCES:
patent: 2368953 (1945-02-01), Walsh
patent: 3311914 (1967-03-01), Barringer
patent: 3614719 (1971-10-01), Treacy
patent: 3636562 (1972-01-01), Wehner
patent: 3716823 (1973-02-01), Thompson et al.
Faust, Geophysics, Vol. XXVIII, No. 1 Feb. 1963, pp. 1-7.
ESL Incorporated
Farley Richard A.
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