Ultrasonic intrusion detection system

Details Ultrasonic intrusion detection system Ultrasonic intrusion detection system

1976-01-26

1977-07-12

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

340258A, G01S 942, G01S 966, G08B 1300

Patent

active

040357988

ABSTRACT:
An ultrasonic or microwave intrusion detection system uses a modulated transmitter having one or more transducers or antennas for maintaining wave fields in the area to be protected and a receiver fed by one or more transducers or antennas which detect echo reflections of the energy from within the area. The receiver employs two mixers energized to be mixed with the echo signals and a portion of the energy from the transmitter, one of the mixers receiving such transmitter energy with 90.degree. phase shift relative to the other mixer. The outputs of the two mixers thus are in quadrature phase relative to each other and define a rotating vector which contains the information relating to the echo signals. The modulation product of these quadrature signals obtained by multiplying them together is processed continuously at the modulation frequency to obtain more reliable target information in the presence of substantially larger clutter return signals and other interference.

REFERENCES:
patent: 3696417 (1972-10-01), Pedersen
patent: 3760400 (1973-09-01), Galvin et al.
patent: 3781773 (1973-12-01), Ravas
patent: 3796989 (1974-03-01), Ravas et al.

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