Object detector which compares returned signals from successive

Details Object detector which compares returned signals from successive Object detector which compares returned signals from successive

1981-12-18

1985-04-16

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340552, 343 5PD, G08B 1316

Patent

active

045120005

ABSTRACT:
A transmitting section periodically radiates a signal wave. A receiving section receives the signal wave radiated from the transmitting section and reflected from the monitored region to produce the received signal. A sampling circuit samples the output signal from the receiving section at given time intervals. A memory stores the output signal from the sampling circuit at the time of one period of transmission, and a judging circuit compares the output signal from the sampling circuit at each transmission with the signal previously stored in the memory to detect a change in a state of an object to be detected.

REFERENCES:
patent: 4382291 (1983-05-01), Naknuchi
Skolnik, "Radar Handbook", pub. 1970, McGraw-Hill, Chapter 17 (especially sections 17.1, 17.8, 17.9, 17.10), William W. Shrader.

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