Moving object detecting device

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection

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340554, 343 5PD, G01S 1504

Patent

active

042875790

ABSTRACT:
A moving object detecting device employing a pair of Doppler signals as a pair of vector signals of respective received-wave signals representing momentary reflected waves from a moving object. These vector signals are processed to obtain signals denoting in which ones of predetermined zones for the vector rotation depending on the movements of the object the vector is momentarily present, and shifting states of such zone signals through the zones are traced to sequentially determine the direction and period of the vector rotation and to actuate an alarm or the like when the rotation is in a fixed direction.

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patent: 3733581 (1973-05-01), Kalmus
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patent: 3938118 (1976-02-01), Galvin et al.
patent: 3942178 (1976-03-01), Hackett
patent: 3987427 (1976-10-01), Clift
patent: 4114146 (1978-09-01), Inoue et al.

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