Microwave sensor for object motion detection

Details Microwave sensor for object motion detection Microwave sensor for object motion detection

1999-02-18

2000-07-11

Gregory, Bernarr E.

Communications: directive radio wave systems and devices (e.g.,

Presence detection only

By motion detection

342 27, 342175, 342194, 342195, G01S 1356, G01S 1304

Patent

active

060879726

ABSTRACT:
A microwave sensor for determining the velocity and direction of a moving object comprises a mixer, phase shifter, and receive/transmit antenna mounted in series, the mixer having a single intermediate frequency output. The intermediate frequency output is switched synchronously with the phase shifter which is switched between 0.degree. phase shift and 45.degree. phase shift. Although the mixer has only a single intermediate frequency output, the switching provides two output channel signals and with a phase difference of 90.degree. therebetween to enable determination of the direction of movement. The single intermediate frequency channel provides intrinsic gain matching of the output channels which eliminates the need for tuning in order to balance output channels as required in conventional sensor.

REFERENCES:
patent: 4616228 (1986-10-01), Giaccari et al.

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