Method and apparatus for intrusion detection

Details Method and apparatus for intrusion detection Method and apparatus for intrusion detection

1982-05-03

1985-07-02

Myracle, Jerry W.

Communications: electrical

Condition responsive indicating system

Specific condition

343 5PD, 343 77, G01S 1352

Patent

active

045271518

ABSTRACT:
CW intrusion detection method and apparatus are shown comprising first and second CW Doppler radar systems which include first and second antennas, respectively. The first antenna is located adjacent ground level for illumination of a protected area adjacent the ground. The second antenna is located directly above the first antenna a spaced distance therefrom, and illuminates the same protected area adjacent the ground. In response to movement of an intruder along the ground in the protected area, first and second Doppler difference frequency signals are obtained from the first and second radar systems. Using the first and second Doppler difference frequency signals, a signal proportional to distance of the moving intruder from the first antenna is generated. Memory elements for storage of combinations of amplitude, range and/or velocity criteria signals are provided and, when the signal proportional to distance and at least one of the first and second Doppler difference frequency signals match the criteria signals, an alarm signal is produced.

REFERENCES:
patent: 3242486 (1966-03-01), Corbell
patent: 3327307 (1967-06-01), Miles
patent: 3803599 (1974-04-01), McLean et al.
patent: 3815131 (1974-06-01), Dautel et al.
patent: 3859656 (1975-01-01), Klein et al.
patent: 3967283 (1976-06-01), Clark et al.

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