Apparatus for detecting a body in motion on the ground of a prot

Details Apparatus for detecting a body in motion on the ground of a prot Apparatus for detecting a body in motion on the ground of a prot

1987-05-01

1988-12-20

Blum, Theodore M.

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

Presence detection only

342 22, 342 92, 340561, G01S 1304

Patent

active

047928042

ABSTRACT:
An apparatus for detecting bodies in motion on the ground of a protected area, particularly for military use and the like, wherein, by means of an antenna buried and shielded from the air, an electromagnetic signal in the range of radio frequency is radiated into the ground. Receiver means comprising means for detecting variations of the signal intensity are placed at a known distance from the receiving antenna. The intensity variation is dependent on the presence of bodies in motion within the range of action of the apparatus.

REFERENCES:
patent: 3794992 (1974-02-01), Gehman
patent: 3801976 (1974-04-01), Ross et al.
patent: 3947834 (1976-03-01), Gershberg et al.
patent: 4053877 (1977-10-01), Torlesse et al.
patent: 4091367 (1978-05-01), Harman
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patent: 4213123 (1980-07-01), Poirier
patent: 4346373 (1982-08-01), Hassman
patent: 4415885 (1983-11-01), Mongeon
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patent: 4527150 (1985-07-01), Porat
patent: 4562428 (1985-12-01), Harman et al.
patent: 4612536 (1986-09-01), Harman
patent: 4710753 (1987-12-01), Rich et al.
"Guidar", Control Data Corp., 12/76.
"Guidar: An Intrusion Detection System for Perimeter Protection", Harman et al; 1976.

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