초록 ▼

The intrusion detection capability of a guided wave radar intrusion detection system is selectively disabled in certain areas, such as gates or portals to permit ingress and egress of personnel and vehicles without affecting overall system performance and without requiring an independent detection s

The intrusion detection capability of a guided wave radar intrusion detection system is selectively disabled in certain areas, such as gates or portals to permit ingress and egress of personnel and vehicles without affecting overall system performance and without requiring an independent detection system. This is realized by means of an integral system portal enable-disable device. Guided wave radar intrusion detection systems employ two parallel leaky transmission lines, one transmitting and the other receiving radar signals. Violation of the area between the leaky transmission lines by an intruder results in a signal that indicates the occurrence and its location. Gate areas are remotely enabled or disabled by a switching circuit that switches a segment of non-radiating transmission line into or out of the transmitting leaky transmission line in each selected gate region.

대표청구항 ▼

In a guided wave radar intrusion detection system having first and second juxtaposed leaky transmission lines with means for transmitting radar signals along said first first leaky transmission line and receiving radar signals received by said second leaky transmission line, the improvement residing

In a guided wave radar intrusion detection system having first and second juxtaposed leaky transmission lines with means for transmitting radar signals along said first first leaky transmission line and receiving radar signals received by said second leaky transmission line, the improvement residing in an integral portal intrusion detection enabling-disabling device, said portal intrusion detection enabling-disabling device comprising, at each selected portal, a segment of non-radiating transmission line traversing the portal in proximate paralled relationship to said first leaky transmission line, and a switching means for selectively switching said segment of non-radiating transmission line and a substantially equal length of said first leaky transmission line alternately into and out of said first leaky transmission line.