G - Physics – 08 – B
Patent
G - Physics
08
B
333/96, 340/124.
G08B 13/24 (2006.01) H01Q 13/20 (2006.01)
Patent
CA 2010390
ABSTRACT OF THE DISCLOSURE An open transmission line system for locating mobile entities along a defined pathway utilizing a single open transmission line routed along the defined pathway is disclosed. In order to determine location within a length of open transmission line an electrically alterable inductance conductor is utilized as one of the transmission line conductors. The open transmission line may be a two wire line, a leaky coaxial cable or a leaky waveguide which guides an electromagnetic field along its length with a portion of the field extending into the space surrounding the transmission line. The electrically alterable inductance conductor has a helically wound conductor around a magnetically permeable core. The helically wound outer conductor is made from a number of parallel low resistance wires. The core is made from a number of very small diameter insulated high resistance wires made from magnetic material. A low frequency current passing through the outer conductor winding drives the magnetic core around its hysteresis curve thereby varying the incremental inductance of the conductor affecting the radio frequency signals propagating along the transmission line. The varying incremental inductance alters the propagation properties of the transmission line including the velocity of propagation and the radial decay rate of the external electromagnetic field. In this way the low frequency current in the variable inductance conductor modulates radio frequency signals coupling to the open transmission line. The longitudinal distance that the signal propagates along the transmission line can be determined from the phase modulation imposed by the variable inductance conductor. The radial range from the transmission line can be determined from the amplitude modulation imposed by the variable inductance conductor. The combination of phase and amplitude modulation imposed by the variable inductance conductor element of the open transmission line facilitates the location of a transmitter or receiver relative to the transmission line simultaneous with the conventional usage of the open transmission line as a means of communication. In another application the electromagnetic field of a commercial radio or TV station is used to detect and locate a target along the length of a variable velocity open transmission line. The target may, in fact, be a person and the resulting system can be used as an intrusion detector.
Adams Patent & Trademark Agency
Auratek Security Inc.
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