THRESHOLD BARRIER SYSTEM

摘要

An animal containment system is described that comprises a transmitter unit and a receiver, the transmitter unit comprising a transmitter coil and signal generator. The signal generator transmits a modulated activation signal through the coil and generates a uniform magnetic field within a region around the coil. A receiver travels through a portion of the uniform magnetic field and uses information of periodically emphasized positively directed portions of the signal to detect a first polarity of the magnetic field in a first detection area and a second reversed polarity of the magnetic field in the second detection area. A detected reversal of polarity indicates a boundary crossing event including the receiver transitioning across the boundary.

主权项

1. A system comprising:
a transmitter unit and a receiver, the transmitter unit comprising a transmitter coil, a signal generator, and a modulator; the transmitter coil comprising a wire uniformly wound around a length of a thin strip of material; placing the transmitter unit at a boundary; the signal generator generating an activation signal comprising digital data and the modulator modulating the activation signal onto carrier waves; the signal generator transmitting the modulated activation signal through the transmitter coil, the transmitting the modulated activation signal generating a uniform magnetic field within a region around the transmitter coil and defining a first detection area of the region and a second detection area of the region, the transmitting and the generating including emphasizing a first portion of the carrier waves; the receiver travelling through the region, the receiver using information of the emphasized first portion to detect a first polarity of the uniform magnetic field in the first detection area and a second polarity of the uniform magnetic field in the second detection area, the second polarity comprising a reversal of the first polarity.