摘要 |
<p>A fenceless animal confinement system comprising portable units (16) attached to the animal (14) and including means for receiving GPS signals (30) and for providing stimulation to the animal (14). The GPS signals are processed to provide location information which is compared to the desired boundary parameters. If the animal (14) has moved outside the desired area, the stimulation means (46) is activated. The signal processing circuitry may be included either within the portable unit (16) or within a separate fixed station (82).</p> |