| 摘要 |
A system comprised of a parent and child unit perform multiple position-dependent functions. The parent and child unit each comprises a directional antenna, power source, transceiver, processor and memory. The processor is coupled to the transceiver to control transmission and reception in each unit according to a predetermined stored protocol. The parent unit has a directional antenna and the child unit has an omnidirectional antenna. The transceivers in the units bidirectionally communicate to automatically perform one or more of the multiple position-dependent functions including electronic leash, finder, and proximity functions. Typically, a plurality of child units bidirectionally communicate with the parent unit to automatically perform the multiple position-dependent functions over a plurality of frequencies, by means of a plurality of different digital codes or both. The invention also comprises a method comprised of the steps necessary for performing the functions.
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