| 摘要 |
Cooperation between a monitored person device and a companion device allow for a relatively accurate determination of a locational reference for the monitored person device and therefore, a monitored person. This is accomplished while minimizing the weight of the monitored person device which is constantly transported by the monitored person during movement of the monitored person. The companion device may be either a fixed position type or, more preferred, a transportable type which may be moved about by the monitored person. These components of the companion device include those required to receive a signal, or signals, sufficient to allow for a determining of a locational reference of the companion device and those required to transmit a signal for eventual transfer to a central location. The monitored person device must have components which provide for transmitting a signal to the companion device, if within a communication range. Components of the system provide for a determination of a spacing and an orientation of the monitored person device relative to the companion device. When this information is combined with the information sufficient to allow for a determination of the locational reference of the companion device, the locational reference of the monitored person device may fairly accurately be made. The overall system of monitoring roaming persons may involve behavioral monitoring, medical monitoring or security monitoring.
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